Websphere Log4j2类路径问题

Question

I'm deploying an utility jar in websphere that publishes couple of APIs. Now these API would be called by a webapplication. Now this jar uses log4j2 for logging. I have tried to create an uber jar by adding the packages from the two log4j2 jars ( log4j-api-2.0.2.jar && log4j-core-2.0.2.jar). I'm doing this by using ant to build the utility jar.

Here is the snippet of the ant code that builds up the jar for me

<!--Creates the client jar file  -->
<target name="clientjar" depends="compile">


    <jar destfile="${dist.dir}/client/myUtility.jar" basedir="${class.dir}">    

        <zipgroupfileset dir="${lib.dir}" includes="*.jar" />

        <manifest>
            <attribute name="Built-By" value="${user.name}" />
            <attribute name="Build-Date" value="${timestamp}" />
            <section name="${ant.project.name}">
                <attribute name="Implementation-Title" value="${project.implementation.title}"/>
                <attribute name="Specification-Version" value="${project.version}"/>
            </section>
        </manifest>

    </jar>
</target>

My issue is when the web application that is sitting on the same jvm invokes the jar api, log4j spits out the following error message

ERROR StatusLogger Log4j2 could not find a logging implementation. Please add log4j-core to the classpath. Using SimpleLogger to log to the console...

Any pointers would be helpful.

Answer 1

If you unzip the log4j-core jar and re-zip it as part of a bigger jar file, make VERY sure to include ALL files that were originally in the log4j-core jar. It contains a number of config files that the log4j-api will look for. If these files are absent you will get the error you ran into.