when I combined spring async mvc with struts2 sitemesh plugin, It will throw NPE
java.lang.NullPointerException
at org.apache.struts2.ServletActionContext.getRequest(ServletActionContext.java:112)
at org.apache.struts2.sitemesh.StrutsSiteMeshFactory.isInsideActionTag(StrutsSiteMeshFactory.java:25)
at org.apache.struts2.sitemesh.StrutsSiteMeshFactory.shouldParsePage(StrutsSiteMeshFactory.java:21)
at com.opensymphony.sitemesh.compatability.PageParser2ContentProcessor.handles(PageParser2ContentProcessor.java:45)
at com.opensymphony.sitemesh.webapp.ContentBufferingResponse$1.shouldParsePage(ContentBufferingResponse.java:29)
at com.opensymphony.module.sitemesh.filter.PageResponseWrapper.setContentType(PageResponseWrapper.java:63)
at com.opensymphony.sitemesh.webapp.ContentBufferingResponse$2.setContentType(ContentBufferingResponse.java:39)
at com.opensymphony.module.sitemesh.filter.PageResponseWrapper.addHeader(PageResponseWrapper.java:135)
at javax.servlet.http.HttpServletResponseWrapper.addHeader(HttpServletResponseWrapper.java:173)
at org.springframework.http.server.ServletServerHttpResponse.writeHeaders(ServletServerHttpResponse.java:103)
at org.springframework.http.server.ServletServerHttpResponse.getBody(ServletServerHttpResponse.java:83)
at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:217)
at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:208)
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:161)
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:101)
at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:199)
at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:71)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:128)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:781)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:721)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748)
at org.apache.catalina.core.ApplicationDispatcher.doDispatch(ApplicationDispatcher.java:659)
at org.apache.catalina.core.ApplicationDispatcher.dispatch(ApplicationDispatcher.java:625)
at org.apache.catalina.core.AsyncContextImpl$1.run(AsyncContextImpl.java:239)
at org.apache.catalina.core.AsyncContextImpl.doInternalDispatch(AsyncContextImpl.java:382)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:215)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.asyncDispatch(CoyoteAdapter.java:299)
at org.apache.coyote.http11.AbstractHttp11Processor.asyncDispatch(AbstractHttp11Processor.java:1652)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
The CDI plugin was using a single 'CreationalContext' for all beans created by the CDIObjectFactory. This is incorrect and the size of the 'dependentInstances' (in the WELD implementation) grows indefinately with no beans being removed.
Fix is to use a new 'CreationalContext' for every bean created. In our tests with WELD this does not effect the applications performance. Idealy a single 'CreationalContext' should be created for the request lifecycle. However the struts ObjectFactory API does not appear to provide any information able the lifecycle.
This can be done only in a component as when dynamic attributes are set
by a container on the tag, the component wasn't instantiated yet - it
will be created in doStartTag method which is called after all
attributes were set
Przemek Bruski