AbstractApplicationEventMulticaster returns multiple instances of same listener for getApplicationListeners() [SPR-7204]

[spring-projects-issues]

Casey Hadden opened SPR-7204 and commented

AbstractApplicationEventMulticaster has two getApplicationListeners methods. The no parameter method will return duplicate listeners in its list while the one subsetting by event type does not.

It appears that when the default ListenerRetriever class is iterating over the listenerBeanNames the add call should be protected by a !allListeners.contains(listener) check like the event subset method is.

Attached is a zip file which shows the two listeners printed from the no parameter method while only one is printed from the event type method.

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Affects: 3.0 GA, 3.0.1, 3.0.2

Attachments:

• AbstractApplicationEventMulticaster.zip (1.41 kB)

Referenced from: commits 738d84f

[spring-projects-issues]

Juergen Hoeller commented

Good point. Plain getApplicationListeners() isn't used in the default multicaster infrastructure anymore (as of Spring 3.0) - but for custom multicaster subclasses, it should nevertheless have equivalent behavior.

Juergen