How do disable log4j plugin in grails?

Question

It appears the Grails 2.1 log4j plugin resets the log4j configuration during initialization of the grails application (see stack trace below).

    at org.apache.log4j.LogManager.resetConfiguration(LogManager.java:233)
    at org.apache.log4j.LogManager$resetConfiguration.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:112)
    at org.codehaus.groovy.grails.plugins.log4j.Log4jConfig.initialize(Log4jConfig.groovy:66)
    at org.codehaus.groovy.grails.plugins.log4j.web.util.Log4jConfigListener.contextInitialized(Log4jConfigListener.java:48)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3910)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4389)
    at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeployInternal(TomcatDeployment.java:313)
    at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeploy(TomcatDeployment.java:145)

Is there any way to disable this "feature" or to remove this plugin altogether?

My JBoss server is already configured through jboss-log4j.xml and I do not want grails to make any changes to the configuration. I have already tried removing the log4j section of Config.groovy, but doing so had no effect.

As Kelly suggested, I have already removed all logging-related jars from my war file. Log4j classes are provided by JBoss.

EDIT I also tried the trick described in https://stackoverflow.com/a/1190438/539048 but that didn't seem to make any difference.

Answer 1

The solution was to remove the following section from the generated web.xml file:

<listener>
    <listener-class>org.codehaus.groovy.grails.plugins.log4j.web.util.Log4jConfigListener</tag0:listener-class>
</listener>

To do so, I edited the scripts/Events.groovy file according to this blog but changed the listener class name to org.codehaus.groovy.grails.plugins.log4j.web.util.Log4jConfigListener.

eventWebXmlEnd = {String tmpfile ->

    def root = new XmlSlurper().parse(webXmlFile)

    def log4j = root.listener.findAll {node ->
        node.'listener-class'.text() == 'org.codehaus.groovy.grails.plugins.log4j.web.util.Log4jConfigListener'
    }
    log4j.replaceNode {}

    webXmlFile.text = new StreamingMarkupBuilder().bind {
        mkp.declareNamespace("": "http://java.sun.com/xml/ns/j2ee")
        mkp.yield(root)
    }
}

Answer 2

Modify your BuildConfig.groovy like this:

inherits("global") {
    excludes 'log4j', 'jcl-over-slf4j', 'slf4j-api', 'slf4j-log4j12'
}

This should remove all the logging libraries.