Repository: zeppelin
Updated Branches:
  refs/heads/master 322c86865 -> 0a47b1393


ZEPPELIN-3142. Fixed Checkstyle errors and warnings in the livy module

### What is this PR for?
Fixed the Checkstyle errors and warnings in the **livy** module.

### What type of PR is it?
Improvement

### Todos
* [ ] - Task

### What is the Jira issue?
* https://issues.apache.org/jira/browse/ZEPPELIN-3142

### How should this be tested?
* CI pass

### Screenshots (if appropriate)

### Questions:
* Does the licenses files need update? no
* Is there breaking changes for older versions? no
* Does this needs documentation? no

Author: Jan Hentschel <jan.hentsc...@ultratendency.com>

Closes #2768 from HorizonNet/ZEPPELIN-3142 and squashes the following commits:

6b6f5b0 [Jan Hentschel] ZEPPELIN-3142. Reverted package-lock.json
0ad26f3 [Jan Hentschel] Merge branch 'master' into ZEPPELIN-3142
c090d24 [Jan Hentschel] Merge branch 'master' into ZEPPELIN-3142
b53d145 [Jan Hentschel] ZEPPELIN-3142. Fixed Checkstyle errors and warnings in 
the livy module


Project: http://git-wip-us.apache.org/repos/asf/zeppelin/repo
Commit: http://git-wip-us.apache.org/repos/asf/zeppelin/commit/0a47b139
Tree: http://git-wip-us.apache.org/repos/asf/zeppelin/tree/0a47b139
Diff: http://git-wip-us.apache.org/repos/asf/zeppelin/diff/0a47b139

Branch: refs/heads/master
Commit: 0a47b1393a3e8b3f907326ced359fe8b987c4fc7
Parents: 322c868
Author: Jan Hentschel <jan.hentsc...@ultratendency.com>
Authored: Tue Mar 27 12:26:12 2018 +0200
Committer: Jeff Zhang <zjf...@apache.org>
Committed: Wed Apr 25 11:47:24 2018 +0800

----------------------------------------------------------------------
 livy/pom.xml                                    |   8 ++
 .../zeppelin/livy/BaseLivyInterpreter.java      | 118 ++++++++++---------
 .../org/apache/zeppelin/livy/LivyException.java |   2 +-
 .../livy/LivyPySparkBaseInterpreter.java        |   3 +-
 .../zeppelin/livy/LivySharedInterpreter.java    |  11 +-
 .../zeppelin/livy/LivySparkSQLInterpreter.java  |  29 +++--
 .../org/apache/zeppelin/livy/LivyVersion.java   |   2 +-
 .../apache/zeppelin/livy/LivyInterpreterIT.java |  86 ++++++++------
 .../zeppelin/livy/LivySQLInterpreterTest.java   |  12 +-
 9 files changed, 152 insertions(+), 119 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0a47b139/livy/pom.xml
----------------------------------------------------------------------
diff --git a/livy/pom.xml b/livy/pom.xml
index eddeb83..6c911e1 100644
--- a/livy/pom.xml
+++ b/livy/pom.xml
@@ -407,6 +407,14 @@
                     </execution>
                 </executions>
             </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/0a47b139/livy/src/main/java/org/apache/zeppelin/livy/BaseLivyInterpreter.java
----------------------------------------------------------------------
diff --git 
a/livy/src/main/java/org/apache/zeppelin/livy/BaseLivyInterpreter.java 
b/livy/src/main/java/org/apache/zeppelin/livy/BaseLivyInterpreter.java
index de0fff2..9d2c0cf 100644
--- a/livy/src/main/java/org/apache/zeppelin/livy/BaseLivyInterpreter.java
+++ b/livy/src/main/java/org/apache/zeppelin/livy/BaseLivyInterpreter.java
@@ -17,23 +17,9 @@
 
 package org.apache.zeppelin.livy;
 
-import java.io.FileInputStream;
-import java.io.IOException;
-import java.nio.charset.Charset;
-import java.security.KeyStore;
-import java.security.Principal;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Properties;
-import java.util.Set;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-
-import javax.net.ssl.SSLContext;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.annotations.SerializedName;
 
 import org.apache.commons.lang.StringUtils;
 import org.apache.commons.lang.exception.ExceptionUtils;
@@ -52,16 +38,6 @@ import org.apache.http.impl.auth.SPNegoSchemeFactory;
 import org.apache.http.impl.client.BasicCredentialsProvider;
 import org.apache.http.impl.client.HttpClientBuilder;
 import org.apache.http.impl.client.HttpClients;
-import org.apache.zeppelin.interpreter.Interpreter;
-import org.apache.zeppelin.interpreter.Interpreter.FormType;
-import org.apache.zeppelin.interpreter.InterpreterContext;
-import org.apache.zeppelin.interpreter.InterpreterException;
-import org.apache.zeppelin.interpreter.InterpreterResult;
-import org.apache.zeppelin.interpreter.InterpreterResultMessage;
-import org.apache.zeppelin.interpreter.InterpreterUtils;
-import org.apache.zeppelin.interpreter.LazyOpenInterpreter;
-import org.apache.zeppelin.interpreter.WrappedInterpreter;
-import org.apache.zeppelin.interpreter.thrift.InterpreterCompletion;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.http.HttpEntity;
@@ -77,10 +53,33 @@ import 
org.springframework.web.client.HttpServerErrorException;
 import org.springframework.web.client.RestClientException;
 import org.springframework.web.client.RestTemplate;
 
-import com.google.gson.Gson;
-import com.google.gson.GsonBuilder;
-import com.google.gson.annotations.SerializedName;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.security.KeyStore;
+import java.security.Principal;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import javax.net.ssl.SSLContext;
 
+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.InterpreterResultMessage;
+import org.apache.zeppelin.interpreter.InterpreterUtils;
+import org.apache.zeppelin.interpreter.LazyOpenInterpreter;
+import org.apache.zeppelin.interpreter.WrappedInterpreter;
+import org.apache.zeppelin.interpreter.thrift.InterpreterCompletion;
 
 /**
  * Base class for livy interpreters.
@@ -89,7 +88,7 @@ public abstract class BaseLivyInterpreter extends Interpreter 
{
 
   protected static final Logger LOGGER = 
LoggerFactory.getLogger(BaseLivyInterpreter.class);
   private static Gson gson = new 
GsonBuilder().setPrettyPrinting().disableHtmlEscaping().create();
-  private static String SESSION_NOT_FOUND_PATTERN = "\"Session '\\d+' not 
found.\"";
+  private static final String SESSION_NOT_FOUND_PATTERN = "\"Session '\\d+' 
not found.\"";
 
   protected volatile SessionInfo sessionInfo;
   private String livyURL;
@@ -324,8 +323,9 @@ public abstract class BaseLivyInterpreter extends 
Interpreter {
       Map<String, String> conf = new HashMap<>();
       for (Map.Entry<Object, Object> entry : getProperties().entrySet()) {
         if (entry.getKey().toString().startsWith("livy.spark.") &&
-            !entry.getValue().toString().isEmpty())
+            !entry.getValue().toString().isEmpty()) {
           conf.put(entry.getKey().toString().substring(5), 
entry.getValue().toString());
+        }
       }
 
       CreateSessionRequest request = new CreateSessionRequest(kind,
@@ -450,8 +450,7 @@ public abstract class BaseLivyInterpreter extends 
Interpreter {
         cancelStatement(id);
       } catch (LivyException e) {
         LOGGER.error("Fail to cancel statement " + id + " for paragraph " + 
paragraphId, e);
-      }
-      finally {
+      } finally {
         paragraphsToCancel.remove(paragraphId);
       }
     } else {
@@ -504,8 +503,10 @@ public abstract class BaseLivyInterpreter extends 
Interpreter {
       StringBuilder sb = new StringBuilder();
       sb.append(stmtInfo.output.evalue);
       // in case evalue doesn't have newline char
-      if (!stmtInfo.output.evalue.contains("\n"))
+      if (!stmtInfo.output.evalue.contains("\n")) {
         sb.append("\n");
+      }
+
       if (stmtInfo.output.traceback != null) {
         sb.append(StringUtils.join(stmtInfo.output.traceback));
       }
@@ -519,14 +520,14 @@ public abstract class BaseLivyInterpreter extends 
Interpreter {
       return new InterpreterResult(InterpreterResult.Code.ERROR, "Empty 
output");
     } else {
       //TODO(zjffdu) support other types of data (like json, image and etc)
-      String result = stmtInfo.output.data.plain_text;
+      String result = stmtInfo.output.data.plainText;
 
       // check table magic result first
-      if (stmtInfo.output.data.application_livy_table_json != null) {
+      if (stmtInfo.output.data.applicationLivyTableJson != null) {
         StringBuilder outputBuilder = new StringBuilder();
         boolean notFirstColumn = false;
 
-        for (Map header : 
stmtInfo.output.data.application_livy_table_json.headers) {
+        for (Map header : 
stmtInfo.output.data.applicationLivyTableJson.headers) {
           if (notFirstColumn) {
             outputBuilder.append("\t");
           }
@@ -535,15 +536,15 @@ public abstract class BaseLivyInterpreter extends 
Interpreter {
         }
 
         outputBuilder.append("\n");
-        for (List<Object> row : 
stmtInfo.output.data.application_livy_table_json.records) {
+        for (List<Object> row : 
stmtInfo.output.data.applicationLivyTableJson.records) {
           outputBuilder.append(StringUtils.join(row, "\t"));
           outputBuilder.append("\n");
         }
         return new InterpreterResult(InterpreterResult.Code.SUCCESS,
             InterpreterResult.Type.TABLE, outputBuilder.toString());
-      } else if (stmtInfo.output.data.image_png != null) {
+      } else if (stmtInfo.output.data.imagePng != null) {
         return new InterpreterResult(InterpreterResult.Code.SUCCESS,
-            InterpreterResult.Type.IMG, (String) 
stmtInfo.output.data.image_png);
+            InterpreterResult.Type.IMG, (String) 
stmtInfo.output.data.imagePng);
       } else if (result != null) {
         result = result.trim();
         if (result.startsWith("<link")
@@ -669,7 +670,8 @@ public abstract class BaseLivyInterpreter extends 
Interpreter {
         restTemplate = new RestTemplate(new 
HttpComponentsClientHttpRequestFactory(httpClient));
       }
     }
-    restTemplate.getMessageConverters().add(0, new 
StringHttpMessageConverter(Charset.forName("UTF-8")));
+    restTemplate.getMessageConverters().add(0,
+            new StringHttpMessageConverter(Charset.forName("UTF-8")));
     return restTemplate;
   }
 
@@ -769,7 +771,7 @@ public abstract class BaseLivyInterpreter extends 
Interpreter {
     public final String user;
     public final Map<String, String> conf;
 
-    public CreateSessionRequest(String kind, String user, Map<String, String> 
conf) {
+    CreateSessionRequest(String kind, String user, Map<String, String> conf) {
       this.kind = kind;
       this.user = user;
       this.conf = conf;
@@ -823,7 +825,8 @@ public abstract class BaseLivyInterpreter extends 
Interpreter {
   static class ExecuteRequest {
     public final String code;
     public final String kind;
-    public ExecuteRequest(String code, String kind) {
+
+    ExecuteRequest(String code, String kind) {
       this.code = code;
       this.kind = kind;
     }
@@ -839,22 +842,22 @@ public abstract class BaseLivyInterpreter extends 
Interpreter {
     public double progress;
     public StatementOutput output;
 
-    public StatementInfo() {
+    StatementInfo() {
     }
 
     public static StatementInfo fromJson(String json) {
-      String right_json = "";
+      String rightJson = "";
       try {
         gson.fromJson(json, StatementInfo.class);
-        right_json = json;
+        rightJson = json;
       } catch (Exception e) {
         if (json.contains("\"traceback\":{}")) {
           LOGGER.debug("traceback type mismatch, replacing the mismatching 
part ");
-          right_json = json.replace("\"traceback\":{}", "\"traceback\":[]");
-          LOGGER.debug("new json string is {}", right_json);
+          rightJson = json.replace("\"traceback\":{}", "\"traceback\":[]");
+          LOGGER.debug("new json string is {}", rightJson);
         }
       }
-      return gson.fromJson(right_json, StatementInfo.class);
+      return gson.fromJson(rightJson, StatementInfo.class);
     }
 
     public boolean isAvailable() {
@@ -867,7 +870,7 @@ public abstract class BaseLivyInterpreter extends 
Interpreter {
 
     private static class StatementOutput {
       public String status;
-      public String execution_count;
+      public String executionCount;
       public Data data;
       public String ename;
       public String evalue;
@@ -884,13 +887,13 @@ public abstract class BaseLivyInterpreter extends 
Interpreter {
 
       private static class Data {
         @SerializedName("text/plain")
-        public String plain_text;
+        public String plainText;
         @SerializedName("image/png")
-        public String image_png;
+        public String imagePng;
         @SerializedName("application/json")
-        public String application_json;
+        public String applicationJson;
         @SerializedName("application/vnd.livy.table.v1+json")
-        public TableMagic application_livy_table_json;
+        public TableMagic applicationLivyTableJson;
       }
 
       private static class TableMagic {
@@ -908,7 +911,7 @@ public abstract class BaseLivyInterpreter extends 
Interpreter {
     public final String kind;
     public final int cursor;
 
-    public CompletionRequest(String code, String kind, int cursor) {
+    CompletionRequest(String code, String kind, int cursor) {
       this.code = code;
       this.kind = kind;
       this.cursor = cursor;
@@ -922,7 +925,7 @@ public abstract class BaseLivyInterpreter extends 
Interpreter {
   static class CompletionResponse {
     public final String[] candidates;
 
-    public CompletionResponse(String[] candidates) {
+    CompletionResponse(String[] candidates) {
       this.candidates = candidates;
     }
 
@@ -943,5 +946,4 @@ public abstract class BaseLivyInterpreter extends 
Interpreter {
       return gson.fromJson(json, LivyVersionResponse.class);
     }
   }
-
 }

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0a47b139/livy/src/main/java/org/apache/zeppelin/livy/LivyException.java
----------------------------------------------------------------------
diff --git a/livy/src/main/java/org/apache/zeppelin/livy/LivyException.java 
b/livy/src/main/java/org/apache/zeppelin/livy/LivyException.java
index e126a0f..c14351f 100644
--- a/livy/src/main/java/org/apache/zeppelin/livy/LivyException.java
+++ b/livy/src/main/java/org/apache/zeppelin/livy/LivyException.java
@@ -20,7 +20,7 @@ package org.apache.zeppelin.livy;
 import org.apache.zeppelin.interpreter.InterpreterException;
 
 /**
- * Livy api related exception
+ * Livy api related exception.
  */
 public class LivyException extends InterpreterException {
   public LivyException() {

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0a47b139/livy/src/main/java/org/apache/zeppelin/livy/LivyPySparkBaseInterpreter.java
----------------------------------------------------------------------
diff --git 
a/livy/src/main/java/org/apache/zeppelin/livy/LivyPySparkBaseInterpreter.java 
b/livy/src/main/java/org/apache/zeppelin/livy/LivyPySparkBaseInterpreter.java
index 6d39981..32399c6 100644
--- 
a/livy/src/main/java/org/apache/zeppelin/livy/LivyPySparkBaseInterpreter.java
+++ 
b/livy/src/main/java/org/apache/zeppelin/livy/LivyPySparkBaseInterpreter.java
@@ -15,13 +15,12 @@
  * limitations under the License.
  */
 
-
 package org.apache.zeppelin.livy;
 
 import java.util.Properties;
 
 /**
- * Base class for PySpark Interpreter
+ * Base class for PySpark Interpreter.
  */
 public abstract class LivyPySparkBaseInterpreter extends BaseLivyInterpreter {
 

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0a47b139/livy/src/main/java/org/apache/zeppelin/livy/LivySharedInterpreter.java
----------------------------------------------------------------------
diff --git 
a/livy/src/main/java/org/apache/zeppelin/livy/LivySharedInterpreter.java 
b/livy/src/main/java/org/apache/zeppelin/livy/LivySharedInterpreter.java
index cef0858..c912dc9 100644
--- a/livy/src/main/java/org/apache/zeppelin/livy/LivySharedInterpreter.java
+++ b/livy/src/main/java/org/apache/zeppelin/livy/LivySharedInterpreter.java
@@ -18,17 +18,18 @@
 package org.apache.zeppelin.livy;
 
 import org.apache.commons.lang.StringUtils;
-import org.apache.zeppelin.interpreter.InterpreterContext;
-import org.apache.zeppelin.interpreter.InterpreterException;
-import org.apache.zeppelin.interpreter.InterpreterResult;
-import org.apache.zeppelin.interpreter.InterpreterUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.util.Properties;
 
+import org.apache.zeppelin.interpreter.InterpreterContext;
+import org.apache.zeppelin.interpreter.InterpreterException;
+import org.apache.zeppelin.interpreter.InterpreterResult;
+import org.apache.zeppelin.interpreter.InterpreterUtils;
+
 /**
- * Livy Interpreter for shared kind which share SparkContext across 
spark/pyspark/r
+ * Livy Interpreter for shared kind which share SparkContext across 
spark/pyspark/r.
  */
 public class LivySharedInterpreter extends BaseLivyInterpreter {
 

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0a47b139/livy/src/main/java/org/apache/zeppelin/livy/LivySparkSQLInterpreter.java
----------------------------------------------------------------------
diff --git 
a/livy/src/main/java/org/apache/zeppelin/livy/LivySparkSQLInterpreter.java 
b/livy/src/main/java/org/apache/zeppelin/livy/LivySparkSQLInterpreter.java
index 2faa350..902336b 100644
--- a/livy/src/main/java/org/apache/zeppelin/livy/LivySparkSQLInterpreter.java
+++ b/livy/src/main/java/org/apache/zeppelin/livy/LivySparkSQLInterpreter.java
@@ -17,24 +17,34 @@
 
 package org.apache.zeppelin.livy;
 
-import org.apache.commons.lang.StringUtils;
 import static org.apache.commons.lang.StringEscapeUtils.escapeJavaScript;
-import org.apache.zeppelin.display.GUI;
-import org.apache.zeppelin.interpreter.*;
-import org.apache.zeppelin.scheduler.Scheduler;
-import org.apache.zeppelin.scheduler.SchedulerFactory;
-import org.apache.zeppelin.user.AuthenticationInfo;
+
+import org.apache.commons.lang.StringUtils;
 
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Properties;
 
+import org.apache.zeppelin.display.GUI;
+import org.apache.zeppelin.interpreter.Interpreter;
+import org.apache.zeppelin.interpreter.InterpreterContext;
+import org.apache.zeppelin.interpreter.InterpreterException;
+import org.apache.zeppelin.interpreter.InterpreterOutput;
+import org.apache.zeppelin.interpreter.InterpreterResult;
+import org.apache.zeppelin.interpreter.InterpreterResultMessage;
+import org.apache.zeppelin.interpreter.InterpreterUtils;
+import org.apache.zeppelin.interpreter.LazyOpenInterpreter;
+import org.apache.zeppelin.interpreter.ResultMessages;
+import org.apache.zeppelin.interpreter.WrappedInterpreter;
+import org.apache.zeppelin.scheduler.Scheduler;
+import org.apache.zeppelin.scheduler.SchedulerFactory;
+import org.apache.zeppelin.user.AuthenticationInfo;
+
 /**
  * Livy SparkSQL Interpreter for Zeppelin.
  */
 public class LivySparkSQLInterpreter extends BaseLivyInterpreter {
-
   public static final String ZEPPELIN_LIVY_SPARK_SQL_FIELD_TRUNCATE =
       "zeppelin.livy.spark.sql.field.truncate";
 
@@ -230,12 +240,13 @@ public class LivySparkSQLInterpreter extends 
BaseLivyInterpreter {
   }
 
   /**
-   * Represent the start and end index of each cell
+   * Represent the start and end index of each cell.
    */
   private static class Pair {
     private int start;
     private int end;
-    public Pair(int start, int end) {
+
+    Pair(int start, int end) {
       this.start = start;
       this.end = end;
     }

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0a47b139/livy/src/main/java/org/apache/zeppelin/livy/LivyVersion.java
----------------------------------------------------------------------
diff --git a/livy/src/main/java/org/apache/zeppelin/livy/LivyVersion.java 
b/livy/src/main/java/org/apache/zeppelin/livy/LivyVersion.java
index 81bb8d4..55ebd57 100644
--- a/livy/src/main/java/org/apache/zeppelin/livy/LivyVersion.java
+++ b/livy/src/main/java/org/apache/zeppelin/livy/LivyVersion.java
@@ -21,7 +21,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * Provide reading comparing capability of livy version
+ * Provide reading comparing capability of livy version.
  */
 public class LivyVersion {
   private static final Logger logger = 
LoggerFactory.getLogger(LivyVersion.class);

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0a47b139/livy/src/test/java/org/apache/zeppelin/livy/LivyInterpreterIT.java
----------------------------------------------------------------------
diff --git a/livy/src/test/java/org/apache/zeppelin/livy/LivyInterpreterIT.java 
b/livy/src/test/java/org/apache/zeppelin/livy/LivyInterpreterIT.java
index c7fbc8d..5deb52d 100644
--- a/livy/src/test/java/org/apache/zeppelin/livy/LivyInterpreterIT.java
+++ b/livy/src/test/java/org/apache/zeppelin/livy/LivyInterpreterIT.java
@@ -17,21 +17,13 @@
 
 package org.apache.zeppelin.livy;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.mock;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.livy.test.framework.Cluster;
 import org.apache.livy.test.framework.Cluster$;
-import org.apache.zeppelin.interpreter.Interpreter;
-import org.apache.zeppelin.interpreter.InterpreterContext;
-import org.apache.zeppelin.interpreter.InterpreterException;
-import org.apache.zeppelin.interpreter.InterpreterGroup;
-import org.apache.zeppelin.interpreter.InterpreterOutput;
-import org.apache.zeppelin.interpreter.InterpreterOutputListener;
-import org.apache.zeppelin.interpreter.InterpreterResult;
-import org.apache.zeppelin.interpreter.InterpreterResultMessage;
-import org.apache.zeppelin.interpreter.InterpreterResultMessageOutput;
-import org.apache.zeppelin.interpreter.LazyOpenInterpreter;
-import org.apache.zeppelin.user.AuthenticationInfo;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Test;
@@ -42,13 +34,19 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Properties;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
-import static org.mockito.Mockito.mock;
+import org.apache.zeppelin.interpreter.Interpreter;
+import org.apache.zeppelin.interpreter.InterpreterContext;
+import org.apache.zeppelin.interpreter.InterpreterException;
+import org.apache.zeppelin.interpreter.InterpreterGroup;
+import org.apache.zeppelin.interpreter.InterpreterOutput;
+import org.apache.zeppelin.interpreter.InterpreterOutputListener;
+import org.apache.zeppelin.interpreter.InterpreterResult;
+import org.apache.zeppelin.interpreter.InterpreterResultMessageOutput;
+import org.apache.zeppelin.interpreter.LazyOpenInterpreter;
+import org.apache.zeppelin.user.AuthenticationInfo;
 
 public class LivyInterpreterIT {
-
-  private static Logger LOGGER = 
LoggerFactory.getLogger(LivyInterpreterIT.class);
+  private static final Logger LOGGER = 
LoggerFactory.getLogger(LivyInterpreterIT.class);
   private static Cluster cluster;
   private static Properties properties;
 
@@ -313,16 +311,18 @@ public class LivyInterpreterIT {
     // test result string truncate
     if (!isSpark2) {
       result = sparkInterpreter.interpret(
-          "val 
df=sqlContext.createDataFrame(Seq((\"12characters12characters\",20))).toDF(\"col_1\",
 \"col_2\")\n"
-              + "df.collect()", context);
+          "val 
df=sqlContext.createDataFrame(Seq((\"12characters12characters\",20)))"
+                  + ".toDF(\"col_1\", \"col_2\")\n"
+                  + "df.collect()", context);
       assertEquals(InterpreterResult.Code.SUCCESS, result.code());
       assertEquals(1, result.message().size());
       assertTrue(result.message().get(0).getData()
           .contains("Array[org.apache.spark.sql.Row] = 
Array([12characters12characters,20])"));
     } else {
       result = sparkInterpreter.interpret(
-          "val 
df=spark.createDataFrame(Seq((\"12characters12characters\",20))).toDF(\"col_1\",
 \"col_2\")\n"
-              + "df.collect()", context);
+          "val 
df=spark.createDataFrame(Seq((\"12characters12characters\",20)))"
+                  + ".toDF(\"col_1\", \"col_2\")\n"
+                  + "df.collect()", context);
       assertEquals(InterpreterResult.Code.SUCCESS, result.code());
       assertEquals(1, result.message().size());
       assertTrue(result.message().get(0).getData()
@@ -330,7 +330,8 @@ public class LivyInterpreterIT {
     }
     sparkInterpreter.interpret("df.registerTempTable(\"df\")", context);
     // test LivySparkSQLInterpreter which share the same SparkContext with 
LivySparkInterpreter
-    result = sqlInterpreter.interpret("select * from df where 
col_1='12characters12characters'", context);
+    result = sqlInterpreter.interpret("select * from df where 
col_1='12characters12characters'",
+            context);
     assertEquals(InterpreterResult.Code.SUCCESS, result.code());
     assertEquals(InterpreterResult.Type.TABLE, 
result.message().get(0).getType());
     assertEquals("col_1\tcol_2\n12characters12cha...\t20", 
result.message().get(0).getData());
@@ -348,22 +349,24 @@ public class LivyInterpreterIT {
     AuthenticationInfo authInfo = new AuthenticationInfo("user1");
     MyInterpreterOutputListener outputListener = new 
MyInterpreterOutputListener();
     InterpreterOutput output = new InterpreterOutput(outputListener);
-    final InterpreterContext context = new InterpreterContext("noteId", 
"paragraphId", "livy.pyspark",
-        "title", "text", authInfo, null, null, null, null, null, null, output);
+    final InterpreterContext context = new InterpreterContext("noteId", 
"paragraphId",
+            "livy.pyspark", "title", "text", authInfo, null, null, null, null, 
null, null, output);
     pysparkInterpreter.open();
 
     // test traceback msg
     try {
       pysparkInterpreter.getLivyVersion();
-      // for livy version >=0.3 , input some erroneous spark code, check the 
shown result is more than one line
-      InterpreterResult result = 
pysparkInterpreter.interpret("sc.parallelize(wrongSyntax(1, 2)).count()", 
context);
+      // for livy version >=0.3 , input some erroneous spark code, check the 
shown result is more
+      // than one line
+      InterpreterResult result = pysparkInterpreter.interpret(
+              "sc.parallelize(wrongSyntax(1, 2)).count()", context);
       assertEquals(InterpreterResult.Code.ERROR, result.code());
       assertTrue(result.message().get(0).getData().split("\n").length > 1);
       assertTrue(result.message().get(0).getData().contains("Traceback"));
     } catch (APINotFoundException e) {
       // only livy 0.2 can throw this exception since it doesn't have /version 
endpoint
-      // in livy 0.2, most error msg is encapsulated in evalue field, only 
print(a) in pyspark would return none-empty
-      // traceback
+      // in livy 0.2, most error msg is encapsulated in evalue field, only 
print(a) in pyspark would
+      // return none-empty traceback
       InterpreterResult result = pysparkInterpreter.interpret("print(a)", 
context);
       assertEquals(InterpreterResult.Code.ERROR, result.code());
       assertTrue(result.message().get(0).getData().split("\n").length > 1);
@@ -461,7 +464,8 @@ public class LivyInterpreterIT {
   }
 
   @Test
-  public void testSparkInterpreterWithDisplayAppInfo_StringWithoutTruncation() 
throws InterpreterException {
+  public void testSparkInterpreterWithDisplayAppInfo_StringWithoutTruncation()
+          throws InterpreterException {
     if (!checkPreCondition()) {
       return;
     }
@@ -509,16 +513,18 @@ public class LivyInterpreterIT {
 
       if (!isSpark2) {
         result = sparkInterpreter.interpret(
-            "val 
df=sqlContext.createDataFrame(Seq((\"12characters12characters\",20))).toDF(\"col_1\",
 \"col_2\")\n"
-                + "df.collect()", context);
+            "val 
df=sqlContext.createDataFrame(Seq((\"12characters12characters\",20)))"
+                    + ".toDF(\"col_1\", \"col_2\")\n"
+                    + "df.collect()", context);
         assertEquals(InterpreterResult.Code.SUCCESS, result.code());
         assertEquals(2, result.message().size());
         assertTrue(result.message().get(0).getData()
             .contains("Array[org.apache.spark.sql.Row] = 
Array([12characters12characters,20])"));
       } else {
         result = sparkInterpreter.interpret(
-            "val 
df=spark.createDataFrame(Seq((\"12characters12characters\",20))).toDF(\"col_1\",
 \"col_2\")\n"
-                + "df.collect()", context);
+            "val 
df=spark.createDataFrame(Seq((\"12characters12characters\",20)))"
+                    + ".toDF(\"col_1\", \"col_2\")\n"
+                    + "df.collect()", context);
         assertEquals(InterpreterResult.Code.SUCCESS, result.code());
         assertEquals(2, result.message().size());
         assertTrue(result.message().get(0).getData()
@@ -526,7 +532,8 @@ public class LivyInterpreterIT {
       }
       sparkInterpreter.interpret("df.registerTempTable(\"df\")", context);
       // test LivySparkSQLInterpreter which share the same SparkContext with 
LivySparkInterpreter
-      result = sqlInterpreter.interpret("select * from df where 
col_1='12characters12characters'", context);
+      result = sqlInterpreter.interpret("select * from df where 
col_1='12characters12characters'",
+              context);
       assertEquals(InterpreterResult.Code.SUCCESS, result.code());
       assertEquals(InterpreterResult.Type.TABLE, 
result.message().get(0).getType());
       assertEquals("col_1\tcol_2\n12characters12characters\t20", 
result.message().get(0).getData());
@@ -554,8 +561,8 @@ public class LivyInterpreterIT {
     AuthenticationInfo authInfo = new AuthenticationInfo("user1");
     MyInterpreterOutputListener outputListener = new 
MyInterpreterOutputListener();
     InterpreterOutput output = new InterpreterOutput(outputListener);
-    final InterpreterContext context = new InterpreterContext("noteId", 
"paragraphId", "livy.sparkr",
-        "title", "text", authInfo, null, null, null, null, null, null, output);
+    final InterpreterContext context = new InterpreterContext("noteId", 
"paragraphId",
+            "livy.sparkr", "title", "text", authInfo, null, null, null, null, 
null, null, output);
     sparkRInterpreter.open();
 
     try {
@@ -695,7 +702,8 @@ public class LivyInterpreterIT {
       assertEquals(InterpreterResult.Code.SUCCESS, result.code());
       assertEquals(1, result.message().size());
 
-      boolean isSpark2 = isSpark2((BaseLivyInterpreter) 
sparkInterpreter.getInnerInterpreter(), context);
+      boolean isSpark2 = isSpark2((BaseLivyInterpreter) 
sparkInterpreter.getInnerInterpreter(),
+              context);
 
       if (!isSpark2) {
         result = sparkInterpreter.interpret(
@@ -708,7 +716,8 @@ public class LivyInterpreterIT {
         sparkInterpreter.interpret("df.registerTempTable(\"df\")", context);
 
         // access table from pyspark
-        result = pysparkInterpreter.interpret("sqlContext.sql(\"select * from 
df\").show()", context);
+        result = pysparkInterpreter.interpret("sqlContext.sql(\"select * from 
df\").show()",
+                context);
         assertEquals(InterpreterResult.Code.SUCCESS, result.code());
         assertEquals(1, result.message().size());
         assertTrue(result.message().get(0).getData()
@@ -719,7 +728,8 @@ public class LivyInterpreterIT {
                 "+-----+-----+"));
 
         // access table from sparkr
-        result = sparkRInterpreter.interpret("head(sql(sqlContext, \"select * 
from df\"))", context);
+        result = sparkRInterpreter.interpret("head(sql(sqlContext, \"select * 
from df\"))",
+                context);
         assertEquals(InterpreterResult.Code.SUCCESS, result.code());
         assertEquals(1, result.message().size());
         assertTrue(result.message().get(0).getData().contains("col_1 col_2\n1 
hello    20"));

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/0a47b139/livy/src/test/java/org/apache/zeppelin/livy/LivySQLInterpreterTest.java
----------------------------------------------------------------------
diff --git 
a/livy/src/test/java/org/apache/zeppelin/livy/LivySQLInterpreterTest.java 
b/livy/src/test/java/org/apache/zeppelin/livy/LivySQLInterpreterTest.java
index 0541b87..8821a86 100644
--- a/livy/src/test/java/org/apache/zeppelin/livy/LivySQLInterpreterTest.java
+++ b/livy/src/test/java/org/apache/zeppelin/livy/LivySQLInterpreterTest.java
@@ -15,19 +15,20 @@
  * limitations under the License.
  */
 
-
 package org.apache.zeppelin.livy;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertTrue;
+
 import org.junit.Before;
-import org.junit.BeforeClass;
 import org.junit.Test;
 
 import java.util.List;
 import java.util.Properties;
-import static org.junit.Assert.*;
 
 /**
- * Unit test for LivySQLInterpreter
+ * Unit test for LivySQLInterpreter.
  */
 public class LivySQLInterpreterTest {
 
@@ -126,7 +127,8 @@ public class LivySQLInterpreterTest {
     assertEquals("1", rows.get(1));
 
 
-    //  sql output with 3 rows, 3 columns, showing "only showing top 3 rows" 
with a line break in the data
+    //  sql output with 3 rows, 3 columns, showing "only showing top 3 rows" 
with a line break in
+    //  the data
     //    +---+---+---+
     //    |  a|  b|  c|
     //    +---+---+---+

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