java.lang.NullPointerException: This exception has no message.

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via GitHub by knockoutuser
, 2 years ago
This exception has no message.
via Stack Overflow by jasiuuu
, 1 year ago
java.lang.NullPointerException:
at org.apache.tomcat.websocket.server.WsServerContainer.unregisterAuthenticatedSession(WsServerContainer.java:367)
at org.apache.tomcat.websocket.server.WsServerContainer.unregisterSession(WsServerContainer.java:344)
at org.apache.tomcat.websocket.WsSession.sendCloseMessage(WsSession.java:494)
at org.apache.tomcat.websocket.WsSession.doClose(WsSession.java:417)
at org.apache.tomcat.websocket.WsSession.close(WsSession.java:394)
at org.apache.tomcat.websocket.server.WsServerContainer.closeAuthenticatedSession(WsServerContainer.java:377)
at org.apache.catalina.session.StandardSession.expire(StandardSession.java:808)
at org.apache.catalina.session.StandardSession.isValid(StandardSession.java:658)
at org.apache.catalina.session.ManagerBase.processExpires(ManagerBase.java:534)
at org.apache.catalina.session.ManagerBase.backgroundProcess(ManagerBase.java:519)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1352)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1530)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)
at java.lang.Thread.run(Unknown Source)

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