Caused by: java.lang.NullPointerException
	at org.jboss.tools.common.ui.marker.ConfigureProblemSeverityResolutionGenerator.getPreferenceKey(ConfigureProblemSeverityResolutionGenerator.java:118)
	at org.jboss.tools.common.ui.marker.ConfigureProblemSeverityResolutionGenerator.hasProposals(ConfigureProblemSeverityResolutionGenerator.java:130)
	at org.jboss.tools.common.text.xml.quickfix.QuickFixManager.hasProposals(QuickFixManager.java:54)
	at org.jboss.tools.common.text.xml.quickfix.MarkerAnnotationInfo.getProposals(MarkerAnnotationInfo.java:84)
	at org.jboss.tools.common.text.xml.quickfix.MarkerAnnotationInfo.getCompletionProposals(MarkerAnnotationInfo.java:51)
	at org.jboss.tools.common.text.xml.xpl.MarkerProblemAnnotationHoverProcessor$MarkerAnnotationInformationControl.createContent(MarkerProblemAnnotationHoverProcessor.java:215)
	at org.jboss.tools.common.text.xml.xpl.MarkerProblemAnnotationHoverProcessor$MarkerAnnotationInformationControl.setInput(MarkerProblemAnnotationHoverProcessor.java:184)
	at org.eclipse.jface.text.AbstractInformationControlManager.internalShowInformationControl(AbstractInformationControlManager.java:1181)
	at org.eclipse.jface.text.AbstractInformationControlManager.presentInformation(AbstractInformationControlManager.java:1150)
	at org.eclipse.jface.text.AbstractHoverInformationControlManager.presentInformation(AbstractHoverInformationControlManager.java:902)
	at org.eclipse.jface.text.TextViewerHoverManager.doPresentInformation(TextViewerHoverManager.java:243)
	at org.eclipse.jface.text.TextViewerHoverManager$5.run(TextViewerHoverManager.java:233)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
	... 24 more

And please, add steps to verify the issue.
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