sendRedirect()

We cannot call this method if the response is committed.

In this code, we are forcing the servlet container to send the header & generated text to the browser immediately by calling pw.flush(). The response is said to be committed at this point.

I doubt the correctness of this statement. Does it means that when we call flush() the text will be seen in the browser? I think this is not correct.

I see both the messages together (after waiting for 10 seconds).

I think by calling flush(), we say the response it committed (but not shown in browser immediately) and now we can't call sendRedirect().

Moreover, what's the significant of flush() method ?
[ February 26, 2007: Message edited by: Sandeep Vaid ]

I'm not sure either about the flush() method forcing output. I think that calling flush() on the PrintWriter only commits the response.

ServletResponse's flushBuffer() method is supposed to force the content to be output to the client.

When i tried i got the output as Hello World! . It didn't generate any IllegalStateException.

But in the specification of sendRedirect() it is mentioned as

throws java.lang.IllegalStateException - If the response was committed or if a partial URL is given and cannot be converted into a valid URL

Could you please explain why i am not getting the exception

That's weird indeed. I've tried it myself on Tomcat and didn't get the exception either. I think that we're supposed to get the IllegalStateException though. If anybody using another container could try...

I tried the same coding in websphere i got IllegalStateException .
[ February 27, 2007: Message edited by: Prabu sb ]

Looks like this is a containter problem.

See the following classes from catalina.jar in Tomcat org.apache.catalina.connector.Response and org.apache.catalina.connector.OutputBuffer.

Thanks Prabu, that seems to clear the doubt.
Tomcat is a bit flexible on that one.

The real exam is not dependent on App/Web servers. What should we do if we have the same question in the exam? I mean will we say it will through IllegalStateExcption or not?
Regards,
Sri.

As the spec says, it throws one.

Yes, as per the specs, it should throw and IllegalStateException!

Thanks guys for your replies. It helped me...

Hi..

I tried this code on jakarta-tomcat-5.0.28 . And getting IllegalStateException on my tomcat console.
What I did. I just created a listener to listen to addition of attribute to request.
To see the snapshot, Click Here

ServletH instance is initialized
ServletL instance is created
ServletL instance is initialized
Request org.apache.coyote.tomcat5.CoyoteRequestFacade@8acfc3 initialized at Sun Aug 19 19:44:48 IST 2007
Request org.apache.coyote.tomcat5.CoyoteRequestFacade@8acfc3 destroyed at Sun Aug 19 19:44:48 IST 2007
Request org.apache.coyote.tomcat5.CoyoteRequestFacade@8acfc3 initialized at Sun Aug 19 19:44:55 IST 2007
Attribute javax.servlet.error.exception with value java.lang.IllegalStateException added to request org.apache.coyote.tomcat5.CoyoteRequestFacade@8acfc3 at Sun Aug 19 19:44:55 IST 2007
Request org.apache.coyote.tomcat5.CoyoteRequestFacade@8acfc3 destroyed at Sun Aug 19 19:44:55 IST 2007

In ouput, I saw
Hello World!

Code was

Regards,
Khushhal
[ August 19, 2007: Message edited by: khushhal yadav ]

Hi Guys,

What is the solution for this exception? I am executing the following code with sendRedirect(). The redirects tkaes me to correct page, however, it also throws exception at the control. I tried removing flushBuffer(). I also tried response.encodeRedirectURL(), but no luck. Can somebody please help me on this

?
Here is my code:

ERROR on Console:

[7/8/10 20:12:46:044 IST] 000000d3 ServletWrappe E SRVE0068E: Uncaught exception thrown in one of the service methods of the servlet: Faces Servlet. Exception thrown : java.lang.IllegalStateException: Cannot forward. Response already committed.
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:157)
at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:325)
at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:174)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:220)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1075)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:550)
at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:478)
at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3391)
at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:267)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:811)
at com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1455)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:115)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:458)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:387)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:267)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:195)
at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:743)
at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:873)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1473)

[7/8/10 20:12:46:091 IST] 000000d3 LocalTranCoor E WLTC0017E: Resources rolled back due to setRollbackOnly() being called.
[7/8/10 20:12:46:091 IST] 000000d3 WebApp E [Servlet Error]-[Faces Servlet]: java.lang.IllegalStateException: Cannot forward. Response already committed.
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:157)
at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:325)
at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:174)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:220)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1075)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:550)
at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:478)
at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3391)
at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:267)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:811)
at com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1455)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:115)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:458)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:387)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:267)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:195)
at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:743)
at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:873)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1473)

[7/8/10 20:12:46:091 IST] 000000d3 SRTServletRes W WARNING: Cannot set status. Response already committed.
[7/8/10 20:12:46:091 IST] 000000d3 SRTServletRes W WARNING: Cannot set header. Response already committed.

Hi Amit,

You are replying on a very old thread. Next time start a new one as the discussion in that thread doesn't seem related to your problem.

Please privide us with some extra information:

What is the URL you are using?

What servlets are configured in your web-app?

You are getting an IllegalStateException on your Faces Servlet. Is the code in the beginning from the Faces Servlet?

Regards,
Frits

Hi Frits,

Firstly thank you for replying on this. As per your suggestion, I have started new thread for this issue with below link. I would really appreciate any help with this.
http://www.coderanch.com/t/502121/java-Web-Component-SCWCD/certification/java-lang-IllegalStateException-sendRedirect