http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/flink/src/test/java/org/apache/zeppelin/flink/FlinkSQLInterpreterTest.java
----------------------------------------------------------------------
diff --git 
a/flink/src/test/java/org/apache/zeppelin/flink/FlinkSQLInterpreterTest.java 
b/flink/src/test/java/org/apache/zeppelin/flink/FlinkSQLInterpreterTest.java
index 592ad36..6993540 100644
--- a/flink/src/test/java/org/apache/zeppelin/flink/FlinkSQLInterpreterTest.java
+++ b/flink/src/test/java/org/apache/zeppelin/flink/FlinkSQLInterpreterTest.java
@@ -17,10 +17,6 @@
 
 package org.apache.zeppelin.flink;
 
-import static org.junit.Assert.assertEquals;
-
-import java.io.IOException;
-import java.util.Properties;
 import org.apache.zeppelin.display.AngularObjectRegistry;
 import org.apache.zeppelin.interpreter.InterpreterContext;
 import org.apache.zeppelin.interpreter.InterpreterException;
@@ -32,6 +28,11 @@ import 
org.apache.zeppelin.interpreter.InterpreterResultMessageOutput;
 import org.junit.Before;
 import org.junit.Test;
 
+import java.io.IOException;
+import java.util.Properties;
+
+import static org.junit.Assert.assertEquals;
+
 public class FlinkSQLInterpreterTest {
 
   private FlinkInterpreter interpreter;
@@ -61,48 +62,49 @@ public class FlinkSQLInterpreterTest {
 
   @Test
   public void testSQLInterpreter() throws InterpreterException {
-    InterpreterResult result =
-        interpreter.interpret(
-            "val ds = benv.fromElements((1, \"jeff\"), (2, \"andy\"))", 
getInterpreterContext());
+    InterpreterResult result = interpreter.interpret(
+        "val ds = benv.fromElements((1, \"jeff\"), (2, \"andy\"))", 
getInterpreterContext());
     assertEquals(InterpreterResult.Code.SUCCESS, result.code());
 
-    result =
-        interpreter.interpret("btenv.registerDataSet(\"table_1\", ds)", 
getInterpreterContext());
+    result = interpreter.interpret("btenv.registerDataSet(\"table_1\", ds)",
+        getInterpreterContext());
     assertEquals(InterpreterResult.Code.SUCCESS, result.code());
 
     result = sqlInterpreter.interpret("select * from table_1", 
getInterpreterContext());
     assertEquals(InterpreterResult.Code.SUCCESS, result.code());
     assertEquals(InterpreterResult.Type.TABLE, 
result.message().get(0).getType());
-    assertEquals("_1\t_2\n" + "1\tjeff\n" + "2\tandy\n", 
result.message().get(0).getData());
+    assertEquals("_1\t_2\n" +
+        "1\tjeff\n" +
+        "2\tandy\n", result.message().get(0).getData());
   }
 
   private InterpreterContext getInterpreterContext() {
     output = "";
-    InterpreterContext context =
-        InterpreterContext.builder()
-            .setInterpreterOut(new InterpreterOutput(null))
-            .setAngularObjectRegistry(new AngularObjectRegistry("flink", null))
-            .build();
-    context.out =
-        new InterpreterOutput(
-            new InterpreterOutputListener() {
-              @Override
-              public void onUpdateAll(InterpreterOutput out) {}
-
-              @Override
-              public void onAppend(int index, InterpreterResultMessageOutput 
out, byte[] line) {
-                try {
-                  output = out.toInterpreterResultMessage().getData();
-                } catch (IOException e) {
-                  e.printStackTrace();
-                }
-              }
-
-              @Override
-              public void onUpdate(int index, InterpreterResultMessageOutput 
out) {
-                messageOutput = out;
-              }
-            });
+    InterpreterContext context = InterpreterContext.builder()
+        .setInterpreterOut(new InterpreterOutput(null))
+        .setAngularObjectRegistry(new AngularObjectRegistry("flink", null))
+        .build();
+    context.out = new InterpreterOutput(
+        new InterpreterOutputListener() {
+          @Override
+          public void onUpdateAll(InterpreterOutput out) {
+
+          }
+
+          @Override
+          public void onAppend(int index, InterpreterResultMessageOutput out, 
byte[] line) {
+            try {
+              output = out.toInterpreterResultMessage().getData();
+            } catch (IOException e) {
+              e.printStackTrace();
+            }
+          }
+
+          @Override
+          public void onUpdate(int index, InterpreterResultMessageOutput out) {
+            messageOutput = out;
+          }
+        });
     return context;
   }
 }

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/geode/pom.xml
----------------------------------------------------------------------
diff --git a/geode/pom.xml b/geode/pom.xml
index d2adaad..5e354ae 100644
--- a/geode/pom.xml
+++ b/geode/pom.xml
@@ -95,6 +95,13 @@
       <plugin>
         <artifactId>maven-resources-plugin</artifactId>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-checkstyle-plugin</artifactId>
+        <configuration>
+          <skip>false</skip>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
 </project>

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/geode/src/main/java/org/apache/zeppelin/geode/GeodeOqlInterpreter.java
----------------------------------------------------------------------
diff --git 
a/geode/src/main/java/org/apache/zeppelin/geode/GeodeOqlInterpreter.java 
b/geode/src/main/java/org/apache/zeppelin/geode/GeodeOqlInterpreter.java
index 3a013bb..638a9f3 100644
--- a/geode/src/main/java/org/apache/zeppelin/geode/GeodeOqlInterpreter.java
+++ b/geode/src/main/java/org/apache/zeppelin/geode/GeodeOqlInterpreter.java
@@ -4,19 +4,16 @@
  * copyright ownership. The ASF licenses this file to you under the Apache 
License, Version 2.0 (the
  * "License"); you may not use this file except in compliance with the 
License. You may obtain a
  * copy of the License at
- *
- * <p>http://www.apache.org/licenses/LICENSE-2.0
- *
- * <p>Unless required by applicable law or agreed to in writing, software 
distributed under the
- * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR 
CONDITIONS OF ANY KIND, either
- * express or implied. See the License for the specific language governing 
permissions and
- * limitations under the License.
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
  */
 package org.apache.zeppelin.geode;
 
-import java.util.Iterator;
-import java.util.List;
-import java.util.Properties;
 import org.apache.commons.lang.StringUtils;
 import org.apache.geode.cache.client.ClientCache;
 import org.apache.geode.cache.client.ClientCacheFactory;
@@ -34,36 +31,55 @@ import org.apache.zeppelin.scheduler.SchedulerFactory;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.util.Iterator;
+import java.util.List;
+import java.util.Properties;
+
 /**
  * Apache Geode OQL Interpreter (http://geode.apache.org)
  *
  * <ul>
- *   <li>{@code geode.locator.host} - The Geode Locator {@code <HOST>} to 
connect to.
- *   <li>{@code geode.locator.port} - The Geode Locator {@code <PORT>} to 
connect to.
- *   <li>{@code geode.max.result} - Max number of OQL result to display.
+ * <li>{@code geode.locator.host} - The Geode Locator {@code <HOST>} to 
connect to.</li>
+ * <li>{@code geode.locator.port} - The Geode Locator {@code <PORT>} to 
connect to.</li>
+ * <li>{@code geode.max.result} - Max number of OQL result to display.</li>
  * </ul>
- *
- * <p>Sample usages: <br>
- * {@code %geode.oql} <br>
- * {@code SELECT * FROM /regionEmployee e WHERE e.companyId > 95} <br>
- * {@code SELECT * FROM /regionEmployee ORDER BY employeeId} <br>
- * {@code SELECT * FROM /regionEmployee WHERE companyId IN SET(1, 3, 7) OR 
lastName IN SET('NameA',
- * 'NameB') } <br>
- * {@code SELECT e.employeeId, c.id as companyId FROM /regionEmployee e, 
/regionCompany c WHERE
- * e.companyId = c.id }
- *
- * <p>OQL specification and sample queries:
+ * <p>
+ * Sample usages: <br/>
+ * {@code %geode.oql} <br/>
+ * {@code SELECT * FROM /regionEmployee e WHERE e.companyId > 95} <br/>
+ * {@code SELECT * FROM /regionEmployee ORDER BY employeeId} <br/>
+ * {@code
+ * SELECT * FROM /regionEmployee
+ * WHERE companyId IN SET(1, 3, 7) OR lastName IN SET('NameA', 'NameB')
+ * } <br/>
+ * {@code
+ * SELECT e.employeeId, c.id as companyId FROM /regionEmployee e, 
/regionCompany c
+ * WHERE e.companyId = c.id
+ * }
+ * </p>
+ * <p>
+ * OQL specification and sample queries:
  * 
http://geode-docs.cfapps.io/docs/getting_started/querying_quick_reference.html
- *
- * <p>When the Zeppelin server is collocated with Geode Shell (gfsh) one can 
use the %sh interpreter
- * to run Geode shell commands: <br>
- * {@code %sh source /etc/geode/conf/geode-env.sh gfsh << EOF connect
- * --locator=ambari.localdomain[10334] destroy region --name=/regionEmployee 
create region
- * --name=regionEmployee --type=REPLICATE exit; EOF }
- *
- * <p>Known 
issue:http://gemfire.docs.pivotal.io/bugnotes/KnownIssuesGemFire810.html #43673 
Using
- * query "select * from /exampleRegion.entrySet" fails in a client-server 
topology and/or in a
+ * </p>
+ * <p>
+ * When the Zeppelin server is collocated with Geode Shell (gfsh) one can use 
the %sh interpreter to
+ * run Geode shell commands: <br/>
+ * {@code
+ * %sh
+ *  source /etc/geode/conf/geode-env.sh
+ *  gfsh << EOF
+ *    connect --locator=ambari.localdomain[10334]
+ *    destroy region --name=/regionEmployee
+ *    create region --name=regionEmployee --type=REPLICATE
+ *    exit;
+ *  EOF
+ *}
+ * </p>
+ * <p>
+ * Known 
issue:http://gemfire.docs.pivotal.io/bugnotes/KnownIssuesGemFire810.html #43673 
Using query
+ * "select * from /exampleRegion.entrySet" fails in a client-server topology 
and/or in a
  * PartitionedRegion.
+ * </p>
  */
 public class GeodeOqlInterpreter extends Interpreter {
 
@@ -236,6 +252,7 @@ public class GeodeOqlInterpreter extends Interpreter {
     msg.append("" + entry);
   }
 
+
   @Override
   public InterpreterResult interpret(String cmd, InterpreterContext 
contextInterpreter) {
     logger.info("Run OQL command '{}'", cmd);
@@ -259,13 +276,13 @@ public class GeodeOqlInterpreter extends Interpreter {
 
   @Override
   public Scheduler getScheduler() {
-    return SchedulerFactory.singleton()
-        .createOrGetFIFOScheduler(GeodeOqlInterpreter.class.getName() + 
this.hashCode());
+    return SchedulerFactory.singleton().createOrGetFIFOScheduler(
+        GeodeOqlInterpreter.class.getName() + this.hashCode());
   }
 
   @Override
-  public List<InterpreterCompletion> completion(
-      String buf, int cursor, InterpreterContext interpreterContext) {
+  public List<InterpreterCompletion> completion(String buf, int cursor,
+                                                InterpreterContext 
interpreterContext) {
     return null;
   }
 

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/geode/src/test/java/org/apache/zeppelin/geode/GeodeOqlInterpreterTest.java
----------------------------------------------------------------------
diff --git 
a/geode/src/test/java/org/apache/zeppelin/geode/GeodeOqlInterpreterTest.java 
b/geode/src/test/java/org/apache/zeppelin/geode/GeodeOqlInterpreterTest.java
index 38d9e30..4404863 100644
--- a/geode/src/test/java/org/apache/zeppelin/geode/GeodeOqlInterpreterTest.java
+++ b/geode/src/test/java/org/apache/zeppelin/geode/GeodeOqlInterpreterTest.java
@@ -4,31 +4,16 @@
  * copyright ownership. The ASF licenses this file to you under the Apache 
License, Version 2.0 (the
  * "License"); you may not use this file except in compliance with the 
License. You may obtain a
  * copy of the License at
- *
- * <p>http://www.apache.org/licenses/LICENSE-2.0
- *
- * <p>Unless required by applicable law or agreed to in writing, software 
distributed under the
- * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR 
CONDITIONS OF ANY KIND, either
- * express or implied. See the License for the specific language governing 
permissions and
- * limitations under the License.
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
  */
 package org.apache.zeppelin.geode;
 
-import static org.junit.Assert.assertEquals;
-import static org.mockito.Matchers.eq;
-import static org.mockito.Mockito.RETURNS_DEEP_STUBS;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.spy;
-import static org.mockito.Mockito.times;
-import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
-
-import java.io.ByteArrayInputStream;
-import java.io.DataInputStream;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Iterator;
-import java.util.Properties;
 import org.apache.geode.cache.query.QueryService;
 import org.apache.geode.cache.query.SelectResults;
 import org.apache.geode.cache.query.Struct;
@@ -42,6 +27,22 @@ import org.apache.zeppelin.interpreter.InterpreterResult;
 import org.apache.zeppelin.interpreter.InterpreterResult.Code;
 import org.junit.Test;
 
+import java.io.ByteArrayInputStream;
+import java.io.DataInputStream;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.Properties;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.RETURNS_DEEP_STUBS;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
 public class GeodeOqlInterpreterTest {
 
   private static final String OQL_QUERY = "select * from /region";
@@ -77,9 +78,9 @@ public class GeodeOqlInterpreterTest {
 
   @Test
   public void oqlStructResponse() throws Exception {
-    String[] fields = new String[] {"field1", "field2"};
-    Struct s1 = new StructImpl(new StructTypeImpl(fields), new String[] 
{"val11", "val12"});
-    Struct s2 = new StructImpl(new StructTypeImpl(fields), new String[] 
{"val21", "val22"});
+    String[] fields = new String[]{"field1", "field2"};
+    Struct s1 = new StructImpl(new StructTypeImpl(fields), new 
String[]{"val11", "val12"});
+    Struct s2 = new StructImpl(new StructTypeImpl(fields), new 
String[]{"val21", "val22"});
 
     testOql(asIterator(s1, s2), 
"field1\tfield2\t\nval11\tval12\t\nval21\tval22\t\n", 10);
     testOql(asIterator(s1, s2), "field1\tfield2\t\nval11\tval12\t\n", 1);
@@ -87,8 +88,8 @@ public class GeodeOqlInterpreterTest {
 
   @Test
   public void oqlStructResponseWithReservedCharacters() throws Exception {
-    String[] fields = new String[] {"fi\teld1", "f\nield2"};
-    Struct s1 = new StructImpl(new StructTypeImpl(fields), new String[] 
{"v\nal\t1", "val2"});
+    String[] fields = new String[]{"fi\teld1", "f\nield2"};
+    Struct s1 = new StructImpl(new StructTypeImpl(fields), new 
String[]{"v\nal\t1", "val2"});
 
     testOql(asIterator(s1), "fi eld1\tf ield2\t\nv al 1\tval2\t\n", 10);
   }
@@ -115,10 +116,8 @@ public class GeodeOqlInterpreterTest {
     DummyUnspportedType unspported1 = new DummyUnspportedType();
     DummyUnspportedType unspported2 = new DummyUnspportedType();
 
-    testOql(
-        asIterator(unspported1, unspported2),
-        "Unsuppoted Type\n" + unspported1.toString() + "\n" + 
unspported1.toString() + "\n",
-        10);
+    testOql(asIterator(unspported1, unspported2), "Unsuppoted Type\n" + 
unspported1.toString()
+        + "\n" + unspported1.toString() + "\n", 10);
   }
 
   private void testOql(Iterator<Object> queryResponseIterator, String 
expectedOutput, int maxResult)
@@ -149,8 +148,8 @@ public class GeodeOqlInterpreterTest {
 
     GeodeOqlInterpreter spyGeodeOqlInterpreter = spy(new 
GeodeOqlInterpreter(new Properties()));
 
-    when(spyGeodeOqlInterpreter.getExceptionOnConnect())
-        .thenReturn(new RuntimeException("Test Exception On Connect"));
+    when(spyGeodeOqlInterpreter.getExceptionOnConnect()).thenReturn(
+        new RuntimeException("Test Exception On Connect"));
 
     InterpreterResult interpreterResult = 
spyGeodeOqlInterpreter.interpret(OQL_QUERY, null);
 
@@ -163,8 +162,8 @@ public class GeodeOqlInterpreterTest {
 
     GeodeOqlInterpreter spyGeodeOqlInterpreter = spy(new 
GeodeOqlInterpreter(new Properties()));
 
-    when(spyGeodeOqlInterpreter.getQueryService())
-        .thenThrow(new RuntimeException("Expected Test Exception!"));
+    when(spyGeodeOqlInterpreter.getQueryService()).thenThrow(
+        new RuntimeException("Expected Test Exception!"));
 
     InterpreterResult interpreterResult = 
spyGeodeOqlInterpreter.interpret(OQL_QUERY, null);
 

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/groovy/pom-groovy-only.xml
----------------------------------------------------------------------
diff --git a/groovy/pom-groovy-only.xml b/groovy/pom-groovy-only.xml
index 78fff94..971c674 100644
--- a/groovy/pom-groovy-only.xml
+++ b/groovy/pom-groovy-only.xml
@@ -79,6 +79,17 @@
           </compilerArgs>
         </configuration>
       </plugin>
+ 
+      <!--TODO: comment local `maven-checkstyle-plugin` and use zeppelin 
common check style-->
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-checkstyle-plugin</artifactId>
+        <configuration>
+          <skip>true</skip>
+        </configuration>
+        <executions>
+        </executions>
+      </plugin>
       <plugin>
         <artifactId>maven-enforcer-plugin</artifactId>
         <version>1.3.1</version>            

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/groovy/pom.xml
----------------------------------------------------------------------
diff --git a/groovy/pom.xml b/groovy/pom.xml
index 8de3365..9b95fc3 100644
--- a/groovy/pom.xml
+++ b/groovy/pom.xml
@@ -80,6 +80,13 @@
       <plugin>
         <artifactId>maven-resources-plugin</artifactId>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-checkstyle-plugin</artifactId>
+        <configuration>
+          <skip>false</skip>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
 

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/groovy/src/main/java/org/apache/zeppelin/groovy/GObject.java
----------------------------------------------------------------------
diff --git a/groovy/src/main/java/org/apache/zeppelin/groovy/GObject.java 
b/groovy/src/main/java/org/apache/zeppelin/groovy/GObject.java
index de898cd..e7f27c3 100644
--- a/groovy/src/main/java/org/apache/zeppelin/groovy/GObject.java
+++ b/groovy/src/main/java/org/apache/zeppelin/groovy/GObject.java
@@ -18,12 +18,6 @@ package org.apache.zeppelin.groovy;
 
 import groovy.lang.Closure;
 import groovy.xml.MarkupBuilder;
-import java.io.IOException;
-import java.io.StringWriter;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Map;
-import java.util.Properties;
 import org.apache.thrift.TException;
 import org.apache.zeppelin.annotation.ZeppelinApi;
 import org.apache.zeppelin.display.AngularObject;
@@ -33,7 +27,16 @@ import 
org.apache.zeppelin.display.ui.OptionInput.ParamOption;
 import org.apache.zeppelin.interpreter.InterpreterContext;
 import org.slf4j.Logger;
 
-/** Groovy interpreter for Zeppelin. */
+import java.io.IOException;
+import java.io.StringWriter;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Map;
+import java.util.Properties;
+
+/**
+ * Groovy interpreter for Zeppelin.
+ */
 public class GObject extends groovy.lang.GroovyObjectSupport {
   Logger log;
   StringWriter out;
@@ -42,11 +45,7 @@ public class GObject extends groovy.lang.GroovyObjectSupport 
{
   Map<String, Object> bindings;
   GroovyZeppelinContext z;
 
-  public GObject(
-      Logger log,
-      StringWriter out,
-      Properties p,
-      InterpreterContext ctx,
+  public GObject(Logger log, StringWriter out, Properties p, 
InterpreterContext ctx,
       Map<String, Object> bindings) {
     this.log = log;
     this.out = out;
@@ -84,7 +83,9 @@ public class GObject extends groovy.lang.GroovyObjectSupport {
     }
   }
 
-  /** returns gui object. */
+  /**
+   * returns gui object.
+   */
   public GUI getGui() {
     return z.getGui();
   }
@@ -124,11 +125,12 @@ public class GObject extends 
groovy.lang.GroovyObjectSupport {
   }
 
   @ZeppelinApi
-  public Collection<Object> checkbox(
-      String name, Collection<Object> defaultChecked, Map<Object, String> 
options) {
+  public Collection<Object> checkbox(String name, Collection<Object> 
defaultChecked,
+      Map<Object, String> options) {
     return z.checkbox(name, new ArrayList<Object>(defaultChecked), 
toParamOptions(options));
   }
 
+
   /**
    * Returns shared variable if it was previously set. The same as getting 
groovy script variables
    * but this method will return null if script variable not assigned. To 
understand groovy script
@@ -153,9 +155,9 @@ public class GObject extends 
groovy.lang.GroovyObjectSupport {
   }
 
   /**
-   * Sets a new value to interpreter's shared variables. Could be set by <code>
-   * put('varName', newValue )</code> or by just assigning <code>varName = 
value</code> without
-   * declaring a variable.
+   * Sets a new value to interpreter's shared variables.
+   * Could be set by <code>put('varName', newValue )</code>
+   * or by just assigning <code>varName = value</code> without declaring a 
variable.
    */
   public Object put(String varName, Object newValue) {
     return bindings.put(varName, newValue);
@@ -163,7 +165,6 @@ public class GObject extends 
groovy.lang.GroovyObjectSupport {
 
   /**
    * starts or continues rendering html/angular and returns MarkupBuilder to 
build html.
-   *
    * <pre> g.html().with{
    *  h1("hello")
    *  h2("world")
@@ -186,7 +187,7 @@ public class GObject extends 
groovy.lang.GroovyObjectSupport {
     StringBuffer sb = out.getBuffer();
     startOutputType("%table");
     if (obj instanceof groovy.lang.Closure) {
-      // if closure run and get result collection
+      //if closure run and get result collection
       obj = ((Closure) obj).call();
     }
     if (obj instanceof Collection) {
@@ -244,8 +245,8 @@ public class GObject extends 
groovy.lang.GroovyObjectSupport {
   }
 
   /**
-   * Create angular variable in notebook scope and bind with front end Angular 
display system. If
-   * variable exists, it'll be overwritten.
+   * Create angular variable in notebook scope and bind with front end Angular 
display system.
+   * If variable exists, it'll be overwritten.
    *
    * @param name name of the variable
    * @param o value
@@ -254,19 +255,25 @@ public class GObject extends 
groovy.lang.GroovyObjectSupport {
     angularBind(name, o, interpreterContext.getNoteId());
   }
 
-  /** Run paragraph by id. */
+  /**
+   * Run paragraph by id.
+   */
   @ZeppelinApi
   public void run(String noteId, String paragraphId) throws IOException {
     z.run(noteId, paragraphId);
   }
 
-  /** Run paragraph by id. */
+  /**
+   * Run paragraph by id.
+   */
   @ZeppelinApi
   public void run(String paragraphId) throws IOException {
     z.run(paragraphId);
   }
 
-  /** Run paragraph by id. */
+  /**
+   * Run paragraph by id.
+   */
   @ZeppelinApi
   public void run(String noteId, String paragraphId, InterpreterContext 
context)
       throws IOException {
@@ -281,13 +288,17 @@ public class GObject extends 
groovy.lang.GroovyObjectSupport {
     z.runNote(noteId, context);
   }
 
-  /** Run all paragraphs. except this. */
+  /**
+   * Run all paragraphs. except this.
+   */
   @ZeppelinApi
   public void runAll() throws IOException {
     z.runAll(interpreterContext);
   }
 
-  /** Run all paragraphs. except this. */
+  /**
+   * Run all paragraphs. except this.
+   */
   @ZeppelinApi
   public void runAll(InterpreterContext context) throws IOException {
     z.runNote(context.getNoteId());

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/groovy/src/main/java/org/apache/zeppelin/groovy/GroovyInterpreter.java
----------------------------------------------------------------------
diff --git 
a/groovy/src/main/java/org/apache/zeppelin/groovy/GroovyInterpreter.java 
b/groovy/src/main/java/org/apache/zeppelin/groovy/GroovyInterpreter.java
index 26f812b..607a6d5 100644
--- a/groovy/src/main/java/org/apache/zeppelin/groovy/GroovyInterpreter.java
+++ b/groovy/src/main/java/org/apache/zeppelin/groovy/GroovyInterpreter.java
@@ -17,8 +17,12 @@
 
 package org.apache.zeppelin.groovy;
 
-import groovy.lang.GroovyShell;
-import groovy.lang.Script;
+import org.codehaus.groovy.control.CompilerConfiguration;
+import org.codehaus.groovy.runtime.StackTraceUtils;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.io.File;
 import java.io.PrintWriter;
 import java.io.StringWriter;
@@ -31,6 +35,10 @@ import java.util.Properties;
 import java.util.Set;
 import java.util.WeakHashMap;
 import java.util.concurrent.ConcurrentHashMap;
+
+import groovy.lang.GroovyShell;
+import groovy.lang.Script;
+
 import org.apache.zeppelin.interpreter.Interpreter;
 import org.apache.zeppelin.interpreter.InterpreterContext;
 import org.apache.zeppelin.interpreter.InterpreterResult;
@@ -39,20 +47,18 @@ import 
org.apache.zeppelin.interpreter.thrift.InterpreterCompletion;
 import org.apache.zeppelin.scheduler.Job;
 import org.apache.zeppelin.scheduler.Scheduler;
 import org.apache.zeppelin.scheduler.SchedulerFactory;
-import org.codehaus.groovy.control.CompilerConfiguration;
-import org.codehaus.groovy.runtime.StackTraceUtils;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
-/** Groovy interpreter for Zeppelin. */
+/**
+ * Groovy interpreter for Zeppelin.
+ */
 public class GroovyInterpreter extends Interpreter {
   Logger log = LoggerFactory.getLogger(GroovyInterpreter.class);
-  GroovyShell shell = null; // new GroovyShell();
-  // here we will store Interpreters shared variables. concurrent just in case.
+  GroovyShell shell = null; //new GroovyShell();
+  //here we will store Interpreters shared variables. concurrent just in case.
   Map<String, Object> sharedBindings = new ConcurrentHashMap<String, Object>();
-  // cache for groovy compiled scripts
-  Map<String, Class<Script>> scriptCache =
-      Collections.synchronizedMap(new WeakHashMap<String, Class<Script>>(100));
+  //cache for groovy compiled scripts
+  Map<String, Class<Script>> scriptCache = Collections
+      .synchronizedMap(new WeakHashMap<String, Class<Script>>(100));
 
   public GroovyInterpreter(Properties property) {
     super(property);
@@ -66,14 +72,9 @@ public class GroovyInterpreter extends Interpreter {
     String classes = getProperty("GROOVY_CLASSES");
     if (classes == null || classes.length() == 0) {
       try {
-        File jar =
-            new File(
-                GroovyInterpreter.class
-                    .getProtectionDomain()
-                    .getCodeSource()
-                    .getLocation()
-                    .toURI()
-                    .getPath());
+        File jar = new File(
+            
GroovyInterpreter.class.getProtectionDomain().getCodeSource().getLocation().toURI()
+                .getPath());
         classes = new File(jar.getParentFile(), "classes").toString();
       } catch (Exception e) {
         log.error(e.getMessage());
@@ -122,8 +123,8 @@ public class GroovyInterpreter extends Interpreter {
   }
 
   @Override
-  public List<InterpreterCompletion> completion(
-      String buf, int cursor, InterpreterContext interpreterContext) {
+  public List<InterpreterCompletion> completion(String buf, int cursor,
+                                                InterpreterContext 
interpreterContext) {
     return null;
   }
 
@@ -160,24 +161,23 @@ public class GroovyInterpreter extends Interpreter {
     try {
       Script script = getGroovyScript(contextInterpreter.getParagraphId(), 
cmd);
       Job runningJob = getRunningJob(contextInterpreter.getParagraphId());
-      runningJob
-          .info()
-          .put("CURRENT_THREAD", Thread.currentThread()); // to be able to 
terminate thread
+      runningJob.info()
+          .put("CURRENT_THREAD", Thread.currentThread()); //to be able to 
terminate thread
       Map<String, Object> bindings = script.getBinding().getVariables();
       bindings.clear();
       StringWriter out = new StringWriter((int) (cmd.length() * 1.75));
-      // put shared bindings evaluated in this interpreter
+      //put shared bindings evaluated in this interpreter
       bindings.putAll(sharedBindings);
-      // put predefined bindings
+      //put predefined bindings
       bindings.put("g", new GObject(log, out, this.getProperties(), 
contextInterpreter, bindings));
       bindings.put("out", new PrintWriter(out, true));
 
       script.run();
-      // let's get shared variables defined in current script and store them 
in shared map
+      //let's get shared variables defined in current script and store them in 
shared map
       for (Map.Entry<String, Object> e : bindings.entrySet()) {
         if (!predefinedBindings.contains(e.getKey())) {
           if (log.isTraceEnabled()) {
-            log.trace("groovy script variable " + e); // let's see what we 
have...
+            log.trace("groovy script variable " + e);  //let's see what we 
have...
           }
           sharedBindings.put(e.getKey(), e.getValue());
         }
@@ -205,7 +205,7 @@ public class GroovyInterpreter extends Interpreter {
           Thread t = (Thread) object;
           t.dumpStack();
           t.interrupt();
-          // t.stop(); //TODO(dlukyanov): need some way to terminate maybe 
through GObject..
+          //t.stop(); //TODO(dlukyanov): need some way to terminate maybe 
through GObject..
         } catch (Throwable t) {
           log.error("Failed to cancel script: " + t, t);
         }

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/groovy/src/main/java/org/apache/zeppelin/groovy/GroovyZeppelinContext.java
----------------------------------------------------------------------
diff --git 
a/groovy/src/main/java/org/apache/zeppelin/groovy/GroovyZeppelinContext.java 
b/groovy/src/main/java/org/apache/zeppelin/groovy/GroovyZeppelinContext.java
index 2016d3d..3d17462 100644
--- a/groovy/src/main/java/org/apache/zeppelin/groovy/GroovyZeppelinContext.java
+++ b/groovy/src/main/java/org/apache/zeppelin/groovy/GroovyZeppelinContext.java
@@ -17,12 +17,15 @@
 
 package org.apache.zeppelin.groovy;
 
-import java.util.List;
-import java.util.Map;
 import org.apache.zeppelin.interpreter.BaseZeppelinContext;
 import org.apache.zeppelin.interpreter.InterpreterHookRegistry;
 
-/** ZeppelinContext for Groovy */
+import java.util.List;
+import java.util.Map;
+
+/**
+ * ZeppelinContext for Groovy
+ */
 public class GroovyZeppelinContext extends BaseZeppelinContext {
 
   public GroovyZeppelinContext(InterpreterHookRegistry hooks, int maxResult) {

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/hbase/pom.xml
----------------------------------------------------------------------
diff --git a/hbase/pom.xml b/hbase/pom.xml
index 46886fd..f189c07 100644
--- a/hbase/pom.xml
+++ b/hbase/pom.xml
@@ -124,6 +124,13 @@
       <plugin>
         <artifactId>maven-resources-plugin</artifactId>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-checkstyle-plugin</artifactId>
+        <configuration>
+          <skip>false</skip>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
 

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/hbase/src/main/java/org/apache/zeppelin/hbase/HbaseInterpreter.java
----------------------------------------------------------------------
diff --git 
a/hbase/src/main/java/org/apache/zeppelin/hbase/HbaseInterpreter.java 
b/hbase/src/main/java/org/apache/zeppelin/hbase/HbaseInterpreter.java
index 9c92cc5..adddacf 100644
--- a/hbase/src/main/java/org/apache/zeppelin/hbase/HbaseInterpreter.java
+++ b/hbase/src/main/java/org/apache/zeppelin/hbase/HbaseInterpreter.java
@@ -14,6 +14,11 @@
 
 package org.apache.zeppelin.hbase;
 
+import org.jruby.embed.LocalContextScope;
+import org.jruby.embed.ScriptingContainer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
@@ -22,6 +27,7 @@ import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.List;
 import java.util.Properties;
+
 import org.apache.zeppelin.interpreter.Interpreter;
 import org.apache.zeppelin.interpreter.InterpreterContext;
 import org.apache.zeppelin.interpreter.InterpreterException;
@@ -29,25 +35,22 @@ import org.apache.zeppelin.interpreter.InterpreterResult;
 import org.apache.zeppelin.interpreter.thrift.InterpreterCompletion;
 import org.apache.zeppelin.scheduler.Scheduler;
 import org.apache.zeppelin.scheduler.SchedulerFactory;
-import org.jruby.embed.LocalContextScope;
-import org.jruby.embed.ScriptingContainer;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 /**
- * Support for HBase Shell. All the commands documented here 
http://hbase.apache.org/book.html#shell
- * is supported.
+ * Support for HBase Shell. All the commands documented here
+ * http://hbase.apache.org/book.html#shell is supported.
  *
- * <p>Requirements: HBase Shell should be installed on the same machine. To be 
more specific, the
- * following dir. should be available:
- * https://github.com/apache/hbase/tree/master/hbase-shell/src/main/ruby HBase 
Shell should be able
- * to connect to the HBase cluster from terminal. This makes sure that the 
client is configured
- * properly.
+ * Requirements:
+ * HBase Shell should be installed on the same machine. To be more specific, 
the following dir.
+ * should be available: 
https://github.com/apache/hbase/tree/master/hbase-shell/src/main/ruby
+ * HBase Shell should be able to connect to the HBase cluster from terminal. 
This makes sure
+ * that the client is configured properly.
  *
- * <p>The interpreter takes 3 config parameters: hbase.home: Root directory 
where HBase is
- * installed. Default is /usr/lib/hbase/ hbase.ruby.sources: Dir where shell 
ruby code is installed.
- * Path is relative to hbase.home. Default: lib/ruby zeppelin.hbase.test.mode: 
(Testing only)
- * Disable checks for unit and manual tests. Default: false
+ * The interpreter takes 3 config parameters:
+ * hbase.home: Root directory where HBase is installed. Default is 
/usr/lib/hbase/
+ * hbase.ruby.sources: Dir where shell ruby code is installed.
+ *                          Path is relative to hbase.home. Default: lib/ruby
+ * zeppelin.hbase.test.mode: (Testing only) Disable checks for unit and manual 
tests. Default: false
  */
 public class HbaseInterpreter extends Interpreter {
   public static final String HBASE_HOME = "hbase.home";
@@ -65,7 +68,7 @@ public class HbaseInterpreter extends Interpreter {
 
   @Override
   public void open() throws InterpreterException {
-    this.scriptingContainer = new 
ScriptingContainer(LocalContextScope.SINGLETON);
+    this.scriptingContainer  = new 
ScriptingContainer(LocalContextScope.SINGLETON);
     this.writer = new StringWriter();
     scriptingContainer.setOutput(this.writer);
 
@@ -79,8 +82,8 @@ public class HbaseInterpreter extends Interpreter {
 
       File f = absRubySrc.toFile();
       if (!f.exists() || !f.isDirectory()) {
-        throw new InterpreterException(
-            "HBase ruby sources is not available at '" + absRubySrc + "'");
+        throw new InterpreterException("HBase ruby sources is not available at 
'" + absRubySrc
+            + "'");
       }
 
       logger.info("Absolute Ruby Source:" + absRubySrc.toString());
@@ -136,17 +139,20 @@ public class HbaseInterpreter extends Interpreter {
 
   @Override
   public Scheduler getScheduler() {
-    return SchedulerFactory.singleton()
-        .createOrGetFIFOScheduler(HbaseInterpreter.class.getName() + 
this.hashCode());
+    return SchedulerFactory.singleton().createOrGetFIFOScheduler(
+        HbaseInterpreter.class.getName() + this.hashCode());
   }
 
   @Override
-  public List<InterpreterCompletion> completion(
-      String buf, int cursor, InterpreterContext interpreterContext) {
+  public List<InterpreterCompletion> completion(String buf, int cursor,
+      InterpreterContext interpreterContext) {
     return null;
   }
 
-  private static String getSystemDefault(String envName, String propertyName, 
String defaultValue) {
+  private static String getSystemDefault(
+      String envName,
+      String propertyName,
+      String defaultValue) {
 
     if (envName != null && !envName.isEmpty()) {
       String envValue = System.getenv().get(envName);

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/hbase/src/test/java/org/apache/zeppelin/hbase/HbaseInterpreterTest.java
----------------------------------------------------------------------
diff --git 
a/hbase/src/test/java/org/apache/zeppelin/hbase/HbaseInterpreterTest.java 
b/hbase/src/test/java/org/apache/zeppelin/hbase/HbaseInterpreterTest.java
index 82dd44c..37110d8 100644
--- a/hbase/src/test/java/org/apache/zeppelin/hbase/HbaseInterpreterTest.java
+++ b/hbase/src/test/java/org/apache/zeppelin/hbase/HbaseInterpreterTest.java
@@ -18,16 +18,20 @@ import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.notNullValue;
 import static org.junit.Assert.assertEquals;
 
-import java.util.Properties;
 import org.apache.log4j.BasicConfigurator;
-import org.apache.zeppelin.interpreter.InterpreterException;
-import org.apache.zeppelin.interpreter.InterpreterResult;
 import org.junit.BeforeClass;
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-/** Tests for HBase Interpreter. */
+import java.util.Properties;
+
+import org.apache.zeppelin.interpreter.InterpreterException;
+import org.apache.zeppelin.interpreter.InterpreterResult;
+
+/**
+ * Tests for HBase Interpreter.
+ */
 public class HbaseInterpreterTest {
   private static Logger logger = 
LoggerFactory.getLogger(HbaseInterpreterTest.class);
   private static HbaseInterpreter hbaseInterpreter;
@@ -43,7 +47,7 @@ public class HbaseInterpreterTest {
     hbaseInterpreter = new HbaseInterpreter(properties);
     hbaseInterpreter.open();
   }
-
+  
   @Test
   public void newObject() {
     assertThat(hbaseInterpreter, notNullValue());
@@ -56,10 +60,10 @@ public class HbaseInterpreterTest {
     assertEquals(result.message().get(0).getType(), 
InterpreterResult.Type.TEXT);
     assertEquals("Hello World\n", result.message().get(0).getData());
   }
-
+  
   public void putsLoadPath() {
-    InterpreterResult result =
-        hbaseInterpreter.interpret("require 'two_power'; puts 
twoToThePowerOf(4)", null);
+    InterpreterResult result = hbaseInterpreter.interpret(
+            "require 'two_power'; puts twoToThePowerOf(4)", null);
     assertEquals(InterpreterResult.Code.SUCCESS, result.code());
     assertEquals(result.message().get(0).getType(), 
InterpreterResult.Type.TEXT);
     assertEquals("16\n", result.message().get(0).getData());
@@ -69,8 +73,7 @@ public class HbaseInterpreterTest {
   public void testException() {
     InterpreterResult result = hbaseInterpreter.interpret("plot practical 
joke", null);
     assertEquals(InterpreterResult.Code.ERROR, result.code());
-    assertEquals(
-        "(NameError) undefined local variable or method `joke' for 
main:Object",
-        result.message().get(0).getData());
+    assertEquals("(NameError) undefined local variable or method `joke' for 
main:Object",
+            result.message().get(0).getData());
   }
 }

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/helium-dev/src/main/java/org/apache/zeppelin/helium/DevInterpreter.java
----------------------------------------------------------------------
diff --git 
a/helium-dev/src/main/java/org/apache/zeppelin/helium/DevInterpreter.java 
b/helium-dev/src/main/java/org/apache/zeppelin/helium/DevInterpreter.java
index 99c029b..00846de 100644
--- a/helium-dev/src/main/java/org/apache/zeppelin/helium/DevInterpreter.java
+++ b/helium-dev/src/main/java/org/apache/zeppelin/helium/DevInterpreter.java
@@ -17,17 +17,20 @@
 
 package org.apache.zeppelin.helium;
 
-import java.io.IOException;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.Properties;
 import org.apache.zeppelin.interpreter.Interpreter;
 import org.apache.zeppelin.interpreter.InterpreterContext;
 import org.apache.zeppelin.interpreter.InterpreterException;
 import org.apache.zeppelin.interpreter.InterpreterResult;
 import org.apache.zeppelin.interpreter.thrift.InterpreterCompletion;
 
-/** Dummy interpreter to support development mode for Zeppelin app */
+import java.io.IOException;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Properties;
+
+/**
+ * Dummy interpreter to support development mode for Zeppelin app
+ */
 public class DevInterpreter extends Interpreter {
 
   private InterpreterEvent interpreterEvent;
@@ -38,7 +41,9 @@ public class DevInterpreter extends Interpreter {
     return replName.equals("dev");
   }
 
-  /** event handler for 
org.apache.zeppelin.helium.ZeppelinApplicationDevServer */
+  /**
+   * event handler for org.apache.zeppelin.helium.ZeppelinApplicationDevServer
+   */
   public static interface InterpreterEvent {
     public InterpreterResult interpret(String st, InterpreterContext context);
   }
@@ -58,7 +63,8 @@ public class DevInterpreter extends Interpreter {
   }
 
   @Override
-  public void close() {}
+  public void close() {
+  }
 
   public void rerun() {
     try {
@@ -81,7 +87,8 @@ public class DevInterpreter extends Interpreter {
   }
 
   @Override
-  public void cancel(InterpreterContext context) {}
+  public void cancel(InterpreterContext context) {
+  }
 
   @Override
   public FormType getFormType() {
@@ -94,8 +101,8 @@ public class DevInterpreter extends Interpreter {
   }
 
   @Override
-  public List<InterpreterCompletion> completion(
-      String buf, int cursor, InterpreterContext interpreterContext) {
+  public List<InterpreterCompletion> completion(String buf, int cursor,
+      InterpreterContext interpreterContext) {
     return new LinkedList<>();
   }
 

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/helium-dev/src/main/java/org/apache/zeppelin/helium/DevZeppelinContext.java
----------------------------------------------------------------------
diff --git 
a/helium-dev/src/main/java/org/apache/zeppelin/helium/DevZeppelinContext.java 
b/helium-dev/src/main/java/org/apache/zeppelin/helium/DevZeppelinContext.java
index 744cd3d..75d193c 100644
--- 
a/helium-dev/src/main/java/org/apache/zeppelin/helium/DevZeppelinContext.java
+++ 
b/helium-dev/src/main/java/org/apache/zeppelin/helium/DevZeppelinContext.java
@@ -15,14 +15,18 @@
  * limitations under the License.
  */
 
+
 package org.apache.zeppelin.helium;
 
-import java.util.List;
-import java.util.Map;
 import org.apache.zeppelin.interpreter.BaseZeppelinContext;
 import org.apache.zeppelin.interpreter.InterpreterHookRegistry;
 
-/** ZeppelinContext for DevInterpreter */
+import java.util.List;
+import java.util.Map;
+
+/**
+ * ZeppelinContext for DevInterpreter
+ */
 public class DevZeppelinContext extends BaseZeppelinContext {
   public DevZeppelinContext(InterpreterHookRegistry hooks, int maxResult) {
     super(hooks, maxResult);

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/helium-dev/src/main/java/org/apache/zeppelin/helium/ZeppelinApplicationDevServer.java
----------------------------------------------------------------------
diff --git 
a/helium-dev/src/main/java/org/apache/zeppelin/helium/ZeppelinApplicationDevServer.java
 
b/helium-dev/src/main/java/org/apache/zeppelin/helium/ZeppelinApplicationDevServer.java
index edb1230..d0118e5 100644
--- 
a/helium-dev/src/main/java/org/apache/zeppelin/helium/ZeppelinApplicationDevServer.java
+++ 
b/helium-dev/src/main/java/org/apache/zeppelin/helium/ZeppelinApplicationDevServer.java
@@ -17,9 +17,10 @@
 
 package org.apache.zeppelin.helium;
 
-import com.google.gson.Gson;
 import java.io.IOException;
 import java.lang.reflect.Constructor;
+
+import com.google.gson.Gson;
 import org.apache.log4j.ConsoleAppender;
 import org.apache.log4j.Level;
 import org.apache.log4j.PatternLayout;
@@ -30,7 +31,9 @@ import org.apache.zeppelin.resource.ResourceSet;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-/** Run this server for development mode. */
+/**
+ * Run this server for development mode.
+ */
 public class ZeppelinApplicationDevServer extends ZeppelinDevServer {
   final Logger logger = 
LoggerFactory.getLogger(ZeppelinApplicationDevServer.class);
 
@@ -39,13 +42,13 @@ public class ZeppelinApplicationDevServer extends 
ZeppelinDevServer {
   private Application app;
   private InterpreterOutput out;
 
-  public ZeppelinApplicationDevServer(final String className, ResourceSet 
resourceSet)
-      throws Exception {
+  public ZeppelinApplicationDevServer(final String className, ResourceSet 
resourceSet) throws
+      Exception {
     this(Constants.ZEPPELIN_INTERPRETER_DEFAUlT_PORT, className, resourceSet);
   }
 
-  public ZeppelinApplicationDevServer(int port, String className, ResourceSet 
resourceSet)
-      throws Exception {
+  public ZeppelinApplicationDevServer(int port, String className, ResourceSet 
resourceSet) throws
+      Exception {
     super(port);
     this.className = className;
     this.resourceSet = resourceSet;
@@ -53,16 +56,17 @@ public class ZeppelinApplicationDevServer extends 
ZeppelinDevServer {
   };
 
   void setLogger() {
-    ConsoleAppender console = new ConsoleAppender(); // create appender
-    // configure the appender
+    ConsoleAppender console = new ConsoleAppender(); //create appender
+    //configure the appender
     String PATTERN = "%d [%p|%c|%C{1}] %m%n";
     console.setLayout(new PatternLayout(PATTERN));
     console.setThreshold(Level.DEBUG);
     console.activateOptions();
-    // add appender to any Logger (here is root)
+    //add appender to any Logger (here is root)
     org.apache.log4j.Logger.getRootLogger().addAppender(console);
   }
 
+
   @Override
   public InterpreterResult interpret(String st, InterpreterContext context) {
     if (app == null) {
@@ -136,29 +140,28 @@ public class ZeppelinApplicationDevServer extends 
ZeppelinDevServer {
     if (out == null) {
       final RemoteInterpreterEventClient eventClient = getIntpEventClient();
       try {
-        out =
-            new InterpreterOutput(
-                new InterpreterOutputListener() {
-                  @Override
-                  public void onUpdateAll(InterpreterOutput out) {}
-
-                  @Override
-                  public void onAppend(int index, 
InterpreterResultMessageOutput out, byte[] line) {
-                    eventClient.onInterpreterOutputAppend(
-                        noteId, paragraphId, index, new String(line));
-                  }
-
-                  @Override
-                  public void onUpdate(int index, 
InterpreterResultMessageOutput out) {
-                    try {
-                      eventClient.onInterpreterOutputUpdate(
-                          noteId, paragraphId, index, out.getType(), new 
String(out.toByteArray()));
-                    } catch (IOException e) {
-                      logger.error(e.getMessage(), e);
-                    }
-                  }
-                },
-                this);
+        out = new InterpreterOutput(new InterpreterOutputListener() {
+          @Override
+          public void onUpdateAll(InterpreterOutput out) {
+
+          }
+
+          @Override
+          public void onAppend(int index, InterpreterResultMessageOutput out, 
byte[] line) {
+            eventClient.onInterpreterOutputAppend(noteId, paragraphId, index, 
new String(line));
+          }
+
+          @Override
+          public void onUpdate(int index, InterpreterResultMessageOutput out) {
+            try {
+              eventClient.onInterpreterOutputUpdate(noteId, paragraphId,
+                  index, out.getType(), new String(out.toByteArray()));
+            } catch (IOException e) {
+              logger.error(e.getMessage(), e);
+            }
+          }
+
+        }, this);
       } catch (IOException e) {
         return null;
       }

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/helium-dev/src/main/java/org/apache/zeppelin/helium/ZeppelinDevServer.java
----------------------------------------------------------------------
diff --git 
a/helium-dev/src/main/java/org/apache/zeppelin/helium/ZeppelinDevServer.java 
b/helium-dev/src/main/java/org/apache/zeppelin/helium/ZeppelinDevServer.java
index e260510..4c0e867 100644
--- a/helium-dev/src/main/java/org/apache/zeppelin/helium/ZeppelinDevServer.java
+++ b/helium-dev/src/main/java/org/apache/zeppelin/helium/ZeppelinDevServer.java
@@ -20,6 +20,7 @@ package org.apache.zeppelin.helium;
 import java.io.File;
 import java.io.IOException;
 import java.util.HashMap;
+
 import org.apache.thrift.TException;
 import org.apache.zeppelin.helium.DevInterpreter.InterpreterEvent;
 import org.apache.zeppelin.interpreter.*;
@@ -28,14 +29,15 @@ import 
org.apache.zeppelin.interpreter.remote.RemoteInterpreterServer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-/** Interpreter development server */
-public class ZeppelinDevServer extends RemoteInterpreterServer
-    implements InterpreterEvent, InterpreterOutputChangeListener {
+/**
+ * Interpreter development server
+ */
+public class ZeppelinDevServer extends
+    RemoteInterpreterServer implements InterpreterEvent, 
InterpreterOutputChangeListener {
   private static final Logger logger = 
LoggerFactory.getLogger(ZeppelinDevServer.class);
 
   private DevInterpreter interpreter = null;
   private InterpreterOutput out;
-
   public ZeppelinDevServer(int port) throws TException, IOException {
     super(null, port, null, ":");
   }
@@ -56,7 +58,8 @@ public class ZeppelinDevServer extends RemoteInterpreterServer
     }
 
     Interpreter intp = super.getInterpreter(sessionId, className);
-    interpreter = (DevInterpreter) (((LazyOpenInterpreter) 
intp).getInnerInterpreter());
+    interpreter = (DevInterpreter) (
+        ((LazyOpenInterpreter) intp).getInnerInterpreter());
     interpreter.setInterpreterEvent(this);
     return super.getInterpreter(sessionId, className);
   }
@@ -67,29 +70,27 @@ public class ZeppelinDevServer extends 
RemoteInterpreterServer
     if (out == null) {
       final RemoteInterpreterEventClient eventClient = getIntpEventClient();
       try {
-        out =
-            new InterpreterOutput(
-                new InterpreterOutputListener() {
-                  @Override
-                  public void onUpdateAll(InterpreterOutput out) {}
-
-                  @Override
-                  public void onAppend(int index, 
InterpreterResultMessageOutput out, byte[] line) {
-                    eventClient.onInterpreterOutputAppend(
-                        noteId, paragraphId, index, new String(line));
-                  }
-
-                  @Override
-                  public void onUpdate(int index, 
InterpreterResultMessageOutput out) {
-                    try {
-                      eventClient.onInterpreterOutputUpdate(
-                          noteId, paragraphId, index, out.getType(), new 
String(out.toByteArray()));
-                    } catch (IOException e) {
-                      logger.error(e.getMessage(), e);
-                    }
-                  }
-                },
-                this);
+        out = new InterpreterOutput(new InterpreterOutputListener() {
+          @Override
+          public void onUpdateAll(InterpreterOutput out) {
+
+          }
+
+          @Override
+          public void onAppend(int index, InterpreterResultMessageOutput out, 
byte[] line) {
+            eventClient.onInterpreterOutputAppend(noteId, paragraphId, index, 
new String(line));
+          }
+
+          @Override
+          public void onUpdate(int index, InterpreterResultMessageOutput out) {
+            try {
+              eventClient.onInterpreterOutputUpdate(noteId, paragraphId,
+                  index, out.getType(), new String(out.toByteArray()));
+            } catch (IOException e) {
+              logger.error(e.getMessage(), e);
+            }
+          }
+        }, this);
       } catch (IOException e) {
         return null;
       }
@@ -114,7 +115,9 @@ public class ZeppelinDevServer extends 
RemoteInterpreterServer
     interpreter.rerun();
   }
 
-  /** Wait until %dev paragraph is executed and connected to this process */
+  /**
+   * Wait until %dev paragraph is executed and connected to this process
+   */
   public void waitForConnected() {
     synchronized (this) {
       while (!isConnected()) {

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/ignite/pom.xml
----------------------------------------------------------------------
diff --git a/ignite/pom.xml b/ignite/pom.xml
index cd778b8..7d7b3db 100644
--- a/ignite/pom.xml
+++ b/ignite/pom.xml
@@ -114,6 +114,13 @@
       <plugin>
         <artifactId>maven-resources-plugin</artifactId>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-checkstyle-plugin</artifactId>
+        <configuration>
+          <skip>false</skip>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
 

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/ignite/src/main/java/org/apache/zeppelin/ignite/IgniteInterpreter.java
----------------------------------------------------------------------
diff --git 
a/ignite/src/main/java/org/apache/zeppelin/ignite/IgniteInterpreter.java 
b/ignite/src/main/java/org/apache/zeppelin/ignite/IgniteInterpreter.java
index 9aa85a2..e104039 100644
--- a/ignite/src/main/java/org/apache/zeppelin/ignite/IgniteInterpreter.java
+++ b/ignite/src/main/java/org/apache/zeppelin/ignite/IgniteInterpreter.java
@@ -16,6 +16,14 @@
  */
 package org.apache.zeppelin.ignite;
 
+import org.apache.ignite.Ignite;
+import org.apache.ignite.Ignition;
+import org.apache.ignite.configuration.IgniteConfiguration;
+import org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi;
+import org.apache.ignite.spi.discovery.tcp.ipfinder.vm.TcpDiscoveryVmIpFinder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.PrintWriter;
@@ -27,21 +35,7 @@ import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.Properties;
-import org.apache.ignite.Ignite;
-import org.apache.ignite.Ignition;
-import org.apache.ignite.configuration.IgniteConfiguration;
-import org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi;
-import org.apache.ignite.spi.discovery.tcp.ipfinder.vm.TcpDiscoveryVmIpFinder;
-import org.apache.zeppelin.interpreter.Interpreter;
-import org.apache.zeppelin.interpreter.InterpreterContext;
-import org.apache.zeppelin.interpreter.InterpreterResult;
-import org.apache.zeppelin.interpreter.InterpreterResult.Code;
-import org.apache.zeppelin.interpreter.InterpreterUtils;
-import org.apache.zeppelin.interpreter.thrift.InterpreterCompletion;
-import org.apache.zeppelin.scheduler.Scheduler;
-import org.apache.zeppelin.scheduler.SchedulerFactory;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+
 import scala.Console;
 import scala.Some;
 import scala.collection.JavaConversions;
@@ -51,20 +45,29 @@ import scala.tools.nsc.interpreter.Results.Result;
 import scala.tools.nsc.settings.MutableSettings.BooleanSetting;
 import scala.tools.nsc.settings.MutableSettings.PathSetting;
 
+import org.apache.zeppelin.interpreter.Interpreter;
+import org.apache.zeppelin.interpreter.InterpreterContext;
+import org.apache.zeppelin.interpreter.InterpreterResult;
+import org.apache.zeppelin.interpreter.InterpreterResult.Code;
+import org.apache.zeppelin.interpreter.InterpreterUtils;
+import org.apache.zeppelin.interpreter.thrift.InterpreterCompletion;
+import org.apache.zeppelin.scheduler.Scheduler;
+import org.apache.zeppelin.scheduler.SchedulerFactory;
+
 /**
  * Apache Ignite interpreter (http://ignite.incubator.apache.org/).
  *
- * <p>Use the following properties for interpreter configuration:
+ * Use the following properties for interpreter configuration:
  *
  * <ul>
- *   <li>{@code ignite.addresses} - coma separated list of hosts in form 
{@code <host>:<port>} or
- *       {@code <host>:<port_1>..<port_n>}
- *   <li>{@code ignite.clientMode} - indicates that Ignite interpreter should 
start node in client
- *       mode ({@code true} or {@code false}).
- *   <li>{@code ignite.peerClassLoadingEnabled} - enables/disables peer class 
loading ({@code true}
- *       or {@code false}).
- *   <li>{@code ignite.config.url} - URL for Ignite configuration. If this URL 
specified then all
- *       aforementioned properties will not be taken in account.
+ *     <li>{@code ignite.addresses} - coma separated list of hosts in form 
{@code <host>:<port>}
+ *     or {@code <host>:<port_1>..<port_n>} </li>
+ *     <li>{@code ignite.clientMode} - indicates that Ignite interpreter
+ *     should start node in client mode ({@code true} or {@code false}).</li>
+ *     <li>{@code ignite.peerClassLoadingEnabled} - enables/disables peer 
class loading
+ *     ({@code true} or {@code false}).</li>
+ *     <li>{@code ignite.config.url} - URL for Ignite configuration. If this 
URL specified then
+ *     all aforementioned properties will not be taken in account.</li>
  * </ul>
  */
 public class IgniteInterpreter extends Interpreter {
@@ -159,11 +162,9 @@ public class IgniteInterpreter extends Interpreter {
   }
 
   public Object getLastObject() {
-    Object obj =
-        imain
-            .lastRequest()
-            .lineRep()
-            .call("$result", JavaConversions.asScalaBuffer(new 
LinkedList<>()));
+    Object obj = imain.lastRequest().lineRep().call(
+        "$result",
+        JavaConversions.asScalaBuffer(new LinkedList<>()));
     return obj;
   }
 
@@ -187,14 +188,14 @@ public class IgniteInterpreter extends Interpreter {
           conf.setDiscoverySpi(discoSpi);
 
           conf.setPeerClassLoadingEnabled(
-              
Boolean.parseBoolean(getProperty(IGNITE_PEER_CLASS_LOADING_ENABLED)));
+                  
Boolean.parseBoolean(getProperty(IGNITE_PEER_CLASS_LOADING_ENABLED)));
 
           ignite = Ignition.start(conf);
         }
 
         initEx = null;
       } catch (Exception e) {
-        logger.error("Error in IgniteInterpreter while getIgnite: ", e);
+        logger.error("Error in IgniteInterpreter while getIgnite: " , e);
         initEx = e;
       }
     }
@@ -210,10 +211,9 @@ public class IgniteInterpreter extends Interpreter {
       if (getIgnite() != null) {
         binder.put("ignite", ignite);
 
-        imain.interpret(
-            "@transient val ignite = "
-                + "_binder.get(\"ignite\")"
-                + ".asInstanceOf[org.apache.ignite.Ignite]");
+        imain.interpret("@transient val ignite = "
+            + "_binder.get(\"ignite\")"
+            + ".asInstanceOf[org.apache.ignite.Ignite]");
       }
     } finally {
       Thread.currentThread().setContextClassLoader(contextClassLoader);
@@ -263,7 +263,8 @@ public class IgniteInterpreter extends Interpreter {
   }
 
   @Override
-  public void cancel(InterpreterContext context) {}
+  public void cancel(InterpreterContext context) {
+  }
 
   private InterpreterResult interpret(String[] lines) {
     String[] linesToRun = new String[lines.length + 1];
@@ -276,7 +277,7 @@ public class IgniteInterpreter extends Interpreter {
 
     String incomplete = "";
     for (int l = 0; l < linesToRun.length; l++) {
-      String s = linesToRun[l];
+      String s = linesToRun[l];      
       // check if next line starts with "." (but not ".." or "./") it is 
treated as an invocation
       if (l + 1 < linesToRun.length) {
         String nextLine = linesToRun[l + 1].trim();
@@ -333,14 +334,14 @@ public class IgniteInterpreter extends Interpreter {
   }
 
   @Override
-  public List<InterpreterCompletion> completion(
-      String buf, int cursor, InterpreterContext interpreterContext) {
+  public List<InterpreterCompletion> completion(String buf, int cursor,
+      InterpreterContext interpreterContext) {
     return new LinkedList<>();
   }
 
   @Override
   public Scheduler getScheduler() {
-    return SchedulerFactory.singleton()
-        .createOrGetFIFOScheduler(IgniteInterpreter.class.getName() + 
this.hashCode());
+    return SchedulerFactory.singleton().createOrGetFIFOScheduler(
+            IgniteInterpreter.class.getName() + this.hashCode());
   }
 }

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/ignite/src/main/java/org/apache/zeppelin/ignite/IgniteInterpreterUtils.java
----------------------------------------------------------------------
diff --git 
a/ignite/src/main/java/org/apache/zeppelin/ignite/IgniteInterpreterUtils.java 
b/ignite/src/main/java/org/apache/zeppelin/ignite/IgniteInterpreterUtils.java
index 936f081..74a0a7f 100644
--- 
a/ignite/src/main/java/org/apache/zeppelin/ignite/IgniteInterpreterUtils.java
+++ 
b/ignite/src/main/java/org/apache/zeppelin/ignite/IgniteInterpreterUtils.java
@@ -19,11 +19,12 @@ package org.apache.zeppelin.ignite;
 
 import org.apache.zeppelin.interpreter.InterpreterResult;
 
-/** Apache Ignite interpreter utils. */
+/**
+ * Apache Ignite interpreter utils.
+ */
 public class IgniteInterpreterUtils {
   /**
    * Builds error result from given exception.
-   *
    * @param e Exception.
    * @return result.
    */

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/ignite/src/main/java/org/apache/zeppelin/ignite/IgniteSqlInterpreter.java
----------------------------------------------------------------------
diff --git 
a/ignite/src/main/java/org/apache/zeppelin/ignite/IgniteSqlInterpreter.java 
b/ignite/src/main/java/org/apache/zeppelin/ignite/IgniteSqlInterpreter.java
index 8357740..100a733 100644
--- a/ignite/src/main/java/org/apache/zeppelin/ignite/IgniteSqlInterpreter.java
+++ b/ignite/src/main/java/org/apache/zeppelin/ignite/IgniteSqlInterpreter.java
@@ -16,6 +16,9 @@
  */
 package org.apache.zeppelin.ignite;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.ResultSet;
@@ -25,6 +28,7 @@ import java.sql.Statement;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Properties;
+
 import org.apache.zeppelin.interpreter.Interpreter;
 import org.apache.zeppelin.interpreter.InterpreterContext;
 import org.apache.zeppelin.interpreter.InterpreterException;
@@ -33,20 +37,19 @@ import 
org.apache.zeppelin.interpreter.InterpreterResult.Code;
 import org.apache.zeppelin.interpreter.thrift.InterpreterCompletion;
 import org.apache.zeppelin.scheduler.Scheduler;
 import org.apache.zeppelin.scheduler.SchedulerFactory;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 /**
  * Apache Ignite SQL interpreter (http://ignite.incubator.apache.org/).
  *
- * <p>Use {@code ignite.jdbc.url} property to set up JDBC connection URL. URL 
has the following
- * pattern: {@code jdbc:ignite://<hostname>:<port>/<cache_name>}
+ * Use {@code ignite.jdbc.url} property to set up JDBC connection URL.
+ * URL has the following pattern:
+ * {@code jdbc:ignite://<hostname>:<port>/<cache_name>}
  *
  * <ul>
- *   <li>Hostname is required.
- *   <li>If port is not defined, 11211 is used (default for Ignite client).
- *   <li>Leave cache_name empty if you are connecting to a default cache. Note 
that the cache name
- *       is case sensitive.
+ *     <li>Hostname is required.</li>
+ *     <li>If port is not defined, 11211 is used (default for Ignite 
client).</li>
+ *     <li>Leave cache_name empty if you are connecting to a default cache.
+ *     Note that the cache name is case sensitive.</li>
  * </ul>
  */
 public class IgniteSqlInterpreter extends Interpreter {
@@ -176,13 +179,13 @@ public class IgniteSqlInterpreter extends Interpreter {
 
   @Override
   public Scheduler getScheduler() {
-    return SchedulerFactory.singleton()
-        .createOrGetFIFOScheduler(IgniteSqlInterpreter.class.getName() + 
this.hashCode());
+    return SchedulerFactory.singleton().createOrGetFIFOScheduler(
+            IgniteSqlInterpreter.class.getName() + this.hashCode());
   }
 
   @Override
-  public List<InterpreterCompletion> completion(
-      String buf, int cursor, InterpreterContext interpreterContext) {
+  public List<InterpreterCompletion> completion(String buf, int cursor,
+      InterpreterContext interpreterContext) {
     return new LinkedList<>();
   }
 }

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/ignite/src/test/java/org/apache/zeppelin/ignite/IgniteInterpreterTest.java
----------------------------------------------------------------------
diff --git 
a/ignite/src/test/java/org/apache/zeppelin/ignite/IgniteInterpreterTest.java 
b/ignite/src/test/java/org/apache/zeppelin/ignite/IgniteInterpreterTest.java
index 11b39d7..de4588e 100644
--- a/ignite/src/test/java/org/apache/zeppelin/ignite/IgniteInterpreterTest.java
+++ b/ignite/src/test/java/org/apache/zeppelin/ignite/IgniteInterpreterTest.java
@@ -16,11 +16,6 @@
  */
 package org.apache.zeppelin.ignite;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
-
-import java.util.Collections;
-import java.util.Properties;
 import org.apache.ignite.Ignite;
 import org.apache.ignite.Ignition;
 import org.apache.ignite.configuration.IgniteConfiguration;
@@ -32,7 +27,15 @@ import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 
-/** Tests for Apache Ignite interpreter ({@link IgniteInterpreter}). */
+import java.util.Collections;
+import java.util.Properties;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * Tests for Apache Ignite interpreter ({@link IgniteInterpreter}).
+ */
 public class IgniteInterpreterTest {
   private static final String HOST = "127.0.0.1:47500..47509";
 
@@ -57,9 +60,8 @@ public class IgniteInterpreterTest {
     ignite = Ignition.start(cfg);
 
     Properties props = new Properties();
-    props.setProperty(
-        IgniteSqlInterpreter.IGNITE_JDBC_URL,
-        "jdbc:ignite:cfg://[email protected]");
+    props.setProperty(IgniteSqlInterpreter.IGNITE_JDBC_URL,
+            "jdbc:ignite:cfg://[email protected]");
     props.setProperty(IgniteInterpreter.IGNITE_CLIENT_MODE, "false");
     props.setProperty(IgniteInterpreter.IGNITE_PEER_CLASS_LOADING_ENABLED, 
"false");
     props.setProperty(IgniteInterpreter.IGNITE_ADDRESSES, HOST);
@@ -78,21 +80,12 @@ public class IgniteInterpreterTest {
   public void testInterpret() {
     String sizeVal = "size";
 
-    InterpreterResult result =
-        intp.interpret(
-            "import org.apache.ignite.IgniteCache\n"
-                + "val "
-                + sizeVal
-                + " = ignite.cluster().nodes().size()",
-            INTP_CONTEXT);
+    InterpreterResult result = intp.interpret("import 
org.apache.ignite.IgniteCache\n" +
+            "val " + sizeVal + " = ignite.cluster().nodes().size()", 
INTP_CONTEXT);
 
     assertEquals(InterpreterResult.Code.SUCCESS, result.code());
-    assertTrue(
-        result
-            .message()
-            .get(0)
-            .getData()
-            .contains(sizeVal + ": Int = " + ignite.cluster().nodes().size()));
+    assertTrue(result.message().get(0).getData().contains(sizeVal + ": Int = " 
+
+            ignite.cluster().nodes().size()));
 
     result = intp.interpret("\"123\"\n  .toInt", INTP_CONTEXT);
     assertEquals(InterpreterResult.Code.SUCCESS, result.code());

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/ignite/src/test/java/org/apache/zeppelin/ignite/IgniteSqlInterpreterTest.java
----------------------------------------------------------------------
diff --git 
a/ignite/src/test/java/org/apache/zeppelin/ignite/IgniteSqlInterpreterTest.java 
b/ignite/src/test/java/org/apache/zeppelin/ignite/IgniteSqlInterpreterTest.java
index dd38614..3597769 100644
--- 
a/ignite/src/test/java/org/apache/zeppelin/ignite/IgniteSqlInterpreterTest.java
+++ 
b/ignite/src/test/java/org/apache/zeppelin/ignite/IgniteSqlInterpreterTest.java
@@ -16,10 +16,6 @@
  */
 package org.apache.zeppelin.ignite;
 
-import static org.junit.Assert.assertEquals;
-
-import java.util.Collections;
-import java.util.Properties;
 import org.apache.ignite.Ignite;
 import org.apache.ignite.IgniteCache;
 import org.apache.ignite.Ignition;
@@ -36,7 +32,14 @@ import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 
-/** Tests for Apache Ignite SQL interpreter ({@link IgniteSqlInterpreter}). */
+import java.util.Collections;
+import java.util.Properties;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Tests for Apache Ignite SQL interpreter ({@link IgniteSqlInterpreter}).
+ */
 public class IgniteSqlInterpreterTest {
   private static final String HOST = "127.0.0.1:47500..47509";
 
@@ -62,9 +65,8 @@ public class IgniteSqlInterpreterTest {
     ignite = Ignition.start(cfg);
 
     Properties props = new Properties();
-    props.setProperty(
-        IgniteSqlInterpreter.IGNITE_JDBC_URL,
-        "jdbc:ignite:cfg://[email protected]");
+    props.setProperty(IgniteSqlInterpreter.IGNITE_JDBC_URL,
+            "jdbc:ignite:cfg://[email protected]");
 
     intp = new IgniteSqlInterpreter(props);
 
@@ -88,8 +90,8 @@ public class IgniteSqlInterpreterTest {
 
   @Test
   public void testSql() {
-    InterpreterResult result =
-        intp.interpret("select name, age from person where age > 10", 
INTP_CONTEXT);
+    InterpreterResult result = intp.interpret("select name, age from person 
where age > 10",
+            INTP_CONTEXT);
 
     assertEquals(Code.SUCCESS, result.code());
     assertEquals(Type.TABLE, result.message().get(0).getType());

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/ignite/src/test/java/org/apache/zeppelin/ignite/Person.java
----------------------------------------------------------------------
diff --git a/ignite/src/test/java/org/apache/zeppelin/ignite/Person.java 
b/ignite/src/test/java/org/apache/zeppelin/ignite/Person.java
index 7b863d2..e8bef93 100644
--- a/ignite/src/test/java/org/apache/zeppelin/ignite/Person.java
+++ b/ignite/src/test/java/org/apache/zeppelin/ignite/Person.java
@@ -16,13 +16,16 @@
  */
 package org.apache.zeppelin.ignite;
 
-import java.io.Serializable;
 import org.apache.ignite.cache.query.annotations.QuerySqlField;
 
+import java.io.Serializable;
+
 public class Person implements Serializable {
-  @QuerySqlField private String name;
+  @QuerySqlField
+  private String name;
 
-  @QuerySqlField private int age;
+  @QuerySqlField
+  private int age;
 
   public Person(String name, int age) {
     this.name = name;

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/java/pom.xml
----------------------------------------------------------------------
diff --git a/java/pom.xml b/java/pom.xml
index 0bbb8e8..9e9bbc6 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -76,6 +76,13 @@
       <plugin>
         <artifactId>maven-resources-plugin</artifactId>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-checkstyle-plugin</artifactId>
+        <configuration>
+          <skip>false</skip>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
 </project>

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/java/src/main/java/org/apache/zeppelin/java/JavaInterpreter.java
----------------------------------------------------------------------
diff --git a/java/src/main/java/org/apache/zeppelin/java/JavaInterpreter.java 
b/java/src/main/java/org/apache/zeppelin/java/JavaInterpreter.java
index 3690e35..1346bc7 100644
--- a/java/src/main/java/org/apache/zeppelin/java/JavaInterpreter.java
+++ b/java/src/main/java/org/apache/zeppelin/java/JavaInterpreter.java
@@ -17,11 +17,6 @@
 
 package org.apache.zeppelin.java;
 
-import java.io.File;
-import java.util.Collections;
-import java.util.List;
-import java.util.Properties;
-import java.util.UUID;
 import org.apache.zeppelin.interpreter.Interpreter;
 import org.apache.zeppelin.interpreter.InterpreterContext;
 import org.apache.zeppelin.interpreter.InterpreterResult;
@@ -29,7 +24,15 @@ import 
org.apache.zeppelin.interpreter.thrift.InterpreterCompletion;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-/** Java interpreter */
+import java.io.File;
+import java.util.Collections;
+import java.util.List;
+import java.util.Properties;
+import java.util.UUID;
+
+/**
+ * Java interpreter
+ */
 public class JavaInterpreter extends Interpreter {
 
   private static final Logger logger = 
LoggerFactory.getLogger(JavaInterpreter.class);
@@ -39,7 +42,9 @@ public class JavaInterpreter extends Interpreter {
   }
 
   @Override
-  public void open() {}
+  public void open() {
+
+  }
 
   @Override
   public void close() {
@@ -66,11 +71,15 @@ public class JavaInterpreter extends Interpreter {
     } catch (Exception e) {
       logger.error("Exception in Interpreter while interpret", e);
       return new InterpreterResult(InterpreterResult.Code.ERROR, 
e.getMessage());
+
     }
+
   }
 
   @Override
-  public void cancel(InterpreterContext context) {}
+  public void cancel(InterpreterContext context) {
+
+  }
 
   @Override
   public FormType getFormType() {
@@ -83,8 +92,9 @@ public class JavaInterpreter extends Interpreter {
   }
 
   @Override
-  public List<InterpreterCompletion> completion(
-      String buf, int cursor, InterpreterContext interpreterContext) {
+  public List<InterpreterCompletion> completion(String buf, int cursor,
+                                                InterpreterContext 
interpreterContext) {
     return Collections.emptyList();
   }
+
 }

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/java/src/main/java/org/apache/zeppelin/java/JavaInterpreterUtils.java
----------------------------------------------------------------------
diff --git 
a/java/src/main/java/org/apache/zeppelin/java/JavaInterpreterUtils.java 
b/java/src/main/java/org/apache/zeppelin/java/JavaInterpreterUtils.java
index e1f4d53..2a4cc4a 100644
--- a/java/src/main/java/org/apache/zeppelin/java/JavaInterpreterUtils.java
+++ b/java/src/main/java/org/apache/zeppelin/java/JavaInterpreterUtils.java
@@ -20,25 +20,25 @@ package org.apache.zeppelin.java;
 import java.util.Map;
 import java.util.stream.Collectors;
 
-/** Java interpreter utility methods */
+/**
+ * Java interpreter utility methods
+ */
 public class JavaInterpreterUtils {
 
   /**
    * Convert a map to %table display system to leverage Zeppelin's built in 
visualization
-   *
    * @param keyName Key column name
    * @param valueName Value column name
    * @param rows Map of keys and values
    * @return Zeppelin %table
    */
-  public static String displayTableFromSimpleMap(String keyName, String 
valueName, Map<?, ?> rows) {
+  public static String displayTableFromSimpleMap(String keyName, String 
valueName, Map<?, ?> rows){
     String table = "%table\n";
     table += keyName + "\t" + valueName + "\n";
-    table +=
-        rows.entrySet()
-            .stream()
+    table += rows.entrySet().stream()
             .map(e -> e.getKey() + "\t" + e.getValue())
             .collect(Collectors.joining("\n"));
     return table;
   }
+
 }

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/java/src/main/java/org/apache/zeppelin/java/StaticRepl.java
----------------------------------------------------------------------
diff --git a/java/src/main/java/org/apache/zeppelin/java/StaticRepl.java 
b/java/src/main/java/org/apache/zeppelin/java/StaticRepl.java
index cb9d316..28a3275 100644
--- a/java/src/main/java/org/apache/zeppelin/java/StaticRepl.java
+++ b/java/src/main/java/org/apache/zeppelin/java/StaticRepl.java
@@ -20,6 +20,16 @@ package org.apache.zeppelin.java;
 import com.thoughtworks.qdox.JavaProjectBuilder;
 import com.thoughtworks.qdox.model.JavaClass;
 import com.thoughtworks.qdox.model.JavaSource;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.tools.Diagnostic;
+import javax.tools.DiagnosticCollector;
+import javax.tools.JavaCompiler;
+import javax.tools.JavaCompiler.CompilationTask;
+import javax.tools.JavaFileObject;
+import javax.tools.SimpleJavaFileObject;
+import javax.tools.ToolProvider;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.PrintStream;
@@ -30,17 +40,10 @@ import java.net.URL;
 import java.net.URLClassLoader;
 import java.util.Arrays;
 import java.util.List;
-import javax.tools.Diagnostic;
-import javax.tools.DiagnosticCollector;
-import javax.tools.JavaCompiler;
-import javax.tools.JavaCompiler.CompilationTask;
-import javax.tools.JavaFileObject;
-import javax.tools.SimpleJavaFileObject;
-import javax.tools.ToolProvider;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
-/** StaticRepl for compling the java code in memory */
+/**
+ * StaticRepl for compling the java code in memory
+ */
 public class StaticRepl {
   static Logger logger = LoggerFactory.getLogger(StaticRepl.class);
 
@@ -62,8 +65,8 @@ public class StaticRepl {
       boolean hasMain = false;
 
       for (int j = 0; j < classes.get(i).getMethods().size(); j++) {
-        if (classes.get(i).getMethods().get(j).getName().equals("main")
-            && classes.get(i).getMethods().get(j).isStatic()) {
+        if (classes.get(i).getMethods().get(j).getName().equals("main") && 
classes.get(i)
+            .getMethods().get(j).isStatic()) {
           mainClassName = classes.get(i).getName();
           hasMain = true;
           break;
@@ -72,12 +75,13 @@ public class StaticRepl {
       if (hasMain == true) {
         break;
       }
+
     }
 
     // if there isn't Main method, will retuen error
     if (mainClassName == null) {
-      logger.error(
-          "Exception for Main method", "There isn't any class " + "containing 
static main method.");
+      logger.error("Exception for Main method", "There isn't any class "
+          + "containing static main method.");
       throw new Exception("There isn't any class containing static main 
method.");
     }
 
@@ -111,8 +115,8 @@ public class StaticRepl {
         if (diagnostic.getLineNumber() == -1) {
           continue;
         }
-        System.err.println(
-            "line " + diagnostic.getLineNumber() + " : " + 
diagnostic.getMessage(null));
+        System.err.println("line " + diagnostic.getLineNumber() + " : "
+            + diagnostic.getMessage(null));
       }
       System.out.flush();
       System.err.flush();
@@ -125,12 +129,12 @@ public class StaticRepl {
       try {
 
         // creating new class loader
-        URLClassLoader classLoader =
-            URLClassLoader.newInstance(new URL[] {new 
File("").toURI().toURL()});
+        URLClassLoader classLoader = URLClassLoader.newInstance(new URL[]{new 
File("").toURI()
+            .toURL()});
         // execute the Main method
         Class.forName(generatedClassName, true, classLoader)
-            .getDeclaredMethod("main", new Class[] {String[].class})
-            .invoke(null, new Object[] {null});
+            .getDeclaredMethod("main", new Class[]{String[].class})
+            .invoke(null, new Object[]{null});
 
         System.out.flush();
         System.err.flush();
@@ -141,9 +145,7 @@ public class StaticRepl {
 
         return baosOut.toString();
 
-      } catch (ClassNotFoundException
-          | NoSuchMethodException
-          | IllegalAccessException
+      } catch (ClassNotFoundException | NoSuchMethodException | 
IllegalAccessException
           | InvocationTargetException e) {
         logger.error("Exception in Interpreter while execution", e);
         System.err.println(e);
@@ -159,7 +161,9 @@ public class StaticRepl {
         System.setErr(oldErr);
       }
     }
+
   }
+
 }
 
 class JavaSourceFromString extends SimpleJavaFileObject {

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0d746fa2/jdbc/pom.xml
----------------------------------------------------------------------
diff --git a/jdbc/pom.xml b/jdbc/pom.xml
index 38e1469..ad35a46 100644
--- a/jdbc/pom.xml
+++ b/jdbc/pom.xml
@@ -362,6 +362,13 @@
       <plugin>
         <artifactId>maven-resources-plugin</artifactId>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-checkstyle-plugin</artifactId>
+        <configuration>
+          <skip>false</skip>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
 </project>

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