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java.lang.NullPointerException: 	at org.apache.xerces.util.SymbolHash.put(SymbolHash.java:123)	at org.apache.xerces.impl.xs.SchemaGrammar.addGlobalTypeDecl(SchemaGrammar.java:303)	at org.apache.xerces.impl.xs.traversers.XSDSimpleTypeTraverser.traverseGlobal(XSDSimpleTypeTraverser.java:156)	at org.apache.xerces.impl.xs.traversers.XSDHandler.getGlobalDecl(XSDHandler.java:1173)	at org.apache.xerces.impl.xs.traversers.XSDAttributeTraverser.traverseNamedAttr(XSDAttributeTraverser.java:322)	at org.apache.xerces.impl.xs.traversers.XSDAttributeTraverser.traverseLocal(XSDAttributeTraverser.java:142)	at org.apache.xerces.impl.xs.traversers.XSDAbstractTraverser.traverseAttrsAndAttrGrps(XSDAbstractTraverser.java:412)	at org.apache.xerces.impl.xs.traversers.XSDAttributeGroupTraverser.traverseGlobal(XSDAttributeGroupTraverser.java:168)	at org.apache.xerces.impl.xs.traversers.XSDHandler.traverseSchemas(XSDHandler.java:931)	at org.apache.xerces.impl.xs.traversers.XSDHandler.parseSchema(XSDHandler.java:394)	at org.apache.xerces.impl.xs.XMLSchemaLoader.loadSchema(XMLSchemaLoader.java:491)	at org.apache.xerces.impl.xs.XMLSchemaValidator.findSchemaGrammar(XMLSchemaValidator.java:2292)	at org.apache.xerces.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:1797)	at org.apache.xerces.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:566)	at org.apache.xerces.impl.XMLNamespaceBinder.handleStartElement(XMLNamespaceBinder.java:876)	at org.apache.xerces.impl.XMLNamespaceBinder.startElement(XMLNamespaceBinder.java:568)	at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(XMLDTDValidator.java:756)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:752)	at org.apache.xerces.impl.XMLDocumentScannerImpl$ContentDispatcher.scanRootElementHook(XMLDocumentScannerImpl.java:942)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1520)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:333)	at org.apache.xerces.parsers.DTDConfiguration.parse(DTDConfiguration.java:524)	at org.apache.xerces.parsers.DTDConfiguration.parse(DTDConfiguration.java:580)	at org.apache.xerces.parsers.XMLParser.parse(XMLParser.java:152)	at org.apache.xerces.parsers.DOMParser.parse(DOMParser.java:253)	at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:201)	at org.springframework.beans.factory.xml.DefaultDocumentLoader.loadDocument(DefaultDocumentLoader.java:75)	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:381)	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:327)	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:295)	at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143)	at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178)	at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:149)	at org.springframework.osgi.context.support.OsgiBundleXmlApplicationContext.loadBeanDefinitions(OsgiBundleXmlApplicationContext.java:173)	at org.springframework.osgi.context.support.OsgiBundleXmlApplicationContext.loadBeanDefinitions(OsgiBundleXmlApplicationContext.java:129)	at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:97)	at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:411)	at org.springframework.osgi.context.support.AbstractDelegatedExecutionApplicationContext.startRefresh(AbstractDelegatedExecutionApplicationContext.java:190)	at org.springframework.osgi.extender.internal.dependencies.startup.DependencyWaiterApplicationContextExecutor.stageOne(DependencyWaiterApplicationContextExecutor.java:212)	at org.springframework.osgi.extender.internal.dependencies.startup.DependencyWaiterApplicationContextExecutor.refresh(DependencyWaiterApplicationContextExecutor.java:163)	at org.springframework.osgi.context.support.AbstractDelegatedExecutionApplicationContext.refresh(AbstractDelegatedExecutionApplicationContext.java:124)	at org.springframework.osgi.extender.internal.ContextLoaderListener$2.run(ContextLoaderListener.java:630)	at java.lang.Thread.run(Thread.java:619)