what i did to get rid of this message was to add the following line
before i do anything.
getSerlvetRequest().getSession();
that means anytime this method is called i make the two method calls
above. i'm not sure what the impact on performance will be. but for
now, it gets rid of the message. if anyone has a better suggestion,
please let me know.
On Fri, Apr 22, 2011 at 11:22 PM, Jake Vang <vangj...@googlemail.com> wrote:
> i am using struts 2 with the convention plugin. i have a bunch of
> actions that streams back plain text, json or xml. however, when a
> user goes to a certain URL, i keep seeing an IllegalStateException :
> Cannot create a session after the response has been committed.
>
> why is this happening?
>
> my action class and the method is defined like the following:
>
> public class MyAction extends ActionSupport implements
> ServletRequestAware, ServletResponseAware {
> @Action(value="/myService")
> public String execute() {
> HttpServletResponse response = getServletResponse();
> ServletOutputStream os = response.getOutputStream();
> response.reset();
> response.setContentType("text/plain");
> os.write("some text".getBytes());
> os.close();
> return SUCCESS;
> }
> }
>
> there is a file corresponding to this action in
> /web/WEB-INF/content/myService-success.jsp. this file is blank.
>
> one thing i noticed is that if i go to a URL that does not stream back
> plain text, json, or xml (for example, one that forwards to a JSP
> page), and then go back to /myService, the problem goes away. i
> "think" that when i go to a regular URL (one that forwards to a JSP
> page), the session object is created, and so whenever i go back to
> /myService, the problem goes away.
>
> my webapp will primarily be a backend service, and so there won't be
> any JSP front-ends. but i'd like to use struts2 + convention plugin to
> handle all the data posts. any pointer is appreciated. the full
> stacktrace is below. any help is appreciated.
>
> java.lang.IllegalStateException: Cannot create a session after the
> response has been committed
> at
> org.apache.catalina.connector.Request.doGetSession(Request.java:2381)
> at org.apache.catalina.connector.Request.getSession(Request.java:2098)
> at
> org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:833)
> at
> javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:216)
> at
> org.apache.catalina.core.ApplicationHttpRequest.getSession(ApplicationHttpRequest.java:544)
> at
> org.apache.catalina.core.ApplicationHttpRequest.getSession(ApplicationHttpRequest.java:493)
> at
> javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:224)
> at
> org.apache.jasper.runtime.PageContextImpl._initialize(PageContextImpl.java:146)
> at
> org.apache.jasper.runtime.PageContextImpl.initialize(PageContextImpl.java:124)
> at
> org.apache.jasper.runtime.JspFactoryImpl.internalGetPageContext(JspFactoryImpl.java:107)
> at
> org.apache.jasper.runtime.JspFactoryImpl.getPageContext(JspFactoryImpl.java:63)
> at
> org.apache.jsp.WEB_002dINF.content.locationService_002dsuccess_jsp._jspService(locationService_002dsuccess_js
> p.java:44)
> at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
> at
> org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
> at
> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
> at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
> 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.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
> at
> org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
> at
> org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
> at
> org.apache.struts2.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:156)
> at
> org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:362)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:266)
> at
> com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:16
> 5)
> at
> com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252)
> at
> org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInt
> erceptor.java:68)
> at
> com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
>
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
> at
> com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
> at
> com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:17
> 9)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:
> 130)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)
> at
> com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:165)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:179)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:17
> 6)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
> at
> org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
> at
> org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)
> at
> org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
> at
> org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.
> java:91)
> 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:298)
> at
> org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859)
> at
> org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
> at
> org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555)
> at java.lang.Thread.run(Thread.java:662)
> FATAL
> org.apache.jasper.runtime.JspFactoryImpl.internalGetPageContext(JspFactoryImpl.java:112)
> - Exception initializing
> page context
>
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