Do not add the 'war' plugin. Just use the War task itself

Author: ysb33r

src/main/groovy/com/lookout/jruby/JRubyPlugin.groovy

@@ -14,7 +14,6 @@ class JRubyPlugin implements Plugin<Project> {
 
     void apply(Project project) {
         project.apply plugin: 'java'
-        project.apply plugin: 'war'
         project.extensions.create('jruby', JRubyPluginExtension, project)
 
         if (!project.repositories.metaClass.respondsTo(project.repositories, 'rubygemsRelease')) {