[Echo-list] Problem with component.validation()

[Georg S. <geo...@we...>]

Hallo,

I found a bug in conjunction with validate() and page reloading. If you
have a validate() method that removes and added components and maybe you
have a lot of components in the window doing so :) and maybe then you 
press the reload button of your browser very often you got the following
error:

2004-02-04 17:46:25 test: EchoServer Error Log Reference
#1003_1075913185142
nextapp.echoservlet.EchoServletException: Peer requested for
unregistered component: nextapp.echo.Grid$Cell@ba9b15
	at nextapp.echoservlet.InstancePeer.getPeer(InstancePeer.java:608)
	at nextapp.echoservlet.ui.GridUI.render(GridUI.java:158)
	at nextapp.echoservlet.ContentPaneUI.service(ContentPaneUI.java:283)
	at nextapp.echoservlet.Connection.process(Connection.java:443)
	at nextapp.echoservlet.EchoServer.process(EchoServer.java:304)
	at nextapp.echoservlet.EchoServer.doGet(EchoServer.java:214)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
....

org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
	at java.lang.Thread.run(Thread.java:536)
2004-02-04 17:46:25 test: Error while attempting to invalidate session
as a result of previous error.
nextapp.echoservlet.EchoServletException: Peer requested for
unregistered component: nextapp.echo.Label@18e1674
	at nextapp.echoservlet.InstancePeer.getPeer(InstancePeer.java:608)
	at nextapp.echoservlet.InstancePeer.unregister(InstancePeer.java:1084)
	at nextapp.echoservlet.InstancePeer.remove(InstancePeer.java:993)
	at 
...

In the attachment there is a TestServlet which simulates this 
situation. When running you see that two threads modify the same
datastructure and the error occurs when thread one has removed all
instancePeers while thread two tries to render everything. To show
this I have added also some code to Connection.java (line 467)


  Georg