Resolution:
This is caused by a mismatch of TIBCO Rendezvous versions installed on the machine and the tibrvj.jar file that IcWeb730.war uses.  You must replace the IcWeb tibrvj.jar with the more current version from your installation.  The new tibrvj.jar file will go in the directory C:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\icweb730\WEB-INF\lib.  Where C:\Program Files\Apache Software Foundation\Tomcat 5.5\ is the root of the websever.

Note the web server must be stopped and restarted for the file change to take effect.

Transport Creation Error
caused by: Tibrv not initialized

    at com.tibco.workflow.icjava.transport.TibrvWfTransport.(TibrvWfTransport.java:52)
    at com.tibco.workflow.icjava.transport.TibrvWfTransportFactory.a(TibrvWfTransportFactory.java:154)
    at com.tibco.workflow.icjava.transport.TibrvWfTransportFactory.getWfTransport(TibrvWfTransportFactory.java:128)
    at com.tibco.workflow.icjava.transport.WfTransportManager.getWfTransport(WfTransportManager.java:30)
    at com.tibco.workflow.icjava.remote.WfServerRemImpl.getServerNames(WfServerRemImpl.java:370)
    at com.tibco.workflow.icjava.WfServerImpl.getServerNames(WfServerImpl.java:250)
    at com.tibco.workflow.api.WfClient.getServerNames(WfClient.java:196)
    at org.apache.jsp.jsp.login_jsp._jspService(login_jsp.java:666)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:873)
    at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
    at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
    at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
    at java.lang.Thread.run(Unknown Source)
Caused by: TibrvException[error=4,message=Tibrv not initialized]
    at com.tibco.tibrv.Tibrv.checkValid(Tibrv.java:329)
    at com.tibco.tibrv.TibrvTransport.(TibrvTransport.java:28)
    at com.tibco.tibrv.TibrvNetTransport.(TibrvNetTransport.java:19)
    at com.tibco.tibrv.TibrvRvdTransport.(TibrvRvdTransport.java:49)
    at com.tibco.workflow.icjava.transport.TibrvWfTransport.(TibrvWfTransport.java:42)
    ... 27 more


The full stack is

IcWeb log in screen gives an error message of "Transport Creation Error caused by: Tibrv not initialized"