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Posted to users@tomcat.apache.org by Leonard Gestrin <Le...@markettools.com> on 2009/07/26 00:08:51 UTC
JSPwriterImpl generates IO exception while processing
that gets forwarded.
Hello,
This is my second attempt to get anyone's opinion if what's happening is a defect or it can be prevented somehow. I hope it generates more replies.
In my webapp application I have servlet filter that handles error handling for runtime exceptions; when such exception happens, it forwards request to error page where user-frienldy error is presented.
It works fine for most of the cases, however, if runtime exception happens during processing of <jsp:include/> directive, I am getting various exceptions in the log (depending on the location of <jsp:include/> with respect to other tags.)
These exceptions do not appear to cause any harm, however I was curious why are they happening in the first place. Is it illegal to forward request while processing "include"? This is 6.x version of tomcat.
Exception might look like this:
java.io.IOException: Stream closed org.apache.jasper.runtime.JspWriterImpl.ensureOpen(JspWriterImpl.java:204)
Or like this:
Caused by: java.io.IOException: Stream closed
at org.apache.jasper.runtime.JspWriterImpl.ensureOpen(JspWriterImpl.java:204)
at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:115)
at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:188)
... 45 more
Caused by: java.io.IOException: Stream closed
at org.apache.jasper.runtime.BodyContentImpl.ensureOpen(BodyContentImpl.java:582)
at org.apache.jasper.runtime.BodyContentImpl.write(BodyContentImpl.java:142)
at org.apache.jasper.runtime.BodyContentImpl.write(BodyContentImpl.java:159)
at org.apache.jsp.WEB_002dINF.jsp.projects_002dtab_002dcontainer_jsp._jspx_meth_stripes_005flayout_002dcomponent_005f1(projects_002dtab_002dcontainer_jsp.java:484)
at org.apache.jsp.WEB_002dINF.jsp.projects_002dtab_002dcontainer_jsp._jspx_meth_stripes_005flayout_002drender_005f0(projects_002dtab_002dcontainer_jsp.java:138)
at org.apache
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RE: JSPwriterImpl generates IO exception while processing
that gets forwarded.
Posted by Leonard Gestrin <Le...@markettools.com>.
Hi Martin,
The filter is just a pass through to application code - it only gets to work if there is runtime exception coming back from processing request.
ErrorHandlerFilter is mapped to REQUEST, FORWARD, INCLUDE
It has
Try{
filterChain.doFilter(request, response);
} catch (throwable th){
/// ..process th. (setting some attributes in requests for presentation in errorPage.jsp
request.getRequestDispatcher("errorPage.jsp").forward(
request,
response);
}
Example execution path where the issue happens is the following
Browser-> servletX->forward to result.sp; on result.jsp there is <jsp:include "someServlet"/> and "someServlet" throws runtime.
I hope it makes sense :)
Thanks
-----Original Message-----
From: Martin Gainty [mailto:mgainty@hotmail.com]
Sent: Saturday, July 25, 2009 6:46 PM
To: Tomcat Users List
Subject: RE: JSPwriterImpl generates IO exception while processing <jsp:include> that gets forwarded.
dont understand why you want to forward before jsp:include has been processed?
could you explain a bit about webapp architecture or workflow you wish to implement?
Martin Gainty
______________________________________________
Verzicht und Vertraulichkeitanmerkung/Note de déni et de confidentialité
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> From: Leonard.Gestrin@markettools.com
> To: users@tomcat.apache.org
> Date: Sat, 25 Jul 2009 15:08:51 -0700
> Subject: JSPwriterImpl generates IO exception while processing <jsp:include> that gets forwarded.
>
> Hello,
> This is my second attempt to get anyone's opinion if what's happening is a defect or it can be prevented somehow. I hope it generates more replies.
>
> In my webapp application I have servlet filter that handles error handling for runtime exceptions; when such exception happens, it forwards request to error page where user-frienldy error is presented.
> It works fine for most of the cases, however, if runtime exception happens during processing of <jsp:include/> directive, I am getting various exceptions in the log (depending on the location of <jsp:include/> with respect to other tags.)
> These exceptions do not appear to cause any harm, however I was curious why are they happening in the first place. Is it illegal to forward request while processing "include"? This is 6.x version of tomcat.
>
> Exception might look like this:
>
> java.io.IOException: Stream closed org.apache.jasper.runtime.JspWriterImpl.ensureOpen(JspWriterImpl.java:204)
>
> Or like this:
>
> Caused by: java.io.IOException: Stream closed
> at org.apache.jasper.runtime.JspWriterImpl.ensureOpen(JspWriterImpl.java:204)
> at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:115)
> at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:188)
> ... 45 more
>
> Caused by: java.io.IOException: Stream closed
> at org.apache.jasper.runtime.BodyContentImpl.ensureOpen(BodyContentImpl.java:582)
> at org.apache.jasper.runtime.BodyContentImpl.write(BodyContentImpl.java:142)
> at org.apache.jasper.runtime.BodyContentImpl.write(BodyContentImpl.java:159)
> at org.apache.jsp.WEB_002dINF.jsp.projects_002dtab_002dcontainer_jsp._jspx_meth_stripes_005flayout_002dcomponent_005f1(projects_002dtab_002dcontainer_jsp.java:484)
> at org.apache.jsp.WEB_002dINF.jsp.projects_002dtab_002dcontainer_jsp._jspx_meth_stripes_005flayout_002drender_005f0(projects_002dtab_002dcontainer_jsp.java:138)
> at org.apache
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
_________________________________________________________________
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RE: JSPwriterImpl generates IO exception while processing
that gets forwarded.
Posted by Martin Gainty <mg...@hotmail.com>.
dont understand why you want to forward before jsp:include has been processed?
could you explain a bit about webapp architecture or workflow you wish to implement?
Martin Gainty
______________________________________________
Verzicht und Vertraulichkeitanmerkung/Note de déni et de confidentialité
Diese Nachricht ist vertraulich. Sollten Sie nicht der vorgesehene Empfaenger sein, so bitten wir hoeflich um eine Mitteilung. Jede unbefugte Weiterleitung oder Fertigung einer Kopie ist unzulaessig. Diese Nachricht dient lediglich dem Austausch von Informationen und entfaltet keine rechtliche Bindungswirkung. Aufgrund der leichten Manipulierbarkeit von E-Mails koennen wir keine Haftung fuer den Inhalt uebernehmen.
Ce message est confidentiel et peut être privilégié. Si vous n'êtes pas le destinataire prévu, nous te demandons avec bonté que pour satisfaire informez l'expéditeur. N'importe quelle diffusion non autorisée ou la copie de ceci est interdite. Ce message sert à l'information seulement et n'aura pas n'importe quel effet légalement obligatoire. Étant donné que les email peuvent facilement être sujets à la manipulation, nous ne pouvons accepter aucune responsabilité pour le contenu fourni.
> From: Leonard.Gestrin@markettools.com
> To: users@tomcat.apache.org
> Date: Sat, 25 Jul 2009 15:08:51 -0700
> Subject: JSPwriterImpl generates IO exception while processing <jsp:include> that gets forwarded.
>
> Hello,
> This is my second attempt to get anyone's opinion if what's happening is a defect or it can be prevented somehow. I hope it generates more replies.
>
> In my webapp application I have servlet filter that handles error handling for runtime exceptions; when such exception happens, it forwards request to error page where user-frienldy error is presented.
> It works fine for most of the cases, however, if runtime exception happens during processing of <jsp:include/> directive, I am getting various exceptions in the log (depending on the location of <jsp:include/> with respect to other tags.)
> These exceptions do not appear to cause any harm, however I was curious why are they happening in the first place. Is it illegal to forward request while processing "include"? This is 6.x version of tomcat.
>
> Exception might look like this:
>
> java.io.IOException: Stream closed org.apache.jasper.runtime.JspWriterImpl.ensureOpen(JspWriterImpl.java:204)
>
> Or like this:
>
> Caused by: java.io.IOException: Stream closed
> at org.apache.jasper.runtime.JspWriterImpl.ensureOpen(JspWriterImpl.java:204)
> at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:115)
> at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:188)
> ... 45 more
>
> Caused by: java.io.IOException: Stream closed
> at org.apache.jasper.runtime.BodyContentImpl.ensureOpen(BodyContentImpl.java:582)
> at org.apache.jasper.runtime.BodyContentImpl.write(BodyContentImpl.java:142)
> at org.apache.jasper.runtime.BodyContentImpl.write(BodyContentImpl.java:159)
> at org.apache.jsp.WEB_002dINF.jsp.projects_002dtab_002dcontainer_jsp._jspx_meth_stripes_005flayout_002dcomponent_005f1(projects_002dtab_002dcontainer_jsp.java:484)
> at org.apache.jsp.WEB_002dINF.jsp.projects_002dtab_002dcontainer_jsp._jspx_meth_stripes_005flayout_002drender_005f0(projects_002dtab_002dcontainer_jsp.java:138)
> at org.apache
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
_________________________________________________________________
Bing™ brings you maps, menus, and reviews organized in one place. Try it now.
http://www.bing.com/search?q=restaurants&form=MLOGEN&publ=WLHMTAG&crea=TXT_MLOGEN_Local_Local_Restaurants_1x1
RE: JSPwriterImpl generates IO exception while processing
that gets forwarded.
Posted by Leonard Gestrin <Le...@markettools.com>.
I have servlet filter that is invoked ahead of any application code that catches all unhandled exceptions, and then it forwards request to appropriate page depending on the exception.
I am indeed doing requestDispatcher.forward() and I set attributes on the request that are later used in custom error jsp for presentation.
It seems to work fine for all the cases so far except with <jsp:include "someservlet/> where someservlet generates runtime exception. (the browser does get the right error page, but exceptions are logged from tomcat).
I will experiment with using response.sendError() although it's not clear how to pass information back to the page (it appears I can only send a message) , such as stack trace, timestsamp of error, etc. I guess I can cramp it into message and parse it back in the page, but It does not feel right.
I also think that I might be in danger of getting IllegalStateException since it's possible that some info can be already written back to the client. Lets say, I have multiple <jsp:include "servlet1/>, <jsp:include "servlet2/>, and second include generated runtime exception - I suspect this might resolve in IllegalStateException during sendError() although i haven't tested it yet.
Thank you for your responses;
-----Original Message-----
From: Caldarale, Charles R [mailto:Chuck.Caldarale@unisys.com]
Sent: Saturday, July 25, 2009 6:48 PM
To: Tomcat Users List
Subject: RE: JSPwriterImpl generates IO exception while processing <jsp:include>that gets forwarded.
> From: Leonard Gestrin [mailto:Leonard.Gestrin@markettools.com]
> Subject: JSPwriterImpl generates IO exception while processing
> <jsp:include>that gets forwarded.
>
> Is it illegal to forward request while processing "include"?
No, but it's illegal to forward a request after the response has been committed.
Are you actually doing a RequestDispatcher.forward() call, or are you using HttpServletRequest.sendError()? The latter is the proper way to trigger the error page.
- Chuck
THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers.
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RE: JSPwriterImpl generates IO exception while processing
that gets forwarded.
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: Leonard Gestrin [mailto:Leonard.Gestrin@markettools.com]
> Subject: JSPwriterImpl generates IO exception while processing
> <jsp:include>that gets forwarded.
>
> Is it illegal to forward request while processing "include"?
No, but it's illegal to forward a request after the response has been committed.
Are you actually doing a RequestDispatcher.forward() call, or are you using HttpServletRequest.sendError()? The latter is the proper way to trigger the error page.
- Chuck
THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers.
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