title: Proguard Obfuscation failed in Jenkins build using Maven - can't read classes.jar
body: <p>I'm using Jenkins to build a Maven project on a Linux box and getting the following error:</p>
  <blockquote>
  <p>[proguard] Error: Can't read [/usr/lib/jvm/java-6-openjdk-amd64/Classes/classes.jar] (No such file or directory)</p>
  </blockquote>
  <p>I have installed JDK and set the JAVA_HOME variable to:  /usr/lib/jvm/java-6-openjdk-amd64</p>
  <p>However, if I take a look at the 'System Information' section of Jenkins I get two locations for java home:</p>
  <blockquote>
  <p>java.home: /usr/lib/jvm/java-6-openjdk-amd64/jre</p>
  <p>JAVA_HOME: /usr/lib/jvm/java-6-openjdk-amd64</p>
  </blockquote>
  <p>When I run the project on MacOS the proguard plugin works perfectly so I know it has nothing to do with my project setup.  Something I'm missing in Jenkins or how Java is installed on my Server?</p>