Description of problem:

- in case jboss-as service was restarted, and client was not closed, one fails to connect to web-admin, get a blank ovirt-page, and the following exception on server.log. 
closing the browser doesn't help. 

2012-01-23 07:46:43,776 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/webadmin]] (http--0.0.0.0-8080-3) Exception while dispatching incoming RPC call: com.google.gwt.user.client.rpc.SerializationException: Could not find ClientOracle data for permutation D89235EA1650E1EBD846C1C04AEE8A3E
        at com.google.gwt.rpc.server.RpcServlet.findClientOracleData(RpcServlet.java:279) [gwt-servlet-2.3.0.jar:]
        at com.google.gwt.rpc.server.RpcServlet.getClientOracle(RpcServlet.java:115) [gwt-servlet-2.3.0.jar:]
        at com.google.gwt.rpc.server.RpcServlet.processPost(RpcServlet.java:194) [gwt-servlet-2.3.0.jar:]
        at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62) [gwt-servlet-2.3.0.jar:]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:754) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.3.Final.jar:]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.3.Final.jar:]
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.3.Final.jar:]
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.3.Final.jar:]
        at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:151) [jboss-as-web-7.1.0.Beta1b.jar:]
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) [jbossweb-7.0.3.Final.jar:]
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.3.Final.jar:]
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.3.Final.jar:]
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [jbossweb-7.0.3.Final.jar:]
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.3.Final.jar:]
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) [jbossweb-7.0.3.Final.jar:]
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(J
Version-Release number of selected component (if applicable):