Silent Swallowing of NoClassDefFoundError
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                 Key: LOGGING-114
                 URL: https://issues.apache.org/jira/browse/LOGGING-114
             Project: Commons Logging
          Issue Type: Bug
    Affects Versions: 1.1.0
         Environment: Various OSs, in combination with log4j 1.2.14.
            Reporter: Malcolm Cleaton
            Priority: Minor


Hi. I'm using commons logging with log4j; my team ship a library which uses 
log4j, and some of our clients use it with commons-logging.

If commons-logging is in its default configuration, and log4j is present but 
fails to load its configuration with an unhandled exception, the results are 
pretty nasty:

- commons-logging silently swallows the exception and logs with something else. 
If diagnostics are turned on, the message is:
    Could not instantiate Log 'org.apache.commons.logging.impl.Log4JLogger' -- 
java.lang.reflect.InvocationTargetException: null

- future attempts to use log4j directly get a pretty unhelpful error:
    java.lang.NoClassDefFoundError at 
org.apache.log4j.Logger.getLogger(Logger.java:117).

I realise you're trying to deal with a very large number of cases in this code, 
but it does seem like something better could be done here. If nothing else is 
possible, at least recognising the InvocationTargetException and pulling out 
the target exception for the diagnostic log would have helped with tracking 
this one down.

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