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From "Harry Metske (JIRA)" <>
Subject [jira] Commented: (JSPWIKI-376) Move from log4j to slf4j
Date Sat, 27 Sep 2008 19:03:44 GMT


Harry Metske commented on JSPWIKI-376:

I did some further investigation last week on this, the details can be found at
To summarize:
- WebSphere version 6.1 and up no longer has a problem with JSPWiki, it installs out of the
box (it appears that the common-logging-api.jar is no longer in WebSphere's lib directory,
which was the root cause of the classloading problems)
- I don't have a WebLogic at my disposal, so I don't know if the current version of this still
has the problem.
- If we switch to slf4j (which is not quite trivial), and we only ship the slf4j-simple.jar
by default, we have to realize that all non-core plugins should also be changed so they also
use slf4j.

After all I 'm not so sure if switching to slf4j is a good idea. My assumption is that the
vast majority runs on Tomcat, and only a few run on WebLogic.
Switching to slf4j might break more things than it tries to repair.

I have a slf4j-simple based build running om Tomcat now, it passes all tests, but still a
lot of things need to be adjusted (see link above).

How to continue? , opinions please....

> Move from log4j to slf4j
> ------------------------
>                 Key: JSPWIKI-376
>                 URL:
>             Project: JSPWiki
>          Issue Type: Improvement
>          Components: Core & storage
>            Reporter: Janne Jalkanen
>            Assignee: Harry Metske
>             Fix For: 3.0
> SLF4J allows far more flexible logging than log4j, and it would allow us to get rid of
these dumb log4j compatibility problems that sometimes occur.  It also plays better with other
applications, gives the user more power to choose how to log his stuff, and is also pretty
cool otherwise. The change would be relatively trivial, and would probably be largely invisible
to the users (since we could continue shipping with necessary log4j jars).
> The license is MIT/X11, so that's fine.
> Opinions?

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