[logback-dev] Logback and Java requirement

Ceki Gulcu listid at qos.ch
Tue Nov 18 18:35:46 CET 2008

Thorbjørn Ravn Andersen wrote:
> Hi Ceki.
> I just migrated an elderly application using log4j and jcl to logback 
> except logback doesn't run under Java 1.4 (which is what I have on this 
> AS/400).  Bummer.  I wanted the markers to be able to filter on 
> threads.  Oh well.

Sorry to hear about the wasted effort. Did you use the slf4j-migrator?

> I could not locate anywhere on the logback pages that Java 5 is a hard 
> requirement (but it was mentioned way down in a slf4j page).  I'd 
> suggest you add a notice to the download page.

It's documented: http://logback.qos.ch/dependencies.html

> (And it appears that http://retrotranslator.sourceforge.net/ works with 
> logback under 1.4, but that
> stack traces look somewhat strange, I'll look into that later)

Earlier versions of logback offered retrotranslated jar. However, we did not 
want to bother with testing and maintaining that. (It is a thankless job).

If you wish, you can add it back by reversing the changes at:


The last time I checked the retrotranslated code worked pretty well. However, 
that was over 6 months ago.


Ceki Gülcü
Logback: The reliable, generic, fast and flexible logging framework for Java.

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