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Type: Bug
Resolution: Done
Priority: Critical
Fix Version/s: 4.1.1.Alpha1, 4.2.0.Alpha1
Affects Version/s: 4.1.0.Final
Component/s: common
Labels:
None

Git Pull Request:
https://github.com/jbosstools/jbosstools-jst/pull/193, https://github.com/jbosstools/jbosstools-jst/pull/194

The following exception happens sporadically when Eclipse is building projects in background (each panel is a log entry in the Error log panel):

Errors running builder 'JBoss Knowledge Base Builder' on project 'ui-tests'.
java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)
	at java.util.HashMap$KeyIterator.next(HashMap.java:928)
	at java.util.AbstractCollection.addAll(AbstractCollection.java:333)
	at org.jboss.tools.jst.web.kb.internal.scanner.ClassPathMonitor.hasToUpdateProjectDependencies(ClassPathMonitor.java:173)
	at org.jboss.tools.jst.web.kb.internal.scanner.ClassPathMonitor.build(ClassPathMonitor.java:214)
	at org.jboss.tools.jst.web.kb.internal.KbBuilder.build(KbBuilder.java:102)
	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:726)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239)
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351)
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374)
	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)
	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)

and:

Errors running builder 'JBoss Knowledge Base Builder' on project 'maven'.
java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)
	at java.util.HashMap$KeyIterator.next(HashMap.java:928)
	at java.util.AbstractCollection.addAll(AbstractCollection.java:333)
	at org.jboss.tools.jst.web.kb.internal.scanner.ClassPathMonitor.hasToUpdateProjectDependencies(ClassPathMonitor.java:173)
	at org.jboss.tools.jst.web.kb.internal.scanner.ClassPathMonitor.build(ClassPathMonitor.java:214)
	at org.jboss.tools.jst.web.kb.internal.KbBuilder.build(KbBuilder.java:102)
	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:726)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239)
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351)
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374)
	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)
	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)

Problems occurred when invoking code from plug-in: "org.eclipse.core.resources".
java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)
	at java.util.HashMap$KeyIterator.next(HashMap.java:928)
	at java.util.AbstractCollection.addAll(AbstractCollection.java:333)
	at org.jboss.tools.jst.web.kb.internal.scanner.ClassPathMonitor.hasToUpdateProjectDependencies(ClassPathMonitor.java:173)
	at org.jboss.tools.jst.web.kb.internal.scanner.ClassPathMonitor.build(ClassPathMonitor.java:214)
	at org.jboss.tools.jst.web.kb.internal.KbBuilder.build(KbBuilder.java:102)
	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:726)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239)
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351)
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374)
	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)
	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)

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