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java.lang.NullPointerException: 	at org.springframework.ide.eclipse.beans.ui.editor.BeansEditorUtils.getClassNamesOfBean(BeansEditorUtils.java:264)	at org.springframework.ide.eclipse.beans.ui.editor.contentassist.BeansContentAssistProcessor.computeAttributeValueProposals(BeansContentAssistProcessor.java:782)	at org.springframework.ide.eclipse.beans.ui.editor.contentassist.BeansContentAssistProcessor.addAttributeValueProposals(BeansContentAssistProcessor.java:492)	at org.eclipse.wst.xml.ui.internal.contentassist.AbstractContentAssistProcessor.computeAttributeValueProposals(AbstractContentAssistProcessor.java:1139)	at org.eclipse.wst.xml.ui.internal.contentassist.AbstractContentAssistProcessor.computeCompletionProposals(AbstractContentAssistProcessor.java:1173)	at org.eclipse.wst.xml.ui.internal.contentassist.XMLContentAssistProcessor.computeCompletionProposals(XMLContentAssistProcessor.java:91)	at org.eclipse.wst.xml.ui.internal.contentassist.AbstractContentAssistProcessor.computeCompletionProposals(AbstractContentAssistProcessor.java:1278)	at org.eclipse.wst.xml.ui.internal.contentassist.XMLContentAssistProcessor.computeCompletionProposals(XMLContentAssistProcessor.java:101)	at org.eclipse.wst.sse.ui.internal.contentassist.CompoundContentAssistProcessor.computeCompletionProposals(CompoundContentAssistProcessor.java:232)	at org.eclipse.jface.text.contentassist.ContentAssistant.computeCompletionProposals(ContentAssistant.java:1503)	at org.eclipse.jface.text.contentassist.CompletionProposalPopup.computeProposals(CompletionProposalPopup.java:301)