Affects Version/s: None
Fix Version/s: None
Operating System: All
If an exception is thrown by a rule during the parse, Digester will log a
message containing the exception stack trace, even if debug==0. This is
undesirable for two reasons:
1. We might not want to log this, either because the application catches the
exception and cleanly handles it (in which case, there's really no 'need to
know'), or because the exception is part of the normal application flow (for
example, a rule might throw an exception in order to prematurely terminate the
2. By default, log() outputs to System.out. Applications that pipe output to
System.out probably do not want stack traces going there.
In my particular case, I have unit tests that intentionally send bad data
through the digester, to validate that various Rule classes detect the bad data
and throw the proper exceptions. It's distracting to see stack traces in the
unit test report, for tests that did not fail.
Pass a dummy logging writer to the Digester via setWriter(), that outputs
nothing if debug == 0.
1. Change Digester to log exceptions only if debug > 0. Or create a debug level
of -1 that logs nothing; this will fully preserve backward compatibility.
2. Change the default log output stream from System.out to System.err