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java.util.ConcurrentModificationException at java.util.AbstractList$SimpleListIterator.next(Unknown Source) at org.eclipse.jst.j2ee.internal.common.classpath.J2EEComponentClasspathContainer.update(J2EEComponentClasspathContainer.java:220) at org.eclipse.jst.j2ee.internal.common.classpath.J2EEComponentClasspathContainer.install(J2EEComponentClasspathContainer.java:413) at org.eclipse.jst.j2ee.internal.common.classpath.J2EEComponentClasspathInitializer.initialize(J2EEComponentClasspathInitializer.java:48) at org.eclipse.jdt.internal.core.JavaModelManager.initializeContainer(JavaModelManager.java:2698) at org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer(JavaModelManager.java:1841) at org.eclipse.jdt.core.JavaCore.getClasspathContainer(JavaCore.java:2705) at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2645) at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2772) at org.eclipse.jdt.internal.core.ClasspathChange.generateDelta(ClasspathChange.java:218) at org.eclipse.jdt.internal.core.DeltaProcessor.resourceChanged(DeltaProcessor.java:1916) at org.eclipse.jdt.internal.core.DeltaProcessingState.resourceChanged(DeltaProcessingState.java:470) at org.eclipse.core.internal.events.NotificationManager$2.run(NotificationManager.java:291) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:285) at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:149) at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:327) at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1181) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1984) at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:793) at org.eclipse.jdt.core.JavaCore.setClasspathContainer(JavaCore.java:4842) at org.eclipse.jst.j2ee.internal.web.classpath.WebAppLibrariesContainer.install(WebAppLibrariesContainer.java:77) at org.eclipse.jst.j2ee.internal.web.classpath.WebAppLibrariesContainer.refresh(WebAppLibrariesContainer.java:88) at org.eclipse.jst.j2ee.internal.common.classpath.J2EEComponentClasspathUpdater$ModuleUpdateJob.processModules(J2EEComponentClasspathUpdater.java:294) at org.eclipse.jst.j2ee.internal.common.classpath.J2EEComponentClasspathUpdater$ModuleUpdateJob.access$4(J2EEComponentClasspathUpdater.java:286) at org.eclipse.jst.j2ee.internal.common.classpath.J2EEComponentClasspathUpdater$ModuleUpdateJob$1.run(J2EEComponentClasspathUpdater.java:327) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.jst.j2ee.internal.common.classpath.J2EEComponentClasspathUpdater$ModuleUpdateJob.run(J2EEComponentClasspathUpdater.java:312) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)