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java.lang.NullPointerException: 	at org.springframework.ide.eclipse.core.model.validation.AbstractValidationContext.get(AbstractValidationContext.java:74)	at org.springframework.ide.eclipse.beans.core.model.validation.AbstractNonInfrastructureBeanValidationRule.getTypeHierarchyEngine(AbstractNonInfrastructureBeanValidationRule.java:89)	at org.springframework.ide.eclipse.beans.core.internal.model.validation.rules.BeanPropertyRule.validate(BeanPropertyRule.java:60)	at org.springframework.ide.eclipse.quickfix.validator.PropertyValidator.validateAttributeWithConfig(PropertyValidator.java:69)	at org.springframework.ide.eclipse.quickfix.validator.BeanValidator.validateAttributeWithConfig(BeanValidator.java:158)	at org.springframework.ide.eclipse.quickfix.QuickfixUtils.validateAttribute(QuickfixUtils.java:526)	at org.springframework.ide.eclipse.quickfix.validator.BeanValidatorVisitor.visitAttributes(BeanValidatorVisitor.java:63)	at org.springframework.ide.eclipse.quickfix.validator.BeanValidatorVisitor.visitNode(BeanValidatorVisitor.java:85)	at org.springframework.ide.eclipse.quickfix.validator.BeanValidatorVisitor.visitChildren(BeanValidatorVisitor.java:77)	at org.springframework.ide.eclipse.quickfix.validator.BeanValidatorVisitor.visitNode(BeanValidatorVisitor.java:90)	at org.springframework.ide.eclipse.quickfix.BeansEditorValidator.validateNode(BeansEditorValidator.java:485)	at org.springframework.ide.eclipse.quickfix.BeansEditorValidator.validate(BeansEditorValidator.java:465)	at org.eclipse.wst.sse.ui.internal.reconcile.validator.ReconcileStepForValidator.validate(ReconcileStepForValidator.java:381)	at org.eclipse.wst.sse.ui.internal.reconcile.validator.ReconcileStepForValidator.reconcileModel(ReconcileStepForValidator.java:259)	at org.eclipse.jface.text.reconciler.AbstractReconcileStep.reconcile(AbstractReconcileStep.java:95)	at org.eclipse.wst.sse.ui.internal.reconcile.validator.ValidatorStrategy.reconcile(ValidatorStrategy.java:269)	at org.eclipse.wst.sse.ui.internal.reconcile.DocumentRegionProcessor.process(DocumentRegionProcessor.java:321)	at org.eclipse.wst.sse.ui.internal.reconcile.StructuredRegionProcessor.process(StructuredRegionProcessor.java:258)	at org.eclipse.wst.sse.ui.internal.reconcile.DirtyRegionProcessor$BackgroundThread.run(DirtyRegionProcessor.java:691)