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https://issues.apache.org/jira/browse/LOG4J2-97?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13475471#comment-13475471
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Ralph Goers commented on LOG4J2-97:
-----------------------------------
The workaround for the above problem consists of choosing from one of the
following 3 options:
1.
http://velocity.apache.org/engine/releases/velocity-1.7/developer-guide.html#usinglog4jwithexistinglogger
documents how to use an existing Log4j Logger. If this is done Velocity won't
create an Appender and all is well.
2.
http://velocity.apache.org/engine/releases/velocity-1.7/developer-guide.html#simpleexampleofacustomlogger
shows how to use a custom Logger. By calling
"Velocity.setProperty(Velocity.RUNTIME_LOG_LOGSYSTEM, new
org.apache.velocity.slf4j.Slf4jLogChute())" before calling Velocity.init()
Velocity will use SLF4J.
3. The same as item 2 but implement a LogChute for Log4j 2.x.
> The Log4j 1.x compatibility bridge does not implement enough of Log4j
> ---------------------------------------------------------------------
>
> Key: LOG4J2-97
> URL: https://issues.apache.org/jira/browse/LOG4J2-97
> Project: Log4j 2
> Issue Type: Bug
> Components: log4j 1.2 emulation
> Affects Versions: 2.0-beta2
> Reporter: Ralph Goers
>
> When running an application the following stack trace was encountered.
> catching java.lang.NoSuchMethodError:
> org.apache.log4j.Logger.addAppender(Lorg/apache/log4j/Appender;)V
> at
> org.apache.velocity.runtime.log.Log4JLogChute.initAppender(Log4JLogChute.java:127)
> ~[velocity-1.7.jar:1.7]
> at org.apache.velocity.runtime.log.Log4JLogChute.init(Log4JLogChute.java:85)
> ~[velocity-1.7.jar:1.7]
> at
> org.apache.velocity.runtime.log.LogManager.createLogChute(LogManager.java:157)
> ~[velocity-1.7.jar:1.7]
> at org.apache.velocity.runtime.log.LogManager.updateLog(LogManager.java:269)
> ~[velocity-1.7.jar:1.7]
> at
> org.apache.velocity.runtime.RuntimeInstance.initializeLog(RuntimeInstance.java:871)
> ~[velocity-1.7.jar:1.7]
> at org.apache.velocity.runtime.RuntimeInstance.init(RuntimeInstance.java:262)
> ~[velocity-1.7.jar:1.7]
> at
> org.apache.velocity.runtime.RuntimeSingleton.init(RuntimeSingleton.java:112)
> ~[velocity-1.7.jar:1.7]
> at org.apache.velocity.app.Velocity.init(Velocity.java:74)
> ~[velocity-1.7.jar:1.7]
> To be useful the compatibility bridge must provide some sort of support for
> these kinds of usages.
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