bug::특정 상황에서 NPE 발생

[SeJonJ]

아래 상황에서 NPE 발생

• 방이 삭제된 이후 방에서 퇴장했을 때 발생하는 에러로 추정됨.
• 방 안에 참여 인원이 있을때도 방 삭제가 가능한지 확인 후 수정필요

2024-04-25 08:37:35.444  INFO 1 --- [nio-8443-exec-8] webChat.service.chat.ChatServiceMain     : 삭제 완료 roomId : af327e6b-3537-464e-b4df-d3104c434b2e
2024-04-25 08:37:54.555  INFO 1 --- [nio-8443-exec-3] webChat.controller.ChatController        : DisConnEvent SessionDisconnectEvent[sessionId=ydthnsti, CloseStatus[code=1000, reason=null]]
2024-04-25 08:37:54.555  INFO 1 --- [nio-8443-exec-3] webChat.controller.ChatController        : headAccessor StompHeaderAccessor [headers={simpMessageType=DISCONNECT, stompCommand=DISCONNECT, simpSessionAttributes={roomId=af327e6b-3537-464e-b4df-d3104c434b2e, userUUID=d0df36b2-78ec-4dc5-a268-fcc5145bfe1c}, simpSessionId=ydthnsti}]
2024-04-25 08:37:54.560 ERROR 1 --- [nio-8443-exec-3] o.s.w.s.m.StompSubProtocolHandler        : Error publishing SessionDisconnectEvent[sessionId=ydthnsti, CloseStatus[code=1000, reason=null]]

java.lang.NullPointerException: null
	at webChat.service.chat.ChatServiceMain.minusUserCnt(ChatServiceMain.java:85) ~[classes!/:na]
	at webChat.controller.ChatController.webSocketDisconnectListener(ChatController.java:89) ~[classes!/:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
	at org.springframework.context.event.ApplicationListenerMethodAdapter.doInvoke(ApplicationListenerMethodAdapter.java:344) ~[spring-context-5.3.22.jar!/:5.3.22]
	at org.springframework.context.event.ApplicationListenerMethodAdapter.processEvent(ApplicationListenerMethodAdapter.java:229) ~[spring-context-5.3.22.jar!/:5.3.22]
	at org.springframework.context.event.ApplicationListenerMethodAdapter.onApplicationEvent(ApplicationListenerMethodAdapter.java:166) ~[spring-context-5.3.22.jar!/:5.3.22]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:176) ~[spring-context-5.3.22.jar!/:5.3.22]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:169) ~[spring-context-5.3.22.jar!/:5.3.22]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:143) ~[spring-context-5.3.22.jar!/:5.3.22]
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:421) ~[spring-context-5.3.22.jar!/:5.3.22]
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:378) ~[spring-context-5.3.22.jar!/:5.3.22]
	at org.springframework.web.socket.messaging.StompSubProtocolHandler.publishEvent(StompSubProtocolHandler.java:415) ~[spring-websocket-5.3.22.jar!/:5.3.22]
	at org.springframework.web.socket.messaging.StompSubProtocolHandler.afterSessionEnded(StompSubProtocolHandler.java:650) ~[spring-websocket-5.3.22.jar!/:5.3.22]
	at org.springframework.web.socket.messaging.SubProtocolWebSocketHandler.clearSession(SubProtocolWebSocketHandler.java:530) ~[spring-websocket-5.3.22.jar!/:5.3.22]
	at org.springframework.web.socket.messaging.SubProtocolWebSocketHandler.afterConnectionClosed(SubProtocolWebSocketHandler.java:399) ~[spring-websocket-5.3.22.jar!/:5.3.22]
	at org.springframework.web.socket.handler.WebSocketHandlerDecorator.afterConnectionClosed(WebSocketHandlerDecorator.java:85) ~[spring-websocket-5.3.22.jar!/:5.3.22]
	at org.springframework.web.socket.handler.LoggingWebSocketHandlerDecorator.afterConnectionClosed(LoggingWebSocketHandlerDecorator.java:72) ~[spring-websocket-5.3.22.jar!/:5.3.22]
	at org.springframework.web.socket.handler.ExceptionWebSocketHandlerDecorator.afterConnectionClosed(ExceptionWebSocketHandlerDecorator.java:78) ~[spring-websocket-5.3.22.jar!/:5.3.22]
	at org.springframework.web.socket.sockjs.transport.session.AbstractSockJsSession.delegateConnectionClosed(AbstractSockJsSession.java:439) ~[spring-websocket-5.3.22.jar!/:5.3.22]
	at org.springframework.web.socket.sockjs.transport.handler.SockJsWebSocketHandler.afterConnectionClosed(SockJsWebSocketHandler.java:98) ~[spring-websocket-5.3.22.jar!/:5.3.22]
	at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter.onClose(StandardWebSocketHandlerAdapter.java:145) ~[spring-websocket-5.3.22.jar!/:5.3.22]
	at org.apache.tomcat.websocket.WsSession.fireEndpointOnClose(WsSession.java:767) ~[tomcat-embed-websocket-9.0.65.jar!/:na]
	at org.apache.tomcat.websocket.WsSession.onClose(WsSession.java:748) ~[tomcat-embed-websocket-9.0.65.jar!/:na]
	at org.apache.tomcat.websocket.WsFrameBase.processDataControl(WsFrameBase.java:367) ~[tomcat-embed-websocket-9.0.65.jar!/:na]
	at org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:296) ~[tomcat-embed-websocket-9.0.65.jar!/:na]
	at org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:133) ~[tomcat-embed-websocket-9.0.65.jar!/:na]
	at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:85) ~[tomcat-embed-websocket-9.0.65.jar!/:na]
	at org.apache.tomcat.websocket.server.WsFrameServer.doOnDataAvailable(WsFrameServer.java:183) ~[tomcat-embed-websocket-9.0.65.jar!/:na]
	at org.apache.tomcat.websocket.server.WsFrameServer.notifyDataAvailable(WsFrameServer.java:162) ~[tomcat-embed-websocket-9.0.65.jar!/:na]
	at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.upgradeDispatch(WsHttpUpgradeHandler.java:157) ~[tomcat-embed-websocket-9.0.65.jar!/:na]
	at org.apache.coyote.http11.upgrade.UpgradeProcessorInternal.dispatch(UpgradeProcessorInternal.java:60) ~[tomcat-embed-core-9.0.65.jar!/:na]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:59) ~[tomcat-embed-core-9.0.65.jar!/:na]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:890) ~[tomcat-embed-core-9.0.65.jar!/:na]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1789) ~[tomcat-embed-core-9.0.65.jar!/:na]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.65.jar!/:na]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-9.0.65.jar!/:na]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-9.0.65.jar!/:na]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.65.jar!/:na]
	at java.base/java.lang.Thread.run(Thread.java:829) ~[na:na]

[SeJonJ]

버그 수정 완료 서버 배포 후 테스트 진행 예정