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Posted to users@tomcat.apache.org by Torsten Krah <kr...@gmail.com> on 2026/03/24 13:42:36 UTC
Tomcat 11.0.18 - java.lang.AssertionError in Mapper#internalMap
Hi,
eventually while reading logs from my container I stumbled over this
one:
Exception in thread "https-jsse-nio-8443-exec-18" java.lang.AssertionError
at org.apache.catalina.mapper.Mapper.internalMap(Mapper.java:713)
at org.apache.catalina.mapper.Mapper.map(Mapper.java:675)
at org.apache.catalina.connector.CoyoteAdapter.postParseRequest(CoyoteAdapter.java:692)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:336)
at org.apache.coyote.http2.StreamProcessor.service(StreamProcessor.java:459)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
at org.apache.coyote.http2.StreamProcessor.process(StreamProcessor.java:102)
at org.apache.coyote.http2.StreamRunnable.run(StreamRunnable.java:35)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:946)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:480)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:57)
at java.base/java.lang.Thread.run(Unknown Source)
Anyone an idea how this would happen, what might have gone wrong?
It did just happen only once, I have no reproducer and no idea which
request might have triggered this, but I am curious about that trace.
kind regards
Torsten
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Re: Tomcat 11.0.18 - java.lang.AssertionError in Mapper#internalMap
Posted by Torsten Krah <kr...@gmail.com>.
Am Freitag, dem 27.03.2026 um 17:44 -0400 schrieb Christopher Schultz:
> Do you have a setting for discardFacades on your <Connector> element
> in
> server.xml?
I am using the embedded Tomcat with Spring Boot 4 and did not customize
that setting.
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Re: Tomcat 11.0.18 - java.lang.AssertionError in Mapper#internalMap
Posted by Christopher Schultz <ch...@christopherschultz.net>.
Torsten,
On 3/24/26 9:42 AM, Torsten Krah wrote:
> eventually while reading logs from my container I stumbled over this
> one:
>
>
> Exception in thread "https-jsse-nio-8443-exec-18" java.lang.AssertionError
> at org.apache.catalina.mapper.Mapper.internalMap(Mapper.java:713)
> at org.apache.catalina.mapper.Mapper.map(Mapper.java:675)
> at org.apache.catalina.connector.CoyoteAdapter.postParseRequest(CoyoteAdapter.java:692)
> at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:336)
> at org.apache.coyote.http2.StreamProcessor.service(StreamProcessor.java:459)
> at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
> at org.apache.coyote.http2.StreamProcessor.process(StreamProcessor.java:102)
> at org.apache.coyote.http2.StreamRunnable.run(StreamRunnable.java:35)
> at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:946)
> at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:480)
> at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:57)
> at java.base/java.lang.Thread.run(Unknown Source)
>
>
> Anyone an idea how this would happen, what might have gone wrong?
That error message was only very recently switched from an
AssertionError to a more descriptive message:
throw new IllegalStateException(sm.getString("mapper.alreadyDone",
mappingData));
The message is "Mapping was already done on this request on [{0}]".
> It did just happen only once, I have no reproducer and no idea which
> request might have triggered this, but I am curious about that trace.
The code path seems to indicate that Tomcat was trying to figure out how
to route the request, but that the work had already been done on the
request. That might point to some odd application behavior where request
objects are being used in very unusual ways, or not properly recycled.
Do you have a setting for discardFacades on your <Connector> element in
server.xml? It shouldn't matter as the facades are not where the real
data are stored, but I'm just curious.
-chris
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