[logging][PROPOSAL] a solution to incompatibility between log4j versions

[robert burrell donkin]

the gump build of log4j has been failing over the last few days. this 
has (in turn) lead to a large number of downstream build failures. this 
has alerted us to the fact that we're fast approaching the time where 
we will have to deal with supporting three binary incompatible major 
versions of Log4J.

i think that the time has come to adopt a more systematic approach to 
this problem.

i propose that Log4jLogger continues to support the CVS HEAD version of 
log4j but that we create Log4J12Logger and Log4J11Logger 
implementations supporting the two major Log4J versions out there. when 
log4j 3.0 alpha/beta/release candidate comes out, we add a 
Log4J13Logger to support the 1.3 series of binary compatible releases.

the LogFactoryImpl would then use reflection to make a best guess about 
the version of log4j present when checking for log4j and also when 
creating a Log4jLogger instance (a cheat to help backward 
compatibility).

i've take a look into the implementation details and i think that this 
plan could be done pretty quickly and easily. if no one else raises any 
objections, i'll complete and commit the implementation tomorrow.

i'm very open to suggestions about the best way to structure the build 
scripts.

- robert
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