WLInitialContextFactory loses its ability to instantiate.

We have a realtime system built using WebLogic JMSC client software.  It runs for hours doing transaction processing without failure.

However, when we run robustness tests that involve shutting the server down, it follows this error path:

1. Errors like "[JMSClientExceptions:055088]The consumer is closed" and "weblogic.messaging.dispatcher.DispatcherException: weblogic.messaging.dispatcher.DispatcherException: java.lang.Exception: Producer not found"

2. At this point, we attempt to tear down the old JmsConnection object and create a new one.  In most other error scenarios, this works to re-establish a connection to the server if it's up.

3. Whenever we call into the JMSC interface, we get this error: "Cannot instantiate class: weblogic.jndi.WLInitialContextFactory"