The error below happens when a parent project is built and within it it has a
profile that is activated by a 1.5 jdk. This profile, when activated, adds a
module to the build. There is nothing special about the sub module. The error
does not happen when the activator is set to 1.6, or the project is built with
1.6 (profile does not activate), or the activator is set to 1.6 and the project
is built with 1.6.

Hudson 1.330
Maven Integration plugin 1.330

Sample output:
[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] reporters.get(com.example:example-a)==null.
reporters=

{com.example:example-parent=[hudson.maven.reporters.BuildInfoRecorder@14d8a08, hudson.maven.reporters.MavenSiteArchiver@1a1472d, hudson.maven.reporters.MavenJavadocArchiver@147ff11, hudson.maven.reporters.MavenArtifactArchiver@1bae5f5, hudson.maven.reporters.SurefireArchiver@14f7121, hudson.maven.reporters.MavenFingerprinter@8c5a4f]}

proxies=

{com.example:example-parent=hudson.maven.MavenModuleSetBuild$Builder$FilterImpl@7d093a}

[INFO] ------------------------------------------------------------------------
[INFO] Trace
java.lang.AssertionError: reporters.get(com.example:example-a)==null.
reporters=

{com.example:example-parent=[hudson.maven.reporters.BuildInfoRecorder@14d8a08, hudson.maven.reporters.MavenSiteArchiver@1a1472d, hudson.maven.reporters.MavenJavadocArchiver@147ff11, hudson.maven.reporters.MavenArtifactArchiver@1bae5f5, hudson.maven.reporters.SurefireArchiver@14f7121, hudson.maven.reporters.MavenFingerprinter@8c5a4f]}

proxies=

{com.example:example-parent=hudson.maven.MavenModuleSetBuild$Builder$FilterImpl@7d093a}

at
hudson.maven.MavenModuleSetBuild$Builder.postModule(MavenModuleSetBuild.java:718)
at hudson.maven.MavenBuilder$Adapter.fireLeaveModule(MavenBuilder.java:304)
at hudson.maven.MavenBuilder$Adapter.postBuild(MavenBuilder.java:262)
at
org.apache.maven.lifecycle.LifecycleExecutorInterceptor.execute(LifecycleExecutorInterceptor.java:68)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:301)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at hudson.maven.agent.Main.launch(Main.java:165)
at hudson.maven.MavenBuilder.call(MavenBuilder.java:159)
at hudson.maven.MavenModuleSetBuild$Builder.call(MavenModuleSetBuild.java:688)
at hudson.maven.MavenModuleSetBuild$Builder.call(MavenModuleSetBuild.java:634)
at hudson.remoting.UserRequest.perform(UserRequest.java:104)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:244)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
at java.util.concurrent.FutureTask.run(FutureTask.java:123)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:651)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:676)
at java.lang.Thread.run(Thread.java:595)