My first guess would be to return null so you're not rendering a jsp after
the output stream is closed.
Dave
On Apr 22, 2011 11:49 PM, "Jake Vang" <vangj...@googlemail.com> wrote:
> 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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