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java.lang.NullPointerException: 	at java.util.Collections$UnmodifiableCollection.(Unknown Source)	at java.util.Collections$UnmodifiableSet.(Unknown Source)	at java.util.Collections.unmodifiableSet(Unknown Source)	at org.springframework.ide.eclipse.beans.core.internal.model.AbstractBeansConfig.getImports(Unknown Source)	at org.springframework.ide.eclipse.beans.core.internal.model.BeansProject.checkForImportedBeansConfig(Unknown Source)	at org.springframework.ide.eclipse.beans.core.internal.model.BeansProject.getConfigs(Unknown Source)	at org.springframework.ide.eclipse.beans.core.internal.model.BeansProject.getConfig(Unknown Source)	at org.springframework.ide.eclipse.beans.core.internal.model.BeansModel.getConfig(Unknown Source)	at org.springframework.ide.eclipse.beans.core.BeansCoreUtils.isBeansConfig(Unknown Source)	at org.springframework.ide.eclipse.beans.core.internal.model.BeansModelPropertyTester.test(Unknown Source)	at org.eclipse.core.internal.expressions.Property.test(Unknown Source)	at org.eclipse.core.internal.expressions.TestExpression.evaluate(Unknown Source)	at org.eclipse.core.internal.expressions.CompositeExpression.evaluateAnd(Unknown Source)	at org.eclipse.core.internal.expressions.AndExpression.evaluate(Unknown Source)	at org.eclipse.core.internal.expressions.CompositeExpression.evaluateOr(Unknown Source)	at org.eclipse.core.internal.expressions.OrExpression.evaluate(Unknown Source)	at org.eclipse.ui.internal.navigator.CustomAndExpression.evaluate(Unknown Source)