Bug 58232 - PojoMethodMapping needed - Programatically adding ServerEndpointConfig not possible
PojoMethodMapping needed - Programatically adding ServerEndpointConfig not po...
Product: Tomcat 8
Classification: Unclassified
Component: WebSocket
PC Linux
: P2 normal (vote)
: ----
Assigned To: Tomcat Developers Mailing List
Depends on:
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Reported: 2015-08-11 13:20 UTC by bastian
Modified: 2015-08-13 15:10 UTC (History)
0 users

web.xml (429 bytes, text/xml)
2015-08-12 15:18 UTC, bastian
ExampleContextListener (1.13 KB, text/x-java)
2015-08-12 15:19 UTC, bastian
WebSocketEndpoint (1.39 KB, text/x-java)
2015-08-12 15:19 UTC, bastian
index.html (396 bytes, text/html)
2015-08-12 15:19 UTC, bastian

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Description bastian 2015-08-11 13:20:28 UTC

I'm currently trying to register my own WebsocketEndpoint programatically, i.e. not using the annotations. JSR-356 says this is possible by using the ServerContainer which can be obtained from the ServletContext (see section 6.4). 
The ServerContainer provides two methods that can be used to add a new endpoint. I do not want to use the one that takes a Class<?>, but I need to use the one that takes a ServerEndpointConfig. This is because I want to add some UserProperties to the ServerEndpointConfig before it is added - and I cannot do that when using the method that takes the Class<?>.

When I'm doing this and try it, I get the following exception:

Aug 11, 2015 2:23:52 PM org.apache.coyote.AbstractProtocol$AbstractConnectionHandler process
SEVERE: Error reading request, ignored
	at org.apache.tomcat.websocket.pojo.PojoEndpointBase.doOnOpen(PojoEndpointBase.java:59)
	at org.apache.tomcat.websocket.pojo.PojoEndpointServer.onOpen(PojoEndpointServer.java:70)
	at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.init(WsHttpUpgradeHandler.java:138)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:696)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1521)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1478)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)

When looking at the source of Tomcat, it seems that the method taking the Class<?> adds a userProperty to the ServerEndpointConfig, which contains an instance of PojoMethodMapping. This is not done when directly calling the method that takes the ServerEndpointConfig - and exactly that PojoMethodMapping seems to be missing in my case.

As PojoMethodMapping is not defined by the JSR, but is a Tomcat class, I  would like to not instantiate it myself, but I think the instantiation of PojoMethodMapping should be done in Tomcat in the method taking the ServerEndpointConfig, as the one with the Class<?> parameter calls that one anyway.

I patched tomcat locally and it seems to work for me after that adjustment. I therefore propose that this adjustment be integrated into trunk.
I will upload my changes to GitHub right away and add a comment with the link here.

Comment 2 Violeta Georgieva 2015-08-12 14:57:29 UTC

Can you please provide a simple test. I cannot reproduce the behavior that you are describing.

Best Regards,
Comment 3 bastian 2015-08-12 15:18:17 UTC

Thanks for replying that fast :)

Sure, I can:

* New .war project
* Provide a Context Listener in the web.xml
* In context listener register a WebsocketEndpoint suing a ServerEndpointConfig
* access Websocket from web
* Exception.

I'll attach my example files...
Comment 4 bastian 2015-08-12 15:18:58 UTC
Created attachment 32993 [details]
Comment 5 bastian 2015-08-12 15:19:23 UTC
Created attachment 32994 [details]
Comment 6 bastian 2015-08-12 15:19:36 UTC
Created attachment 32995 [details]
Comment 7 bastian 2015-08-12 15:19:47 UTC
Created attachment 32996 [details]
Comment 8 Violeta Georgieva 2015-08-13 15:10:35 UTC

Thanks for the report and the patch. I added a test case also.
The fix is available in trunk, 8.0.x (for 8.0.25 onwards) and 7.0.x (for 7.0.64 onwards)