test plugin has some problem

[Pak, Young-rok]

plugin.jelly in test plugin:

         <j:if 
test="${!context.getVariable('maven.junit.fork').toString().trim().equalsIgnoreCase('no')}">
            <pathelement path="${plugin.getDependencyPath('xml-apis')}"/>
            <pathelement path="${plugin.getDependencyPath('xerces')}"/>
          </j:if>

this snippet has some problem. to avoid using xerces, setting 
maven.junit.fork=yes doesn't help. is there another way to avoid using xerces?