https://issues.apache.org/bugzilla/show_bug.cgi?id=57326
Bug ID: 57326
Summary: AsyncContextImpl doesn't allow AsyncListener to
re-register themselves when firing onStartAsync
Product: Tomcat 7
Version: trunk
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: efou...@voyages-sncf.com
According to the official Java EE Javadoc (cf.
https://docs.oracle.com/javaee/7/api/javax/servlet/AsyncListener.html#onStartAsync%28javax.servlet.AsyncEvent%29),
AsyncListeners should be allowed to re-register themselves when the event
"onStartAsync" is started : "This AsyncListener will not receive any events
related to the new asynchronous cycle unless it registers itself (via a call to
AsyncContext.addListener(javax.servlet.AsyncListener)) with the AsyncContext
that is delivered as part of the given AsyncEvent.".
In tomcat 7.0.x, the actual implementation prevents this behavior since the
listeners list is cleared *after* firing the event (cf.
AdyncContextImpl.java:366). If the list was cleared before firing the event,
listeners would be able to re-register themselves if needed.
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