title: Where is the Java SDK folder in my computer? Ubuntu 12.04
body: <p>I know it's installed because when I type:</p>
  
  <pre><code>$java -version
  </code></pre>
  
  <p>I get:</p>
  
  <pre><code>OpenJDK Runtime Environment (IcedTea6 1.12.5) (6b27-1.12.5-0ubuntu0.12.04.1)
  OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)
  </code></pre>
  
  <p>And when I type:</p>
  
  <pre><code>$locate jdk
  </code></pre>
  
  <p>I get:</p>
  
  <pre><code>/home/arturo/Documents/2012a/sys/java/jre/glnxa64/jre/lib/servicetag/jdk_header.png
  /usr/share/app-install/desktop/openjdk-6-jre:openjdk-6-java.desktop
  /usr/share/app-install/desktop/openjdk-7-jre:openjdk-7-java.desktop
  /usr/share/app-install/icons/openjdk-6.png
  /usr/share/app-install/icons/openjdk-7.png
  </code></pre>
  
  <p>What worries me about the first item in the list is that the 2012a folder is my MATLAB folder and not a standard 'usr/lib' folder. I'm really confused on where the JDK and JRE got installed, because I need to set the $JAVA_HOME path pointing to the folder. Where am I missing something?</p>