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Date: Tue, 4 Oct 2011 04:29:53 +0400
Message-ID: 
 <CABzHfV=QOFtQexckkcAcktaeZrG5J6-M4_tOwDvuBYMCVmx2Jw@mail.gmail.com>
Subject: Re: IllegalStateException using CompressionFilter with Tomcat
 7.0.21/22
From: Konstantin Kolinko <knst.kolinko@gmail.com>
To: Tomcat Users List <users@tomcat.apache.org>
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2011/10/4 Kari Scott <Kari.Scott@cdw.com>:
> SEVERE: Servlet.service() for servlet [jsp] in context with path [] threw=
 exception [java.lang.IllegalStateException: getWriter() has already been c=
alled for this response] with root cause
> java.lang.IllegalStateException: getWriter() has already been called for =
this response
> =A0 =A0 =A0 =A0at org.apache.catalina.connector.Response.getOutputStream(=
Response.java:594)
> =A0 =A0 =A0 =A0at org.apache.catalina.connector.ResponseFacade.getOutputS=
tream(ResponseFacade.java:199)
> =A0 =A0 =A0 =A0at com.tirerack.filters.CompressionResponseStream.<init>(C=
ompressionResponseStream.java:47)
> =A0 =A0 =A0 =A0at com.tirerack.filters.CompressionServletResponseWrapper.=
createOutputStream(CompressionServletResponseWrapper.java:172)
> =A0 =A0 =A0 =A0at com.tirerack.filters.CompressionServletResponseWrapper.=
getWriter(CompressionServletResponseWrapper.java:250)
> =A0 =A0 =A0 =A0at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWrit=
erImpl.java:125)
> =A0 =A0 =A0 =A0at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(Jsp=
WriterImpl.java:118)
> =A0 =A0 =A0 =A0at org.apache.jasper.runtime.PageContextImpl.release(PageC=
ontextImpl.java:190)
> =A0 =A0 =A0 =A0at org.apache.jasper.runtime.JspFactoryImpl.internalReleas=
ePageContext(JspFactoryImpl.java:123)
> =A0 =A0 =A0 =A0at org.apache.jasper.runtime.JspFactoryImpl.releasePageCon=
text(JspFactoryImpl.java:80)
> =A0 =A0 =A0 =A0at org.apache.jsp.upgrade_005fgarage.SetCurrentVehicle_jsp=
._jspService(SetCurrentVehicle_jsp.java:278)
>
>

The above stack trace is quite odd.
JspWriterImpl calls getWriter(), but CompressionServletResponseWrapper
implements it as a call to createOutputStream(), but that fails
because, well, you have already called getWriter().


It feels like there is some bug there, but I would like a more simple examp=
le.

I think it is OK to open an issue in Bugzilla, but please attach an
example (with source code) that reproduces this. I think a lot depends
on the state of JspWriterImpl when PageContextImpl.release() is
called.  I think it should be empty at that point, but it is not.

Best regards,
Konstantin Kolinko

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