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

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via Stack Overflow by aryanRaj_kary
, 2 months ago
This exception has no message.
via Google Groups by Balaji, 2 years ago
via Google Groups by Sujit, 2 years ago
via Atlassian JIRA by Seb Ruiz, 1 year ago
This exception has no message.
via Atlassian JIRA by Steve Smith [SYD/AMS/LHR], 1 year ago
This exception has no message.
java.lang.NullPointerException:
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
at org.springframework.session.web.socket.handler.WebSocketRegistryListener.registerWsSession(WebSocketRegistryListener.java:118)
at org.springframework.session.web.socket.handler.WebSocketRegistryListener.afterConnectionEstablished(WebSocketRegistryListener.java:86)
at org.springframework.session.web.socket.handler.WebSocketRegistryListener.onApplicationEvent(WebSocketRegistryListener.java:67)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:166)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:382)

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