title: "Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar" when starting the Scala interpreter
body: <p>When running the Scala interpreter in Ubuntu 14.04, I get the following message printed as the first line:</p>
  
  <pre><code>Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar 
  </code></pre>
  
  <p>Followed by the familiar "Welcome to Scala" message.</p>
  
  <p>I'm worried because I haven't seen that when running Scala before - what does it mean, is it dangerous, etc?</p>
  
  <p>Apparently the environment variable <code>$JAVA_TOOL_OPTIONS</code> is set to <code>-javaagent:/usr/share/java/jayatanaag.jar</code> - I didn't set that, but what did and why? Can I safely unset it?</p>
  
  <p>Additional info:</p>
  
  <ul>
  <li>recently installed Android Studio</li>
  <li>The word "ayatana" in the JAR's name might point to Ubuntu's project <a href="https://wiki.ubuntu.com/Ayatana" rel="noreferrer">Ayatana</a></li>
  </ul>