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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)