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https://issues.apache.org/jira/browse/SOLR-549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Henri Biestro updated SOLR-549:
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Attachment: solr-log4j.patch
This patch allows to re-route jul logging to log4j if desired; this does not
try to change the logging API - ie, the jul logging remains the choice- but
gives the web application a chance to initialize logging a bit differently and
become log4j firendly.
It introduces a 'org.apache.solr.logging' package from which jul loggers are
obtained; instead of writing 'Logger log =
java.util.logging.Logger.getLogger("blah");' you write 'Logger log =
org.apache.solr.logging.Logger("blah");'. The default behavior is maintained
and so are the dependencies.
The implementation classes that depend on log4j (1.2.15) are 'optionally'
compiled so far by changing the build.xml 'compile-common' target dependency
from 'compile-logging' to 'compile-logging-log4j'. More precisely if the
'org.apache.solr.logging.Configuration' class can be loaded , the framework
will return anonymous j.u.l.Loggers having one handler that convert their
LogRecords into log4j events, the log4j logger having the name of the intended
j.u.l.Logger.
The code comments go through more details.
> Enable configurable logging (jul or log4j)
> ------------------------------------------
>
> Key: SOLR-549
> URL: https://issues.apache.org/jira/browse/SOLR-549
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 1.3
> Reporter: Henri Biestro
> Attachments: solr-log4j.patch
>
>
> java.util.logging does not allow to easily create a self-sufficient 'war'
> with respect to logging configuration.
> The java.util.logging.LogManager used by the application is always created by
> the container and is thus only configurable through the container;
> furthermore, if one already uses say log4j in a webapp that embeds Solr, it
> does not even seem possible to re-route jul logging into log4j just by
> configuration.
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