title: Null Pointer Exception at OutputPropertiesFactory.java when using docx4j
body: <p>I am using docx4j to extract an uploaded docx file, but getting the following exception</p>
  
  <pre>
  java.lang.NullPointerException
          at org.apache.xml.serializer.OutputPropertiesFactory.getDefaultMethodProperties(OutputPropertiesFactory.java:260)
          at org.apache.xalan.templates.OutputProperties.(OutputProperties.java:83)
          at org.apache.xalan.transformer.TransformerIdentityImpl.(TransformerIdentityImpl.java:88)
          at org.apache.xalan.processor.TransformerFactoryImpl.newTransformerHandler(TransformerFactoryImpl.java:755)
          at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.createTransformerHandler(JAXBContextImpl.java:705)
          at com.sun.xml.internal.bind.v2.runtime.unmarshaller.DomLoader$State.(DomLoader.java:52)
          at com.sun.xml.internal.bind.v2.runtime.unmarshaller.DomLoader.startElement(DomLoader.java:102)
          at com.sun.xml.internal.bind.v2.runtime.unmarshaller.ProxyLoader.startElement(ProxyLoader.java:44)
          at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:470)
          at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:448)
          at com.sun.xml.internal.bind.v2.runtime.unmarshaller.InterningXmlVisitor.startElement(InterningXmlVisitor.java:60)
          at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.startElement(SAXConnector.java:137)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:228)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:265)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:234)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:265)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:234)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:265)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:234)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:265)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:234)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:265)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:234)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:265)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:234)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:265)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:234)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:265)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:234)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:265)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:234)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:265)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:234)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:265)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:234)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:265)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:234)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:265)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:234)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.scan(DOMScanner.java:111)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.scan(DOMScanner.java:94)
          at com.sun.xml.internal.bind.unmarshaller.DOMScanner.scan(DOMScanner.java:87)
          at com.sun.xml.internal.bind.v2.runtime.BinderImpl.associativeUnmarshal(BinderImpl.java:145)
          at com.sun.xml.internal.bind.v2.runtime.BinderImpl.unmarshal(BinderImpl.java:116)
          at org.docx4j.openpackaging.parts.JaxbXmlPartXPathAware.unmarshal(JaxbXmlPartXPathAware.java:171)
          at org.docx4j.openpackaging.io.LoadFromZipNG.getRawPart(LoadFromZipNG.java:560)
          at org.docx4j.openpackaging.io.LoadFromZipNG.getPart(LoadFromZipNG.java:429)
          at org.docx4j.openpackaging.io.LoadFromZipNG.addPartsFromRelationships(LoadFromZipNG.java:352)
          at org.docx4j.openpackaging.io.LoadFromZipNG.process(LoadFromZipNG.java:245)
          at org.docx4j.openpackaging.io.LoadFromZipNG.get(LoadFromZipNG.java:193)
          at org.docx4j.openpackaging.packages.OpcPackage.load(OpcPackage.java:301)
      at org.docx4j.openpackaging.packages.OpcPackage.load(OpcPackage.java:245)
          at org.docx4j.openpackaging.packages.OpcPackage.load(OpcPackage.java:213)
          at org.docx4j.openpackaging.packages.WordprocessingMLPackage.load(WordprocessingMLPackage.java:184)
          at com.myapp.plugin.multipartfileparser.MsWordMultipartFileParser.getDocxHtml(MsWordMultipartFileParser.java:111)
          at com.myapp.plugin.multipartfileparser.MsWordMultipartFileParser.write(MsWordMultipartFileParser.java:68)
          at com.myapp.plugin.service.FileUploaderService.save(FileUploaderService.java:89)
          at com.myapp.plugin.controller.UploadFileController.upload(UploadFileController.java:48)
          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:616)
          at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:212)
          at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)
          at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
          at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
          at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
          at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
          at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900)
          at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827)
          at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
          at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
          at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
          at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:311)
          at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:116)
          at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
          at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
          at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
          at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
          at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:101)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
          at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
          at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
          at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:146)
          at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
          at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
          at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
          at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
          at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
          at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
          at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
          at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:182)
          at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
          at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:182)
          at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
          at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
          at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
          at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
          at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
          at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:173)
          at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
          at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
          at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
          at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
          at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
          at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
          at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
          at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
          at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
          at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
          at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
          at java.lang.Thread.run(Thread.java:679)
  
  
  
  </pre>
  
  <p>Actually, I am able to upload that file at the first time, but at the second time, this exception happened. Just wondering if anyone had seen it before?</p>
  
  <p>Thanks, </p>