java.lang.NullPointerException: null
Searched on Google with the first line of a JAVA stack trace?
We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.
Recommended solutions based on your search
Solutions on the web
via GitHub by jrmartin
, 1 year agovia GitHub by joseph-devito
, 2 years agovia GitHub by jrmartin
, 7 months agovia GitHub by YuriyKravtsov
, 2 years agovia GitHub by hasancelik
, 2 years agovia GitHub by erichwang
, 1 year agojava.lang.NullPointerException: null
at java.util.concurrent.ConcurrentHashMap.hash(ConcurrentHashMap.java:333)
at java.util.concurrent.ConcurrentHashMap.remove(ConcurrentHashMap.java:1175)
at org.geppetto.frontend.controllers.ConnectionsManager.removeConnection(ConnectionsManager.java:96)
at org.geppetto.frontend.controllers.ConnectionsManager.purgeLostConnections(ConnectionsManager.java:82)
at org.geppetto.frontend.controllers.ConnectionsManager.addConnection(ConnectionsManager.java:54)
at org.geppetto.frontend.controllers.WebsocketConnection.onOpen(WebsocketConnection.java:122)
at org.apache.catalina.websocket.StreamInbound.onUpgradeComplete(StreamInbound.java:240)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)