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java.lang.NullPointerException: 	at org.bimserver.servlets.websockets.jsr356.Jsr356Impl.onOpen(Jsr356Impl.java:66)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)