title: Unable to find where my java installation is
body: <p>I have java installed. However, <code>JAVA_HOME</code> is empty and I can't find out where it should point to:</p>
  
  <pre><code>$ ls /usr/lib/jvm/default-java
  ls: cannot access '/usr/lib/jvm/default-java': No such file or directory
  
  $ ls /usr/bin/java
  /usr/bin/java
  </code></pre>