which seemed to result in a null pointer exception.
3450 !ENTRY org.eclipse.core.resources 4 75 2012-08-29 17:52:37.351
3451 !MESSAGE Errors occurred during the build.
3452 !SUBENTRY 1 org.eclipse.m2e.core 4 75 2012-08-29 17:52:37.351
3453 !MESSAGE Errors running builder 'Maven Project Builder' on project 'project1'.
3454 !STACK 0
3455 java.lang.NullPointerException
3456 at org.eclipse.m2e.core.internal.lifecyclemapping.model.PluginExecutionFilter.match(PluginExecutionFilter.java:323)
3457 at org.eclipse.m2e.core.internal.lifecyclemapping.SimpleMappingMetadata Source.getPluginExecutionMetadata(SimpleMappingMetadataSource.java:71)
3458 at org.eclipse.m2e.core.internal.lifecyclemapping.LifecycleMappingFactory.calculateEffectiveLifecycleMappingMetadata(LifecycleMappingFactory.java: 490)
3459 at org.eclipse.m2e.core.internal.lifecyclemapping.LifecycleMappingFactory.calculateEffectiveLifecycleMappingMetadata(LifecycleMappingFactory.java: 224)
3460 at org.eclipse.m2e.core.internal.lifecyclemapping.LifecycleMappingFactory.calculateLifecycleMapping(LifecycleMappingFactory.java:175)
3461 at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.setupLifecycleMapping(ProjectRegistryManager.java:527)
3462 at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.refresh(ProjectRegistryManager.java:446)
3463 at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.refresh(ProjectRegistryManager.java:328)
3464 at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.refresh(ProjectRegistryManager.java:279)
3465 at org.eclipse.m2e.core.internal.project.registry.MavenProjectManager.refresh(MavenProjectManager.java:58)
3466 at org.eclipse.m2e.core.internal.builder.MavenBuilder.build(MavenBuilder.java:87)
3467 at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:728)
3468 at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
3469 at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)
3470 at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239)
3471 at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292)
3472 at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
3473 at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295)
3474 at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351)
3475 at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374)
3476 at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)
3477 at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)
3478 at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
I tried adding the groupId and artifactId to the lifecycle mapping declaration but don't know that it helped... I haven't been able to reproduce the NPE or resolve the complaints about lack of lifecycle information in the POM editor...