Deadlock in WsRemoteEndpointImplServer.onWritePossible

Issue

• We hit the following deadlock:

http-/0.0.0.0:8080-1":
        at org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.onWritePossible(WsRemoteEndpointImplServer.java:93)
        - waiting to lock <0x00000006dee6a1a8> (a java.nio.HeapByteBuffer)
        - locked <0x00000006dee6a200> (a java.lang.Object)
        at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsWriteListener.onWritePossible(WsHttpUpgradeHandler.java:243)
        at org.apache.catalina.core.StandardWrapperValve.async(StandardWrapperValve.java:605)
        at org.apache.catalina.core.StandardWrapperValve.event(StandardWrapperValve.java:350)
        at org.apache.catalina.core.StandardContextValve.event(StandardContextValve.java:171)
        at org.apache.catalina.valves.ValveBase.event(ValveBase.java:185)
        at org.apache.catalina.core.StandardHostValve.event(StandardHostValve.java:252)
        at org.apache.catalina.valves.ValveBase.event(ValveBase.java:185)
        at org.apache.catalina.core.StandardEngineValve.event(StandardEngineValve.java:121)
        at org.apache.catalina.connector.CoyoteAdapter.event(CoyoteAdapter.java:228)
        at org.apache.coyote.http11.Http11NioProcessor.event(Http11NioProcessor.java:232)
        at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.event(Http11NioProtocol.java:818)
        at org.apache.tomcat.util.net.NioEndpoint$ChannelProcessor.run(NioEndpoint.java:939)
        - locked <0x00000006deeeb9c0> (a java.lang.Object)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at org.apache.tomcat.util.net.NioEndpoint$DefaultThreadFactory$1$1.run(NioEndpoint.java:1249)
        at java.lang.Thread.run(Thread.java:745)
"EJB default - 1":
        at org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.onWritePossible(WsRemoteEndpointImplServer.java:81)
        - waiting to lock <0x00000006dee6a200> (a java.lang.Object)
        at org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.doWrite(WsRemoteEndpointImplServer.java:76)
        at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(WsRemoteEndpointImplBase.java:444)
        at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessage(WsRemoteEndpointImplBase.java:334)
        at org.apache.tomcat.websocket.WsRemoteEndpointImplBase$TextMessageSendHandler.write(WsRemoteEndpointImplBase.java:741)
        - locked <0x00000006dee6a1a8> (a java.nio.HeapByteBuffer)
        at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendPartialString(WsRemoteEndpointImplBase.java:239)
        at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendString(WsRemoteEndpointImplBase.java:182)
        at org.apache.tomcat.websocket.WsRemoteEndpointBasic.sendText(WsRemoteEndpointBasic.java:37)