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Thomas Heigl edited comment on WICKET-6944 at 1/10/22, 6:28 PM: ---------------------------------------------------------------- [~mgrigorov]: Do you have any idea how to best solve this? I think we should keep the listener in a field and remove it when the connection is closed. Or maybe there is an alternative to the listener, to check if the app is still alive. was (Author: thomas.heigl): [~mgrigorov]: Do you have any idea how to best solve this? I think we should keep the listener in a field and remove it when the connection is closed. > Memory leak in WicketEndpoint > ----------------------------- > > Key: WICKET-6944 > URL: https://issues.apache.org/jira/browse/WICKET-6944 > Project: Wicket > Issue Type: Bug > Components: wicket-native-websocket > Affects Versions: 9.7.0 > Reporter: Thomas Heigl > Assignee: Thomas Heigl > Priority: Major > Attachments: image-2022-01-10-18-52-42-193.png > > > Our application OOMed yesterday after about 2-3 weeks of continuous uptime. > We normally deploy every other day, so we never noticed this issue before. > The heap dump identified the possible culprit as > {{{}WicketEndpoint$ApplicationListener{}}}: > !image-2022-01-10-18-52-42-193.png! > Every new websocket connection registers a new instance of this application > listener and after a while we ended up with millions of these listeners: > {code:java} > @Override > public void onOpen(Session session, EndpointConfig endpointConfig) > { > String appName = getApplicationName(session); > WebApplication app = (WebApplication) WebApplication.get(appName); > app.getApplicationListeners().add(new > ApplicationListener(applicationDestroyed)); > try > { > ThreadContext.setApplication(app); > javaxWebSocketProcessor = new JavaxWebSocketProcessor(session, app, > endpointConfig); > } > finally > { > ThreadContext.detach(); > } > } > {code} > Instead of creating a new listener for every connection, the listener should > be a singleton. -- This message was sent by Atlassian Jira (v8.20.1#820001)