https://bz.apache.org/bugzilla/show_bug.cgi?id=59219
Bug ID: 59219
Summary: AsyncListener#onError not called on exception during
async processing
Product: Tomcat 8
Version: 8.0.32
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: nisco...@googlemail.com
There are a couple of problems relating to error handling during exception
processing. Basically, Tomcat should ensure that the AsyncListener onError
and onComplete methods are correctly called if an exception occurs during
async processing in order to allow the listener code to release resources
and do clean-up. This does not seem to happen.
A sample servlet demonstrating the problem, AsyncDebugListener, is provided
at the following location:
https://github.com/msnicklous/AsyncDebug
Build the AsyncDebugListener module using 'mvn install' and deploy it on
Tomcat.
The service method and each of the AsyncListener methods logs output to the
AsyncListener.log file. You can follow execution by looking at the logs.
Assuming Tomcat is installed locally, you can use the following URLs:
1) No error - works correctly:
http://localhost:8080/AsyncDebugListener/ltest?reps=3
2) Exception during service method
http://localhost:8080/AsyncDebugListener/ltest?err
If async processing is started and an exception is thrown before the end of
the service method, AsyncListener#onError is not called, however onTimeout
followed by onComplete are both called.
This is incorrect, as onError followed by onComplete should be called.
3) Exception during processing of AsyncContext#dispatch() target
http://localhost:8080/AsyncDebugListener/ltest?reps=3&err
Precondition: Async processing is started and the request is dispatched using
AsyncContext#dispatch(). The service method returns to the container.
If the container performs the resulting async dispatch and an exception is
thrown, Tomcat drops the connection to the browser and no AsyncListener method
is called.
This is incorrect. Tomcat should flush the contents of the buffer to the
browser and call the AsyncListener onError followed by the onComplete methods.
Thanks for having a look at this!
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