[logback-dev] [Bug 73] New: LOGBack 0.9.5 doesn't work with SLF4J 1.4.0

[bugzilla-daemon at pixie.qos.ch]

http://bugzilla.qos.ch/show_bug.cgi?id=73

           Summary: LOGBack 0.9.5 doesn't work with SLF4J 1.4.0
           Product: logback-core
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: blocker
          Priority: P1
         Component: Other
        AssignedTo: logback-dev at qos.ch
        ReportedBy: agerwe at acxiom.com


With the addition of the trace level in SLF4J 1.4.0, the constants for the log
level constants in org.slf4j.spi.LocationAwareLogger were changed from 0, 1, 2,
3 to 10, 20, 30, 40. 

Unfortuantely, constant values like integers are actually compiled into classes
and not read at runtime from the defining class: you need to upgrade all your
binaries if you change the values of constants. The case statement at line 745
in ch.qos.logback.classic.Logger no longer works unless manually recompiled
against the new Log4j. If you try to use LOGBack-classic 0.9.5 from iBiblio
with SLF4J 1.4.0 (which seems to be missing :-(), you will not be able to log
anything: every non-TRACE log attempt will fail with "n is not a valid integet"
[sic] where n is 10, 20, 30 or 40.

It would have been *much* wiser to simply set TRACE to -1 or even 4 rather than
changing the existing constants and creating a big headache and forced binary
upgrades that are very difficult to debug.


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