The build of Saxon has been installed and the application has been running for 3 days without running into this "ArrayIndexOutOfBoundsException" exception.  I'll let you know if it happens and what the debugging output looks like.  Typically, by now the problem has occurred.  I'm wondering if the JVM does some optimization of the loop which iterates through the hash and if putting this try/catch in this code possibly caused the JVM to not do the optimization - but really this is just a very weak hypothesis on my part.  Just because it hasn't happened yet doesn't mean it wont.  Time will tell.
I'll keep you updated.
Thanks for all your help thus far.
Paul Ackley