Got this exception, on solaris10/sparc NB 6.0 nightly 200706180000 & jdk 1.6u1
was obliged to close the IDE window no way to reach any xterm opened in my desktop when this happened.

not sure if ejb is the suitable subcomponent.

SEVERE [global]
java.lang.NullPointerException
	at
org.netbeans.modules.j2ee.metadata.model.api.support.annotation.AnnotationScanner.findAnnotatedTypes(AnnotationScanner.java:87)
	at org.netbeans.modules.j2ee.dd.impl.ejb.annotation.EnterpriseBeansImpl.getSession(EnterpriseBeansImpl.java:59)
	at org.netbeans.modules.j2ee.dd.impl.ejb.annotation.EnterpriseBeansImpl.getEjbs(EnterpriseBeansImpl.java:49)
	at org.netbeans.modules.j2ee.dd.impl.ejb.annotation.EjbJarMetadataImpl.findByEjbClass(EjbJarMetadataImpl.java:50)	at
org.netbeans.modules.j2ee.ejbverification.EJBProblemFinder$1.run(EJBProblemFinder.java:90)
	at org.netbeans.modules.j2ee.ejbverification.EJBProblemFinder$1.run(EJBProblemFinder.java:79)
	at org.netbeans.modules.j2ee.dd.impl.ejb.annotation.EjbJarMetadataModelImpl$1.call(EjbJarMetadataModelImpl.java:70)
	at
org.netbeans.modules.j2ee.metadata.model.api.support.annotation.AnnotationModelHelper.runCallable(AnnotationModelHelper.java:225)
	at
org.netbeans.modules.j2ee.metadata.model.api.support.annotation.AnnotationModelHelper.access$100(AnnotationModelHelper.java:60)
	at
org.netbeans.modules.j2ee.metadata.model.api.support.annotation.AnnotationModelHelper$2.run(AnnotationModelHelper.java:161)
	at
org.netbeans.modules.j2ee.metadata.model.api.support.annotation.AnnotationModelHelper$2.run(AnnotationModelHelper.java:163)
	at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:564)
	at
org.netbeans.modules.j2ee.metadata.model.api.support.annotation.AnnotationModelHelper.runJavaSourceTask(AnnotationModelHelper.java:159)
	at
org.netbeans.modules.j2ee.metadata.model.api.support.annotation.AnnotationModelHelper.runJavaSourceTask(AnnotationModelHelper.java:128)
	at org.netbeans.modules.j2ee.dd.impl.ejb.annotation.EjbJarMetadataModelImpl.runReadAction(EjbJarMetadataModelImpl.java:68)
	at org.netbeans.modules.j2ee.metadata.model.api.MetadataModel.runReadAction(MetadataModel.java:97)
	at org.netbeans.modules.j2ee.ejbverification.EJBProblemFinder.run(EJBProblemFinder.java:78)
	at org.netbeans.modules.j2ee.ejbverification.EJBProblemFinder$ProblemFinderCompInfo.run(EJBProblemFinder.java:149)
[catch] at org.netbeans.api.java.source.JavaSource$CompilationJob.run(JavaSource.java:1484)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
	at java.lang.Thread.run(Thread.java:619)

got the first many times, followed by this one:
SEVERE [global]
java.lang.AssertionError
	at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker.parseFiles(RepositoryUpdater.java:1323)
	at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker.recompile(RepositoryUpdater.java:1780)	at
org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker.access$2500(RepositoryUpdater.java:866)
	at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker$1.run(RepositoryUpdater.java:1110)
	at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker$1.run(RepositoryUpdater.java:896)
	at org.netbeans.modules.java.source.usages.ClassIndexManager.writeLock(ClassIndexManager.java:78)
	at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker.run(RepositoryUpdater.java:893)
	at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker.run(RepositoryUpdater.java:866)
[catch] at org.netbeans.api.java.source.JavaSource$CompilationJob.run(JavaSource.java:1397)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
	at java.lang.Thread.run(Thread.java:619)