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Posted to users@tomcat.apache.org by Evil Bit <ev...@zoho.com> on 2015/01/15 15:34:39 UTC

Fwd: NullPointerException in websocket endpoint onerror

We're seeing the following issue with a websocket endpoint on tomcat 8.0.15 when OnError tries to close the websocket session. What could be the problem?

java.lang.reflect.InvocationTargetException
        at sun.reflect.GeneratedMethodAccessor91.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.tomcat.websocket.pojo.PojoEndpointBase.onError(PojoEndpointBase.java:134)
        at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.onError(WsHttpUpgradeHandler.java:167)
        at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.access$300(WsHttpUpgradeHandler.java:48)
        at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsReadListener.onError(WsHttpUpgradeHandler.java:228)
        at org.apache.coyote.http11.upgrade.AbstractServletInputStream.onError(AbstractServletInputStream.java:209)
        at org.apache.coyote.http11.upgrade.Nio2ServletInputStream$1.failed(Nio2ServletInputStream.java:76)
        at org.apache.coyote.http11.upgrade.Nio2ServletInputStream$1.failed(Nio2ServletInputStream.java:49)
        at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:128)
        at sun.nio.ch.Invoker$2.run(Invoker.java:218)
        at sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
        at org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.onWritePossible(WsRemoteEndpointImplServer.java:96)
        at org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.doWrite(WsRemoteEndpointImplServer.java:81)
        at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(WsRemoteEndpointImplBase.java:444)
        at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessage(WsRemoteEndpointImplBase.java:335)
        at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessageBlock(WsRemoteEndpointImplBase.java:264)
        at org.apache.tomcat.websocket.WsSession.sendCloseMessage(WsSession.java:536)
        at org.apache.tomcat.websocket.WsSession.doClose(WsSession.java:464)
        at org.apache.tomcat.websocket.WsSession.close(WsSession.java:441)
        at com.testEndpoint.onWebSocketError(WebsocketEndpoint.java:52)

Re: Fwd: NullPointerException in websocket endpoint onerror

Posted by Mark Thomas <ma...@apache.org>.
On 15/01/2015 14:34, Evil Bit wrote:
> We're seeing the following issue with a websocket endpoint on tomcat 8.0.15 when OnError tries to close the websocket session. What could be the problem?

Most likely that what ever triggered the error has already closed the
socket. It looks like some null checks are required in there somewhere.

Mark


> 
> java.lang.reflect.InvocationTargetException
>         at sun.reflect.GeneratedMethodAccessor91.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:606)
>         at org.apache.tomcat.websocket.pojo.PojoEndpointBase.onError(PojoEndpointBase.java:134)
>         at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.onError(WsHttpUpgradeHandler.java:167)
>         at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.access$300(WsHttpUpgradeHandler.java:48)
>         at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsReadListener.onError(WsHttpUpgradeHandler.java:228)
>         at org.apache.coyote.http11.upgrade.AbstractServletInputStream.onError(AbstractServletInputStream.java:209)
>         at org.apache.coyote.http11.upgrade.Nio2ServletInputStream$1.failed(Nio2ServletInputStream.java:76)
>         at org.apache.coyote.http11.upgrade.Nio2ServletInputStream$1.failed(Nio2ServletInputStream.java:49)
>         at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:128)
>         at sun.nio.ch.Invoker$2.run(Invoker.java:218)
>         at sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>         at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
>         at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.NullPointerException
>         at org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.onWritePossible(WsRemoteEndpointImplServer.java:96)
>         at org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.doWrite(WsRemoteEndpointImplServer.java:81)
>         at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(WsRemoteEndpointImplBase.java:444)
>         at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessage(WsRemoteEndpointImplBase.java:335)
>         at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessageBlock(WsRemoteEndpointImplBase.java:264)
>         at org.apache.tomcat.websocket.WsSession.sendCloseMessage(WsSession.java:536)
>         at org.apache.tomcat.websocket.WsSession.doClose(WsSession.java:464)
>         at org.apache.tomcat.websocket.WsSession.close(WsSession.java:441)
>         at com.testEndpoint.onWebSocketError(WebsocketEndpoint.java:52)
> 
> 
> 


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