https://issues.apache.org/bugzilla/show_bug.cgi?id=54716
Bug ID: 54716
Summary: WebSocket implementation "freaks out" if Session
closed or exception thrown from onOpen method
Product: Tomcat 8
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: major
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: nicho...@nicholaswilliams.net
Classification: Unclassified
If Session#close() is called from an onOpen method, the container throws a
NullPointerException, as evidenced below:
Mar 17, 2013 10:57:50 PM
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler process
SEVERE: Error reading request, ignored
java.lang.IllegalArgumentException: Failed to call onOpen method of POJO end
point for POJO of type [com.wrox.chat.ChatEndpoint]
at
org.apache.tomcat.websocket.pojo.PojoEndpointBase.doOnOpen(PojoEndpointBase.java:54)
at
org.apache.tomcat.websocket.pojo.PojoEndpointServer.onOpen(PojoEndpointServer.java:69)
at
org.apache.tomcat.websocket.server.WsProtocolHandler.init(WsProtocolHandler.java:107)
at
org.apache.coyote.http11.upgrade.AbstractProcessor.<init>(AbstractProcessor.java:51)
at
org.apache.coyote.http11.upgrade.NioProcessor.<init>(NioProcessor.java:31)
at
org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.createUpgradeProcessor(Http11NioProtocol.java:309)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:634)
at
org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1581)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1540)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:487)
at
org.apache.tomcat.websocket.pojo.PojoEndpointBase.doOnOpen(PojoEndpointBase.java:51)
... 12 more
Caused by: java.lang.NullPointerException
at
org.apache.tomcat.websocket.BackgroundProcessManager.unregister(BackgroundProcessManager.java:75)
at
org.apache.tomcat.websocket.WsWebSocketContainer.unregisterSession(WsWebSocketContainer.java:283)
at
org.apache.tomcat.websocket.server.WsServerContainer.unregisterSession(WsServerContainer.java:283)
at
org.apache.tomcat.websocket.WsSession.sendCloseMessage(WsSession.java:357)
at org.apache.tomcat.websocket.WsSession.close(WsSession.java:305)
at com.wrox.chat.ChatEndpoint.onOpen(ChatEndpoint.java:54)
... 17 more
If this or any other exceptions are thrown from an onOpen method, even if the
session isn't closed, Tomcat starts randomly rejecting a handful of requests
with no explanation in the logs, and on shut down dozens of these errors appear
on stderr:
Mar 17, 2013 11:22:11 PM org.apache.tomcat.util.modeler.Registry
unregisterComponent
SEVERE: Error unregistering mbean
javax.management.RuntimeOperationsException: Object name cannot be null
at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.isRegistered(DefaultMBeanServerInterceptor.java:569)
at
com.sun.jmx.mbeanserver.JmxMBeanServer.isRegistered(JmxMBeanServer.java:628)
at
org.apache.tomcat.util.modeler.Registry.unregisterComponent(Registry.java:420)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.unregister(AbstractProtocol.java:768)
at
org.apache.coyote.AbstractProtocol$RecycledProcessors.clear(AbstractProtocol.java:820)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.recycle(AbstractProtocol.java:578)
at
org.apache.tomcat.util.net.NioEndpoint.releaseCaches(NioEndpoint.java:318)
at org.apache.tomcat.util.net.NioEndpoint.unbind(NioEndpoint.java:481)
at
org.apache.tomcat.util.net.AbstractEndpoint.destroy(AbstractEndpoint.java:675)
at org.apache.coyote.AbstractProtocol.destroy(AbstractProtocol.java:522)
at
org.apache.catalina.connector.Connector.destroyInternal(Connector.java:1020)
at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:305)
at
org.apache.catalina.core.StandardService.destroyInternal(StandardService.java:584)
at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:305)
at
org.apache.catalina.core.StandardServer.destroyInternal(StandardServer.java:835)
at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:305)
at org.apache.catalina.startup.Catalina.stop(Catalina.java:719)
at org.apache.catalina.startup.Catalina.start(Catalina.java:680)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:487)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:357)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:491)
Caused by: java.lang.IllegalArgumentException: Object name cannot be null
... 24 more
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