The relevant stacktrace:

[ERROR] java.lang.NullPointerException

[ERROR]         at org.jboss.errai.bus.server.servlet.JettyContinuationsServlet.pollForMessages(JettyContinuationsServlet.java:92)

[ERROR]         at org.jboss.errai.bus.server.servlet.JettyContinuationsServlet.doGet(JettyContinuationsServlet.java:55)

In the latest SNAPSHOT in the JettyContinuationServlet I can see the following from line 91:

[...]

91      final MessageQueue queue = service.getBus().getQueue(session);

92     queue.heartBeat();

93

94      if (queue == null) {

[...]

Could the queue.hearBeat() be moved after the null-check?

Cheers,

V.