Hello Mark!
Thank you very much! This helps! I think there is nothing we do with 
request/response objects after their lifetime but we will double check it! If 
we find a way to reproduce it and it looks like a tomcat bug I will open a bug 
ticket.
Best regards
Florian

> On 15/10/2016 22:40, f...@arcor.de wrote:
> > Hello!
> > Some days ago we stumpled about a problem which looks at least very
> similar to this one:
> > https://bz.apache.org/bugzilla//show_bug.cgi?id=58646
> > 
> > With tomcat 8.5.5 we saw a lot of these Exceptions after some time with
> real users on the platform:
> > 
> > org.apache.catalina.connector.CoyoteAdapter.checkRecycled Encountered a
> non-recycled response and recycled it forcedly.
> > org.apache.catalina.connector.CoyoteAdapter$RecycleRequiredException
> > 
> > We couldn't find a way to reproduce the error, but with downgrade to
> tomcat 8.0.38 they never happened again. 
> > 
> > I wonder if this bug was fixed for tomcat 8.5.x as well or only for 7.0.x
> and 8.0.x?
> 
> It was fixed for 9.0.x (trunk) and 8.5.x.
> 
> > I guess the fixed method from tomcat 8.0.32 to 8.0.33 was:
> >
> org.apache.coyote.http11.Http11NioProcessor.breakKeepAliveLoop(SocketWrapper
> Base<NioChannel> socketWrapper)
> 
> Nope.
> 
> The bug was in NioEndpoint$Poller.processSendfile()
> 
> > which is now in 8.5.5:
> >
> org.apache.coyote.http11.Http11NioProcessor.breakKeepAliveLoop(SocketWrapper
> <?> socketWrapper) 
> > 
> > The content of the method from 8.0.32 and 8.5.5 is the same. So I would
> assume this bug is still open in 8.5.5.
> 
> That assumption is incorrect.
> 
> This was the 8.0.x fix:
> http://svn.apache.org/viewvc?view=revision&revision=1731093
> 
> The refactoring in trunk (later copied into 8.5.x) fixed this error a
> month or so before that.
> 
> It is possible that what you are seeing is a Tomcat bug. It is more
> likely that the changes in 8.5.x have exposed a timing sensitive bug in
> your application or a library it uses. The typical cause is a component
> retaining a reference to the request or response object beyond the
> lifetime of a single request. Tomcat reuses these objects internally and
> retained references will cause these sorts of errors. You can try
> setting the system property
> org.apache.catalina.connector.RECYCLE_FACADES to true.
> 
> Mark
> 
> 
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