Trying again: ClassCastException in PageContextImpl

[Joel Roth-Nater <ro...@quoininc.com>]

I'm re-posting this because I believe there's a bug here and I haven't
got any responses:


On Sun, 16 Jun 2002, Joel Roth-Nater wrote:

> (longish, please read if you're familiar with Jasper sources)
> 
> I'm using Jasper which comes packaged with JBoss 3.0. One of the JSPs
> has the following code:
> 
> BodyContent bc = pageContext.pushBody();
> request.getRequestDispatcher(jspName).forward(request, response);
> pageContext.popBody();
> wc.writeOut(new FileWriter(...));
> 
> I am using this to generate a bunch of files on disk. At the bottom of
> the including page, I get the following error:
> 
> java.lang.ClassCastException: org.apache.jasper.runtime.BodyContentImpl
>         at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:174)
>         at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:198)
>         at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:193)
>         at org.apache.jsp.generate$jsp._jspService(generate$jsp.java:552)
>         at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
> <snip>
> 
> 
> This is the cleanup code at the bottom of the JSP (generate$jsp.java):
> 
>       } catch (Throwable t) {
>         if (out != null && out.getBufferSize() != 0)
>           out.clearBuffer();
>         if (pageContext != null) pageContext.handlePageException(t);
>       } finally {
> 552:    if (_jspxFactory != null) _jspxFactory.releasePageContext(pageContext);
>       }
> 
> 
> ... and this is the Jasper code where it happens (PageContextImpl.java):
> 
>     public void release() {
>         out = baseOut;
>         try {
>             if (isIncluded) {
> 174:            ((JspWriterImpl)out).flushBuffer();
>                         // push it into the including jspWriter
>             } else {
>                 out.flush();
>             }
>         } catch (IOException ex) {
>             loghelper.log("Internal error flushing the buffer in release()");
>         }
> 
> 
> It seems that after the popBody() in the JSP, out is no longer of
> class JspWriterImpl with makes the cast fail. To be sure, my use of
> the BodyContent is somewhat creative, but I'm not aware that I'm
> breaking any J2EE contract. Also, my code works just fine under
> WebLogic. Would it make sense to check instanceof JspWriterImpl on
> line 173?
> 
> Or am I missing something?
> 
> Any hint is appreciated
> 
> -- Joel
> 
> 
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> 


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Re: Trying again: ClassCastException in PageContextImpl

[Remy Maucherat <re...@apache.org>]

Joel Roth-Nater wrote:
> I'm re-posting this because I believe there's a bug here and I haven't
> got any responses:

This code got cleaned up in Jasper 2, so this should work better.
It is unlikely this would get ported to Jasper 1, though.

Remy


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