title: Profiling tomcat application with VisualVM
body: <p>I am trying to run visualvm under the username tomcat6 because apparently visualvm can only find applications running under its username. So by default it is only finding applications running under my username. I have been able to connect visualvm with tomcat6 through jmx but that lacks the fine granularity of instrumented profiling.</p>
  
  <p>I tried the following to run visualvm under the username tomcat6 but got the following error that I don't understand.</p>
  
  <pre><code>$ sudo -u tomcat6 jvisualvm
  No protocol specified
  Exception in thread "main" java.awt.AWTError: Can't connect to X11 window server using ':0' as the value of the DISPLAY variable.
      at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
      at sun.awt.X11GraphicsEnvironment.access$200(X11GraphicsEnvironment.java:65)
      at sun.awt.X11GraphicsEnvironment$1.run(X11GraphicsEnvironment.java:115)
  ...
  </code></pre>