Hello,
I have an issue using Jetty and WebSockets related to class loading. I have a
class set up as a web service endpoint using java annotations. In the onOpen()
method. I create an instance of the MyClient class. The MyClient class uses
the Apache Commons Lang EventListenerSupport which requires passing an
interface class object in. The interface is “MyInterface”. When constructing
the MyClient object, I get an exception saying the class can’t be loaded
because it is not visible from the class loader. The MyClient and the
MyInterace classes are both public, both in the same package, and both in the
same jar file. I am very confused as to why the class loader can find the
MyClient class but not the MyInterface class.
The Commons Lang jar file is also in the WEB-INF/lib directory as well. I have
listed the classes and the exception I am getting. Any ideas on what the
problem might be, or how to debug it would be helpful.
## My Client Class
package com.example;
public class MyClient {
private EventListenerSupport<MyInterface> listeners;
public MyClient() {
this.listeners = EventListenerSupport.create(MyInterface.class);
}
}
## MyInterface
package com.example;
public interface MyInterface {
void onClientConnected();
}
java.lang.IllegalArgumentException: interface com.example.MyInterface is not
visible from class loader
at java.lang.reflect.Proxy$ProxyClassFactory.apply(Proxy.java:616)
at java.lang.reflect.Proxy$ProxyClassFactory.apply(Proxy.java:592)
at java.lang.reflect.WeakCache$Factory.get(WeakCache.java:244)
at java.lang.reflect.WeakCache.get(WeakCache.java:141)
at java.lang.reflect.Proxy.getProxyClass0(Proxy.java:455)
at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:738)
at
org.apache.commons.lang3.event.EventListenerSupport.createProxy(EventListenerSupport.java:277)
at
org.apache.commons.lang3.event.EventListenerSupport.initializeTransientFields(EventListenerSupport.java:268)
at
org.apache.commons.lang3.event.EventListenerSupport.<init>(EventListenerSupport.java:144)
at
org.apache.commons.lang3.event.EventListenerSupport.<init>(EventListenerSupport.java:122)
at
org.apache.commons.lang3.event.EventListenerSupport.create(EventListenerSupport.java:106)
at com.example.MyClient.<init>(ClientProxy.java:55)
at com.example.WebSocketSessionManager.onOpen(WebSocketSessionManager.java:50)
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:606)
at
org.eclipse.jetty.websocket.common.events.annotated.CallableMethod.call(CallableMethod.java:71)
at
org.eclipse.jetty.websocket.jsr356.annotations.OnOpenCallable.call(OnOpenCallable.java:54)
at
org.eclipse.jetty.websocket.jsr356.annotations.JsrEvents.callOpen(JsrEvents.java:162)
at
org.eclipse.jetty.websocket.jsr356.endpoints.JsrAnnotatedEventDriver.onConnect(JsrAnnotatedEventDriver.java:185)
at
org.eclipse.jetty.websocket.common.events.AbstractEventDriver.openSession(AbstractEventDriver.java:220)
at
org.eclipse.jetty.websocket.jsr356.endpoints.AbstractJsrEventDriver.openSession(AbstractJsrEventDriver.java:104)
at
org.eclipse.jetty.websocket.common.WebSocketSession.open(WebSocketSession.java:406)
at
org.eclipse.jetty.websocket.server.WebSocketServerConnection.onOpen(WebSocketServerConnection.java:63)
at org.eclipse.jetty.server.HttpConnection.completed(HttpConnection.java:339)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:420)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:248)
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:606)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:535)
at java.lang.Thread.run(Thread.java:745)
Michael S. MacFadden
Technical Director and Chief Engineer
SOLUTE, Inc.
4250 Pacific Highway, Suite 211
San Diego, CA 92110
Office: (619) 758-9900
Cell: (585) 259-0529
[email protected]<mailto:[email protected]>
www.solute.us<http://www.solute.us/>
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