Hi Jake,
maybe this aproach would help You:
http://struts.apache.org/2.2.1.1/docs/stream-result.html
Best greetings,
Paweł Wielgus.
2011/4/24 Jake Vang <vangj...@googlemail.com>:
> 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 <davelnew...@gmail.com> 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" <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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>>
>
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