Dave,
is there anyway to set it up so that the session can be created and
not destroyed when i return null?
i am finding out that when i stream back an image (CAPTCHA) this time
(not json/xml/text as before), i need to store the answer in the
session. even if i do session.setAttribute("captcha-answer",answer),
when another action is called, there is nothing in the session i.e.
session.getAttribute("captcha-answer") is null.
the only way i can get a session object properly is if i go to an
action where a JSP page is rendered.
Thanks,
On Sat, Apr 23, 2011 at 12:11 AM, Dave Newton <[email protected]> wrote:
> 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" <[email protected]> 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 <[email protected]>
> 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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