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https://issues.apache.org/jira/browse/CXF-8745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17679152#comment-17679152
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Eric commented on CXF-8745:
---------------------------
Sorry, this has taken a long time for a very small snippet of code :)
https://github.com/apache/cxf/pull/1077
> MemoryLeak when using SpringBus in a spring context which has a reusable
> parent context
> ---------------------------------------------------------------------------------------
>
> Key: CXF-8745
> URL: https://issues.apache.org/jira/browse/CXF-8745
> Project: CXF
> Issue Type: Bug
> Components: Bus
> Affects Versions: 3.5.3
> Reporter: Eric
> Priority: Minor
>
> SpringBus automatically registers itself as an ApplicationListener in the
> SpringContext and recursively also in all its parents:
>
> {code:java}
> public void setApplicationContext(ApplicationContext applicationContext) {
> ctx = (AbstractApplicationContext)applicationContext;
> @SuppressWarnings("rawtypes")
> ApplicationListener listener = new ApplicationListener() {
> public void onApplicationEvent(ApplicationEvent event) {
> SpringBus.this.onApplicationEvent(event);
> }
> };
> ctx.addApplicationListener(listener);
> ApplicationContext ac = applicationContext.getParent();
> while (ac != null) {
> if (ac instanceof AbstractApplicationContext) {
>
> ((AbstractApplicationContext)ac).addApplicationListener(listener);
> }
> ac = ac.getParent();
> }
> }{code}
> This leads to a MemoryLeak when the current SpringContext is closed but the
> ParentContext is reused for another child context, because the
> ApplicationListener references the SpringBus and the SpringBus references the
> old ApplicationContext.
>
> A very simple approach to solve this problem would be to deregister the
> listener in a destroy-block or to just use a WeakReference. The later is also
> used by spring itself when they register a listener in the parent to
> automatically close all related child contexts.
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