Looks like my ShutdownException change is causing sealing violations

[Bryan Pendleton]

I'll have to study this:

    [junit] Exception in thread "Thread-117" java.lang.SecurityException: 
sealing violation: package org.apache.derby.shared.common.error is sealed
    [junit]     at 
java.net.URLClassLoader.getAndVerifyPackage(URLClassLoader.java:394)

bryan