title: java.lang.NumberFormatException on Eclipse start
body: <p>When I start Eclipse, I sometimes get the following error:</p>
  
  <pre><code>!SESSION Wed Dec 16 09:31:26 EST 2015    ------------------------------------------
  !ENTRY org.eclipse.equinox.launcher 4 0 2015-12-16 09:31:26.409
  !MESSAGE Exception launching the Eclipse Platform:
  !STACK
  java.lang.NumberFormatException: null
          at java.lang.Long.parseLong(Long.java:404)
          at java.lang.Long.parseLong(Long.java:483)
          at org.eclipse.equinox.launcher.Main.getLastKnownConfigIniBaseTimestamp(Main.java:1966)
          at org.eclipse.equinox.launcher.Main.processConfiguration(Main.java:1905)
          at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
          at org.eclipse.equinox.launcher.Main.run(Main.java:1515)
  </code></pre>
  
  <p>A similar error with a different call stack and cause is described <a href="https://stackoverflow.com/q/26216142/25507">here</a>.</p>