Hi i need to find whether particular column qualifier present in column family so i did code like this
As per document public boolean containsColumn(byte[] family, byte[] qualifier) Checks for existence of a value for the specified column (empty or not). Parameters:family - family namequalifier - column qualifierReturns:true if at least one value exists in the result, false if not ////////////////////////// //my code//////////// public static boolean search_column(String mail) throws IOException { HTable testTable = new HTable(frinds_util.get_config(), "people");//configuration byte[] email_b=Bytes.toBytes(mail);//column qulifier byte[] colmnfamily=Bytes.toBytes("colmn_fam");//column family Scan scan_col=new Scan (Bytes.toBytes("colmn_fam"),email_b); ResultScanner results = testTable.getScanner(scan_col); Result result = results.next(); if(result.containsColumn(colmnfamily, email_b))//check whether column presernt { System.out.println("column is present"); ret=true; } return ret; } my build is failed with below o/p java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:293) at java.lang.Thread.run(Thread.java:724) Caused by: java.lang.NullPointerException at org.freinds_rep.java.Insert_friend.search_column(Insert_friend.java:106) at org.freinds_rep.java.Insert_friend.main(Insert_friend.java:156) ... 6 more [WARNING] thread Thread[org.freinds_rep.java.Insert_friend.main( 127.0.0.1:2181),5,org.freinds_rep.java.Insert_friend] was interrupted but is still alive after waiting at least 15000msecs [WARNING] thread Thread[org.freinds_rep.java.Insert_friend.main( 127.0.0.1:2181),5,org.freinds_rep.java.Insert_friend] will linger despite being asked to die via interruption [WARNING] NOTE: 1 thread(s) did not finish despite being asked to via interruption. This is not a problem with exec:java, it is a problem with the running code. Although not serious, it should be remedied. [WARNING] Couldn't destroy threadgroup org.codehaus.mojo.exec.ExecJavaMojo$IsolatedThreadGroup[name=org.freinds_rep.java.Insert_friend,maxpri=10] java.lang.IllegalThreadStateException at java.lang.ThreadGroup.destroy(ThreadGroup.java:775) at org.codehaus.mojo.exec.ExecJavaMojo.execute(ExecJavaMojo.java:328) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59) at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196) at org.apache.maven.cli.MavenCli.main(MavenCli.java:141) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352) [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 1:23.294s [INFO] Finished at: Wed Nov 19 09:08:48 PST 2014 [INFO] Final Memory: 10M/137M Any idea how to solve this?