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From "Shawn Heisey (JIRA)" <>
Subject [jira] [Commented] (SOLR-4129) Solr UI doesn't support log4j
Date Fri, 30 Nov 2012 19:47:58 GMT


Shawn Heisey commented on SOLR-4129:

bq. Using WARN for an informational message just seems wrong to me, albeit I've seen it in
some projects at work. Simply setting only one class to INFO and others higher (e.g. WARN)
wouldn't work because this would probably go in SolrCore which has plenty of other INFO messages
to say. Too much IMO. I think the right solution is to log an announcement message to a special
name like "org.apache.solr.announcement". Yeah, file an issue for that.

You're right, such logs aren't warnings.  I'll file the new issue.

bq.  I believe there's even an ant target to pre-package the .war file appropriately.

There's a dist-war-excl-slf4j target, but there's no easy way to get both the special war
AND the rest of what 'dist' does.  I filed SOLR-3918 initially to just add a dist-excl-slf4j
target, then updated that issue to also remove slf4j-api-1.6.4.jar.  I'll be updating that
issue with my full rationale for why I think it should be committed.

> Solr UI doesn't support log4j 
> ------------------------------
>                 Key: SOLR-4129
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrCloud
>    Affects Versions: 4.0-ALPHA, 4.0-BETA, 4.0
>            Reporter: Raintung Li
>              Labels: log
>             Fix For: 4.1, 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., 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

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