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https://issues.apache.org/jira/browse/SOLR-3706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13594333#comment-13594333
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Shawn Heisey commented on SOLR-3706:
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bq. I think you need to remove all slf4j jars from the war for it to work. When
slf4j-api.jar is in the war you won't be able to load slf4j-log4j*.jar from
external location. Also I believe various servlet container implementations may
require you to put your logging classes in different places for it to work. For
wrapping up /example/ I believe it will work put them all in /example/lib. Try
it.
This is exactly right. I created a patch that made a "dist-excl-slf4j" build
target, and modified the dist-war-excl-slf4j target. Hoss committed it for me
in SOLR-3918, on the condition that I updated the wiki, which I did. Now all
slf4j jars are removed from the war.
I use the jetty included with the example in production, and log4j finally
worked when I put the slf4j and log4j jars in lib/ext.
> Ship setup to log with log4j.
> -----------------------------
>
> Key: SOLR-3706
> URL: https://issues.apache.org/jira/browse/SOLR-3706
> Project: Solr
> Issue Type: Improvement
> Reporter: Mark Miller
> Assignee: Mark Miller
> Priority: Minor
> Fix For: 5.0, 4.3
>
>
> Currently we default to java util logging and it's terrible in my opinion.
> *It's simple built in logger is a 2 line logger.
> *You have to jump through hoops to use your own custom formatter with jetty -
> either putting your class in the start.jar or other pain in the butt
> solutions.
> *It can't roll files by date out of the box.
> I'm sure there are more issues, but those are the ones annoying me now. We
> should switch to log4j - it's much nicer and it's easy to get a nice single
> line format and roll by date, etc.
> If someone wants to use JUL they still can - but at least users could start
> with something decent.
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