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https://issues.apache.org/jira/browse/JSPWIKI-795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17379172#comment-17379172
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Juan Pablo Santos RodrÃguez commented on JSPWIKI-795:
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As of 2.11.0-git-06,
* Log4J2 is the new logging framework used by JSPWiki. Although all Log4J (and
SLF4J) calls are transparently routed to Log4J2, the log configuration inside
{{jspwiki.properties}} has changed, so installations with customized logging
configuration will need to be set up again.
* Existing 3rd party plugins, filters and providers will continue to work as
expected, as Log4J calls will be routed to Log4J2, but the use of Log4J2 should
be preferred onwards.
* By default, JSPWiki will configure Log4J2 from the
{{jspwiki[-custom].properties}} files, expecting log configuration to be there
using [Log4J2 properties
syntax|https://logging.apache.org/log4j/2.x/manual/configuration.html#Properties]
* {{jspwiki.use.external.logconfig=true}} can still be used on
{{jspwiki[-custom].properties}} files to bypass JSPWiki log re-configuration
and rely directly on Log4J2 configuration mechanisms
* Note that Log4J calls are still used throughout JSPWiki; they'll be replaced
by equivalent Log4J2 calls later on, but this will be an implementation detail
that should be transparent to end users.
* *IMPORTANT*: if you're using a [JSPWiki customized
.war|https://jspwiki-wiki.apache.org/Wiki.jsp?page=StartingPointForCustomExtensions#section-StartingPointForCustomExtensions-BuildingACustomized.warFileWithYourExtensions],
please ensure that neither Log4J nor any SLF4J implementation end up in your
customized {{.war}}.
> Update logging subsystem in JSPWiki
> -----------------------------------
>
> Key: JSPWIKI-795
> URL: https://issues.apache.org/jira/browse/JSPWIKI-795
> Project: JSPWiki
> Issue Type: Improvement
> Reporter: Glen Mazza
> Priority: Major
>
> Juan Pablo recommended a switch to SLF4J + [Logback | Log4j2].
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