> -----Ursprüngliche Nachricht-----
> Von: Thomas Hoffmann (Speed4Trade GmbH)
> <thomas.hoffm...@speed4trade.com.INVALID>
> Gesendet: Donnerstag, 10. März 2022 21:22
> An: Tomcat Users List <users@tomcat.apache.org>
> Betreff: AW: Many IllegalStateException when using http2 protocol
> 
> 
> 
> > -----Ursprüngliche Nachricht-----
> > Von: Konstantin Kolinko <knst.koli...@gmail.com>
> > Gesendet: Donnerstag, 10. März 2022 16:31
> > An: Tomcat Users List <users@tomcat.apache.org>
> > Betreff: Re: Many IllegalStateException when using http2 protocol
> >
> > чт, 10 мар. 2022 г. в 18:16, Thomas Hoffmann (Speed4Trade GmbH)
> > <thomas.hoffm...@speed4trade.com.invalid>:
> > >
> > > > -----Ursprüngliche Nachricht-----
> > > > Von: Konstantin Kolinko <knst.koli...@gmail.com>
> > > > Gesendet: Mittwoch, 9. März 2022 00:52
> > > > An: Tomcat Users List <users@tomcat.apache.org>
> > > > Betreff: Re: Many IllegalStateException when using http2 protocol
> > > >
> > > > пн, 7 мар. 2022 г. в 16:26, Thomas Hoffmann (Speed4Trade GmbH)
> > > > <thomas.hoffm...@speed4trade.com.invalid>:
> > > > >
> > > > > Hello,
> > > > >
> > > > > Since upgrading from Tomcat 9.0.56 to Tomcat 10.0.16, the
> > > > > localhost-logfile
> > > > is filling up with stacks of the form:
> > > > >
> > > > > 07-Mar-2022 07:24:01.780 SCHWERWIEGEND
> > > > > [https-openssl-nio-443-exec-
> > > > 21] org.apache.catalina.core.ApplicationDispatcher.invoke
> > > > Servlet.service() for servlet [jsp] threw exception
> > > > >         java.lang.IllegalStateException: Connection [66], Stream
> > > > > [113], Unable
> > > > to write to stream once it has been closed
> > > > >                 at
> > > >
> >
> org.apache.coyote.http2.Stream$StreamOutputBuffer.doWrite(Stream.java:
> > > > 843)
> > > > >                 at
> > > > org.apache.coyote.http11.filters.GzipOutputFilter$FakeOutputStream
> > > > .w
> > > > rite(
> > > > GzipOutputFilter.java:159)
> > > > >                 at
> > > >
> >
> java.base/java.util.zip.DeflaterOutputStream.deflate(DeflaterOutputStream.
> > > > java:252)
> > > > >                 at
> > > > java.base/java.util.zip.DeflaterOutputStream.write(DeflaterOutputS
> > > > tr
> > > > eam.ja
> > > > va:210)
> > > > >                 at
> > > > java.base/java.util.zip.GZIPOutputStream.write(GZIPOutputStream.ja
> > > > va
> > > > :148
> > > > )
> > > > >                 at
> > > >
> >
> org.apache.coyote.http11.filters.GzipOutputFilter.doWrite(GzipOutputFilter.
> > > > java:69)
> > > > >                 at
> > > >
> > org.apache.coyote.http2.Http2OutputBuffer.doWrite(Http2OutputBuffer.
> > > > jav
> > > > a:59)
> > > > >                 at 
> > > > > org.apache.coyote.Response.doWrite(Response.java:625)
> > > > >                 at
> > > > org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBu
> > > > ff
> > > > er.ja
> > > > va:340)
> > > > >                 at
> > > > org.apache.catalina.connector.OutputBuffer.flushByteBuffer(OutputB
> > > > uf
> > > > fer.j
> > > > ava:783)
> > > > >                 at
> > > > org.apache.catalina.connector.OutputBuffer.realWriteChars(OutputBu
> > > > ff
> > > > er.ja
> > > > va:453)
> > > > >                 at
> > > > org.apache.catalina.connector.OutputBuffer.flushCharBuffer(OutputB
> > > > uf
> > > > fer.j
> > > > ava:788)
> > > > >                 at
> > > >
> org.apache.catalina.connector.OutputBuffer.append(OutputBuffer.java:
> > > > 727)
> > > > >                 at
> > > > org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java
> > > > :5
> > > > 05)
> > > > >                 at
> > > > org.apache.catalina.connector.CoyoteWriter.write(CoyoteWriter.java
> > > > :1
> > > > 48)
> > > > >                 at
> > > >
> >
> org.apache.catalina.filters.ExpiresFilter$XPrintWriter.write(ExpiresFilter.java:
> > > > 850)
> > > > >                 at
> > > > org.apache.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:2
> > > > 75
> > > > )
> > > > >                 at 
> > > > > java.base/java.io.PrintWriter.write(PrintWriter.java:506)
> > > > >                 at
> > > > org.apache.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:2
> > > > 75
> > > > )
> > > > >                 at 
> > > > > java.base/java.io.PrintWriter.write(PrintWriter.java:506)
> > > > >                 at
> > > > org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.
> > > > ja
> > > > va:112
> > > > )
> > > > >                 at
> > > > org.apache.jasper.runtime.JspWriterImpl.flush(JspWriterImpl.java:1
> > > > 60
> > > > )
> > > > >                 at
> > > > org.apache.jsp.WEB_002dINF.jsp.businessrelations.ticket_005frelati
> > > > on
> > > > s_inc_
> > > > jsp._jspService(ticket_005frelations_inc_jsp.java:702)
> > > > >                 ...
> > > > >
> > > > > The jsp-file varies between the stacktraces, so it is not
> > > > > related to a certain
> > > > jsp-File.
> > > > > The stream.java looks like (which didn’t change from Tomcat 9 to 10):
> > > > >         @Override
> > > > >         public final synchronized int doWrite(ByteBuffer chunk)
> > > > > throws
> > > > IOException {
> > > > >             if (closed) {
> > > > >                 throw new IllegalStateException(
> > > > >                         sm.getString("stream.closed",
> > > > > getConnectionId(), getIdAsString()));
> > > >
> > > > I wonder why it throws an ISE here, instead of a proper
> > > > IOException as declared by this method.
> > > > (It looks like a bug, but I have not investigated the history of
> > > > this code yet.)
> > > >
> > > > There is nothing suspicious in the stacktrace. An unusual bit of
> > > > configuration here is having enabled a GzipOutputFilter.
> > > >
> > > > Best regards,
> > > > Konstantin Kolinko
> > >
> > > Good observation about the GZip-Filter!
> > > We are using compression="force" in our connector.
> > > I modified some http2 settings (raised some limits) and set
> > compression="off" ... up to now, the error disappeared.
> > > As I modified several settings, I will carefully revert the changes
> > > step by
> > step to figure out which connector parameter is causing this error.
> > > Maybe the GZip-Filter doesn’t work well with the http2 protocol in
> tomcat.
> > > I will investigate and post the results.
> >
> > Mark has already changed that IllegalStateException to an IOException,
> > and that is included into  10.0.18 that has already been tagged and is
> > currently being voted for an official release.
> >
> > You may take part in the testing. See VOTE thread on the dev mailing
> > list for links.
> >
> > Best regards,
> > Konstantin Kolinko
> 
> Hm... some users reported blank pages from time to time which seem to
> correlate with the error in the logfile. After hitting F5 the page appeared.
> So I am not sure if changing the Exception-Type finally solves the issue.

Hello,
short update on that issue.
I could track down the problem to the combination http2 and compression="force".
In this combination, the errors occur. When using compression="no", the error 
is gone.
With compression="force", users are reporting issues with pages, not fully 
getting loaded. Only half of the page is sometimes shown.
Pressing F5 and the page shows up again.
It seems that http2 and compression causes some issues so that browser or 
server is closing the connection.

I could further test, whether compression="on" has the same issue.
Another option would be to test with tomcat 10.0.18 but as only the exception 
type changed, I have some doubts whether it fixes the root cause.
Setting logging to finest would also be an option. In this case it would be 
helpful to be able to reload the logging.properties during runtime or changing
the loglevel during runtime. Unfortunately I couldn’t get it to work. Changing 
loglevel during runtime doesn’t show any effect, even if I change
the context-classloader before calling 
LogFactory.getLog("org.apache.coyote.http2")

Any thoughts how to track down the issue or how I can provide further 
information to help the tomcat team to find the issue?
The issue didn’t show up in 9.0.56 but after upgrading to 10.0.16

Thanks! Thomas

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