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https://issues.apache.org/jira/browse/MNG-6649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16830676#comment-16830676
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Kunal commented on MNG-6649:
----------------------------


{code:xml}
<build>
    <sourceDirectory>src</sourceDirectory>
  </build>
{code}

This fixed the problem, but not sure how it worked on earlier version of maven 
in that case. Also I am not sure I fully understand your comment about 
`targetDirectory`. Pardon for my limited knowledge about maven, but we want to 
generate classes/jars in a different directory as part of build system and 
hence we use the `targetDirectory` variable that gets set into `directory` 
property. I tried moving `targetDirectory` into the project/properties section 
but the override doesn't seem to work. The jars are now getting created inside 
`Java\target` folder next to the `src` folder. Any idea?

> Duplicate class error in maven-compiler-plugin
> ----------------------------------------------
>
>                 Key: MNG-6649
>                 URL: https://issues.apache.org/jira/browse/MNG-6649
>             Project: Maven
>          Issue Type: Bug
>          Components: Plugins and Lifecycle
>    Affects Versions: 3.6.1
>         Environment: maven version 3.6.1
> OpenJDK8 installed using choco's zulu8 package.
>            Reporter: Kunal
>            Priority: Trivial
>         Attachments: repro.zip
>
>
> When trying to run `mvn package` the `maven-compiler-plugin` fails with maven 
> 3.6.1 with below errors. It works with maven's 3.6.0.
> {noformat}
> [ERROR] <folder>/AccessStep.java:[12,8] duplicate class: 
> com.microsoft.programSynthesis.wrangling.json.jPathStep.AccessStep
> [ERROR] -> [Help 1]
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute 
> goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile 
> (default-compile) on project dsl: Compilation failure
>  at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:215)
>  at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:156)
>  at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:148)
>  at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
> (LifecycleModuleBuilder.java:117)
>  at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
> (LifecycleModuleBuilder.java:81)
>  at 
> org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
>  (SingleThreadedBuilder.java:56)
>  at org.apache.maven.lifecycle.internal.LifecycleStarter.execute 
> (LifecycleStarter.java:128)
>  at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
>  at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
>  at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
>  at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
>  at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
>  at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
>  at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
>  at sun.reflect.NativeMethodAccessorImpl.invoke 
> (NativeMethodAccessorImpl.java:62)
>  at sun.reflect.DelegatingMethodAccessorImpl.invoke 
> (DelegatingMethodAccessorImpl.java:43)
>  at java.lang.reflect.Method.invoke (Method.java:498)
>  at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced 
> (Launcher.java:282)
>  at org.codehaus.plexus.classworlds.launcher.Launcher.launch 
> (Launcher.java:225)
>  at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode 
> (Launcher.java:406)
>  at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
> Caused by: org.apache.maven.plugin.compiler.CompilationFailureException: 
> Compilation failure
>  at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute 
> (AbstractCompilerMojo.java:858)
>  at org.apache.maven.plugin.compiler.CompilerMojo.execute 
> (CompilerMojo.java:129)
>  at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo 
> (DefaultBuildPluginManager.java:137)
>  at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:210)
>  at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:156)
>  at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
> (MojoExecutor.java:148)
>  at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
> (LifecycleModuleBuilder.java:117)
>  at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
> (LifecycleModuleBuilder.java:81)
>  at 
> org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
>  (SingleThreadedBuilder.java:56)
>  at org.apache.maven.lifecycle.internal.LifecycleStarter.execute 
> (LifecycleStarter.java:128)
>  at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
>  at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
>  at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
>  at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
>  at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
>  at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
>  at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
>  at sun.reflect.NativeMethodAccessorImpl.invoke 
> (NativeMethodAccessorImpl.java:62)
>  at sun.reflect.DelegatingMethodAccessorImpl.invoke 
> (DelegatingMethodAccessorImpl.java:43)
>  at java.lang.reflect.Method.invoke (Method.java:498)
>  at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced 
> (Launcher.java:282)
>  at org.codehaus.plexus.classworlds.launcher.Launcher.launch 
> (Launcher.java:225)
>  at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode 
> (Launcher.java:406)
>  at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
> {noformat}



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