AbstractMethodError: org/apache/excalibur/event/impl/AbstractQueue.enqueue

[Mu Mike]

I have this block of code:

   final FortressConfig config = new FortressConfig();
   config.setContextDirectory("");
   config.setWorkDirectory("");
   config.setContainerConfiguration("systemTRY.xconf");
   config.setRoleManagerConfiguration("reportTRY.roles");
//    config.setLoggerManagerConfiguration("logkit.xconf");
   ContainerManager cm = new
             DefaultContainerManager(config.getContext());
   
   ContainerUtil.initialize( cm );

   DefaultContainer container = (DefaultContainer) cm.getContainer();
   ServiceManager manager = container.getServiceManager();
//    ServiceSelector selector = (ServiceSelector) 
manager.lookup(Runner.ROLE+"Selector");
//    Runner service=(Runner)selector.select("Runner.Another");

   Runner service=(Runner)manager.lookup(Runner.ROLE);
   System.out.println(service.getName());
   container.getServiceManager().release(service);
   org.apache.avalon.framework.container.ContainerUtil.dispose( cm );
reportTRY.roles

<?xml version="1.0"?>
<role-list>
 <role name="Runner">
   <component shorthand="Runner" class="DefaultRunner"/>
 </role>
</role-list>
systemTRY.xconf

<my-system>
 <Runner id="Runner" name="I M DEFAULT RUNNER"/>
</my-system>
when I ran this code, it could lookup the service well,but when I debug 
this code to this statement 
   ContainerManager cm = new
             DefaultContainerManager(config.getContext());

and once I stepped this statement, it kept throwing the following 
exception:

java.lang.AbstractMethodError: 
org/apache/excalibur/event/impl/AbstractQueue.enqueue
	at 
org.apache.excalibur.event.command.AbstractThreadManager$PipelineRunner.run(AbstractThreadManager.java:310)

	at 
EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:727)

	at java.lang.Thread.run(Thread.java:484)

why is this?

Thanks
Mike
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