The exception happens every ~10 seconds on the WIAB server during last couple days.

wiab_server_exception.java

2011-04-15 09:05:58.760:DBUG::async request [GET /socket.io/xhr-multipart/]@5547667 org.eclipse.jetty.server.Request@54a693
2011-04-15 09:05:58.760:DBUG::REQUEST /socket.io/xhr-multipart/ on org.eclipse.jetty.server.nio.SelectChannelConnector$2@1f0940a
2011-04-15 09:05:58.760:DBUG::sessionManager=org.eclipse.jetty.server.session.HashSessionManager@365dc0
2011-04-15 09:05:58.760:DBUG::session=null
2011-04-15 09:05:58.760:DBUG::servlet=org.waveprotocol.box.server.rpc.ServerRpcProvider$WaveSocketIOServlet-18074979
2011-04-15 09:05:58.760:DBUG::servlet holder= org.waveprotocol.box.server.rpc.ServerRpcProvider$WaveSocketIOServlet-18074979
2011-04-15 09:05:58.760:DBUG::chain= null
2011-04-15 09:05:58.760:WARN::Committed before 404 null
2011-04-15 09:05:58.760:WARN::/socket.io/xhr-multipart/
java.lang.IllegalStateException: Committed
	at org.eclipse.jetty.server.Response.resetBuffer(Response.java:1052)
	at org.eclipse.jetty.server.Response.sendError(Response.java:270)
	at org.eclipse.jetty.server.Response.sendError(Response.java:372)
	at com.glines.socketio.server.transport.XHRTransport$XHRSessionHelper.handle(XHRTransport.java:137)
	at com.glines.socketio.server.transport.AbstractHttpTransport.handle(AbstractHttpTransport.java:90)
	at com.glines.socketio.server.SocketIOServlet.service(SocketIOServlet.java:123)
	at com.glines.socketio.server.SocketIOServlet.service(SocketIOServlet.java:91)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:527)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:423)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:493)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:225)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:930)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:358)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:866)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:113)
	at org.eclipse.jetty.server.Server.handleAsync(Server.java:390)
	at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:599)
	at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:408)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:506)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:436)
	at java.lang.Thread.run(Thread.java:636)
2011-04-15 09:05:58.760:DBUG::[GET /socket.io/xhr-multipart/]@5547667 org.eclipse.jetty.server.Request@54a693
2011-04-15 09:05:58.760:DBUG::Response already committed for handling java.lang.IllegalStateException: Committed
2011-04-15 09:05:58.760:DBUG::RESPONSE /socket.io/xhr-multipart/  200
2011-04-15 09:05:58.761:DBUG::EOF org.eclipse.jetty.io.EofException