Failed to persist session attribute with Websocket endpoints ------------------------------------------------------------ Key: WFLY-13941 URL: https://issues.redhat.com/browse/WFLY-13941 Project: WildFly Issue Type: Bug Components: Web Sockets Affects Versions: 13.0.0.Final Reporter: Abi Sarwan Assignee: Flavia Rainone Priority: Major Attachments: mavenproject1-1.0.war When WildFly is configured to persist sessions (standalone mode) during restart/redeploy and contains a websocket endpoint, a NotSerializableException is thrown: Failed to persist session attribute io.undertow.websocket.current-connections with value [WebSocket13Channel peer /127.0.0.1:64853 local /127.0.0.1:8080[ No Receiver [] -- [] -- []]] for session xxxxxxxx: java.io.NotSerializableException: io.undertow.websockets.core.protocol.version13.WebSocket13Channel   This start to happen in wildfly 13. The deployment works fine in wildfly 12.