ApplicationListener is missing from Collection returned by getApplicationListeners() if it was added after the multicaster was initialised [SPR-17324]

[spring-projects-issues]

Andy Wilkinson opened SPR-17324 and commented

In Boot, if context refresh fails, we publish an ApplicationFailedEvent. We can't rely on the context's multicaster being available at this point so we create our own. It is initialised with the collection of listeners returned by AbstractApplicationContext.getApplicationListeners(). Unfortunately, any listeners that were added after the context's multicaster was initialised are missing from this collection so they do not receive the ApplicationFailedEvent.

In AbstractApplicationContext.addApplicationListener(ApplicationListener<?>), would it be possible to always call this.applicationListeners.add(listener) rather than only calling it when this.applicationEventMulticaster is null?

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Affects: 5.0.9

Reference URL: spring-projects/spring-boot#14490

Issue Links:

• Unnecessary sort in AbstractApplicationEventMulticaster [SPR-17307] #21840 Unnecessary sort in AbstractApplicationEventMulticaster

Referenced from: commits c8c0737, d61a7ed

Backported to: 5.0.10