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Date: Tue, 5 Mar 2013 22:40:15 +0000 (UTC)
From: "Mark Miller (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Message-ID: <JIRA.12618294.1354267963709.387135.1362523215332@arcas>
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References: <JIRA.12618294.1354267963709@arcas>
Subject: [jira] [Commented] (SOLR-4129) Solr UI doesn't support log4j
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    [ https://issues.apache.org/jira/browse/SOLR-4129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13594038#comment-13594038 ] 

Mark Miller commented on SOLR-4129:
-----------------------------------

log4j-over-slf.jar has been removed - I think starting at 4.1.
                
> Solr UI doesn't support log4j 
> ------------------------------
>
>                 Key: SOLR-4129
>                 URL: https://issues.apache.org/jira/browse/SOLR-4129
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrCloud
>    Affects Versions: 4.0-ALPHA, 4.0-BETA, 4.0
>            Reporter: Raintung Li
>              Labels: log
>             Fix For: 4.2, 5.0
>
>         Attachments: patch-4129.txt
>
>
> For many project use the log4j, actually solr use slf logger framework, slf can easy to integrate with log4j by design. 
> Solr use log4j-over-slf.jar to handle log4j case.
> This jar has some issues.
> a. Actually last invoke slf to print the logger (For solr it is JDK14.logging).
> b. Not implement all log4j function. ex. Logger.setLevel() 
> c. JDK14 log miss some function, ex. thread.info, day rolling 
> Some dependence project had been used log4j that the customer still want to use it. JDK14 log has many different with Log4j, at least configuration file can't reuse.
> The bad thing is log4j-over-slf.jar conflict with log4j. If use solr, the other project have to remove log4j.
> I think it shouldn't use log4j-over-slf.jar, still reuse log4j if customer want to use it.

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