I am also getting errors while generating the input dataset as per the following command from here ( https://cwiki.apache.org/MAHOUT/twenty-newsgroups.html ): $ mkdir 20news-input $ mvn -e exec:java \ -Dexec.mainClass=org.apache.mahout.classifier.bayes.PrepareTwentyNewsgroups \ -Dexec.args="-p 20news-18828 \ -o 20news-input \ -a org.apache.lucene.analysis.standard.StandardAnalyzer \ -c UTF-8"
The error I am getting is pated below: > >[INFO] [exec:java] >[INFO] ------------------------------------------------------------------------ >[ERROR] BUILD ERROR >[INFO] ------------------------------------------------------------------------ >[INFO] An exception occured while executing the Java class. >org.apache.mahout.classifier.bayes.PrepareTwentyNewsgroups > > >[INFO] ------------------------------------------------------------------------ >[INFO] Trace >org.apache.maven.lifecycle.LifecycleExecutionException: An exception occured >while executing the Java class. >org.apache.mahout.classifier.bayes.PrepareTwentyNewsgroups >at >org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:583) > >at >org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:512) > >at >org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:482) > >at >org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:330) > >at >org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:291) > >at >org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:142) > >at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336) >at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129) >at org.apache.maven.cli.MavenCli.main(MavenCli.java:287) >at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) >at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) >at >sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > >at java.lang.reflect.Method.invoke(Method.java:597) >at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315) >at org.codehaus.classworlds.Launcher.launch(Launcher.java:255) >at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430) >at org.codehaus.classworlds.Launcher.main(Launcher.java:375) >Caused by: org.apache.maven.plugin.MojoExecutionException: An exception >occured >while executing the Java class. >org.apache.mahout.classifier.bayes.PrepareTwentyNewsgroups >at org.codehaus.mojo.exec.ExecJavaMojo.execute(ExecJavaMojo.java:346) >at >org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:451) > >at >org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:558) > >... 16 more >Caused by: java.lang.ClassNotFoundException: >org.apache.mahout.classifier.bayes.PrepareTwentyNewsgroups >at java.net.URLClassLoader$1.run(URLClassLoader.java:200) >at java.security.AccessController.doPrivileged(Native Method) >at java.net.URLClassLoader.findClass(URLClassLoader.java:188) >at java.lang.ClassLoader.loadClass(ClassLoader.java:307) >at java.lang.ClassLoader.loadClass(ClassLoader.java:252) >at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:284) >at java.lang.Thread.run(Thread.java:619) > > Any idea why this is happening? Appreciate any help. Thanks Bhaskar Ghosh Hyderabad, India http://www.google.com/profiles/bjgindia "Ignorance is Bliss... Knowledge never brings Peace!!!" ________________________________ From: Neil Ghosh <[email protected]> To: Ted Dunning <[email protected]> Cc: [email protected] Sent: Tue, 21 September, 2010 11:58:41 PM Subject: Re: Build Error in Twenty Newsgroups Classification Example Thanks Ted. I just found that my [mvn install] on the root directory had completed with error before trying this . Then I did "cd" to "core" and "examples" and compiled and installed.Both were successful. After that this command ran fine and I could run the example. On Tue, Sep 21, 2010 at 11:51 PM, Ted Dunning <[email protected]> wrote: > Did you do [mvn -DskipTests install] at the top level before trying this? > > > On Tue, Sep 21, 2010 at 9:15 AM, Neil Ghosh <[email protected]> wrote: > >> Hi , >> >> I am trying to run the example using Mahout 0.3 at >> https://cwiki.apache.org/confluence/display/MAHOUT/Twenty+Newsgroups >> >> I have carried out all the steps but getting build error during this >> command >> >> mvn -e exec:java \ >> >> -Dexec.mainClass=org.apache.mahout.classifier.bayes.PrepareTwentyNewsgroups >> \ >> -Dexec.args="-p 20news-18828 \ >> -o 20news-input \ >> -a org.apache.lucene.analysis.standard.StandardAnalyzer >> \ >> -c UTF-8" >> >> >> Please help, getting the following error. >> >> n...@neil-laptop:~/workspace/mahout-0.3/examples$ mvn -e exec:java \ >> > >> >> -Dexec.mainClass=org.apache.mahout.classifier.bayes.PrepareTwentyNewsgroups >> \ >> > -Dexec.args="-p 20news-18828 \ >> > -o 20news-input \ >> > -a >> org.apache.lucene.analysis.standard.StandardAnalyzer >> \ >> > -c UTF-8" >> + Error stacktraces are turned on. >> [INFO] Scanning for projects... >> [INFO] Searching repository for plugin with prefix: 'exec'. >> [INFO] >> ------------------------------------------------------------------------ >> [INFO] Building Mahout Examples >> [INFO] task-segment: [exec:java] >> [INFO] >> ------------------------------------------------------------------------ >> [INFO] Preparing exec:java >> [INFO] No goals needed for project - skipping >> [INFO] [exec:java {execution: default-cli}] >> [INFO] >> ------------------------------------------------------------------------ >> [ERROR] BUILD ERROR >> [INFO] >> ------------------------------------------------------------------------ >> [INFO] An exception occured while executing the Java class. null >> >> Unresolved compilation problems: >> DefaultOptionCreator cannot be resolved >> CommandLineUtil cannot be resolved >> BayesFileFormatter cannot be resolved >> CommandLineUtil cannot be resolved >> >> [INFO] >> ------------------------------------------------------------------------ >> [INFO] Trace >> org.apache.maven.lifecycle.LifecycleExecutionException: An exception >> occured >> while executing the Java class. null >> at >> >>org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:719) >>) >> at >> >>org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:569) >>) >> at >> >>org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:539) >>) >> at >> >>org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387) >>) >> at >> >>org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348) >>) >> at >> >>org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180) >>) >> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328) >> at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138) >> at org.apache.maven.cli.MavenCli.main(MavenCli.java:362) >> at >> org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60) >> 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:616) >> at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315) >> at org.codehaus.classworlds.Launcher.launch(Launcher.java:255) >> at >> org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430) >> at org.codehaus.classworlds.Launcher.main(Launcher.java:375) >> Caused by: org.apache.maven.plugin.MojoExecutionException: An exception >> occured while executing the Java class. null >> at org.codehaus.mojo.exec.ExecJavaMojo.execute(ExecJavaMojo.java:346) >> at >> >>org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490) >>) >> at >> >>org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694) >>) >> ... 17 more >> Caused by: 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:616) >> at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:291) >> at java.lang.Thread.run(Thread.java:636) >> Caused by: java.lang.Error: Unresolved compilation problems: >> DefaultOptionCreator cannot be resolved >> CommandLineUtil cannot be resolved >> BayesFileFormatter cannot be resolved >> CommandLineUtil cannot be resolved >> >> at >> >>org.apache.mahout.classifier.bayes.PrepareTwentyNewsgroups.main(PrepareTwentyNewsgroups.java:52) >>) >> ... 6 more >> [INFO] >> ------------------------------------------------------------------------ >> [INFO] Total time: 3 seconds >> [INFO] Finished at: Tue Sep 21 21:41:25 IST 2010 >> [INFO] Final Memory: 14M/34M >> [INFO] >> ------------------------------------------------------------------------ >> >> >> >> -- >> Thanks and Regards >> Neil >> http://neilghosh.com >> > > -- Thanks and Regards Neil http://neilghosh.com Hello All,
