org.jboss.tools.common.validation.JBTValidationException
	at org.jboss.tools.common.validation.ValidatorManager.validateInJob(ValidatorManager.java:99)
	at org.eclipse.wst.validation.internal.operations.ValidatorJob.run(ValidatorJob.java:78)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: java.util.ConcurrentModificationException
	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
	at java.util.AbstractList$Itr.next(AbstractList.java:343)
	at org.jboss.tools.jst.web.kb.include.IncludeContextBuilder.getIncludeContextDefinition(IncludeContextBuilder.java:135)
	at org.jboss.tools.jst.web.kb.include.IncludeContextBuilder.processIncludeContextElement(IncludeContextBuilder.java:117)
	at org.jboss.tools.jst.web.kb.include.IncludeContextBuilder.readElement(IncludeContextBuilder.java:210)
	at org.eclipse.ui.internal.registry.RegistryReader.readElements(RegistryReader.java:144)
	at org.eclipse.ui.internal.registry.RegistryReader.readExtension(RegistryReader.java:155)
	at org.eclipse.ui.internal.registry.RegistryReader.readRegistry(RegistryReader.java:176)
	at org.jboss.tools.jst.web.kb.include.IncludeContextBuilder.readContributions(IncludeContextBuilder.java:265)
	at org.jboss.tools.jst.web.kb.include.IncludeContextBuilder.initCache(IncludeContextBuilder.java:252)
	at org.jboss.tools.jst.web.kb.include.IncludeContextBuilder.getIncludeContextDefinitions(IncludeContextBuilder.java:274)
	at org.jboss.tools.jst.web.kb.include.IncludeContextBuilder.getContextType(IncludeContextBuilder.java:317)
	at org.jboss.tools.jst.web.kb.PageContextFactory.createPageContextInstance(PageContextFactory.java:457)
	at org.jboss.tools.jst.web.kb.PageContextFactory.createPageContext(PageContextFactory.java:421)
	at org.jboss.tools.jst.web.kb.PageContextFactory.createPageContext(PageContextFactory.java:190)
	at org.jboss.tools.jst.web.kb.PageContextFactory.createPageContext(PageContextFactory.java:179)
	at org.jboss.tools.jst.web.kb.internal.validation.ELValidator.validateFile(ELValidator.java:245)
	at org.jboss.tools.jst.web.kb.internal.validation.ELValidator.validateAll(ELValidator.java:230)
	at org.jboss.tools.common.validation.ValidatorManager.validateAll(ValidatorManager.java:131)
	at org.jboss.tools.common.validation.ValidatorManager.validateInJob(ValidatorManager.java:83)
	... 2 more