title: How to set vmarg on ant build?
body: <p>When I try to run jdoexamples in appengine sdk I get an error. There is a workaround(-Dappengine.user.timezone.impl=UTC), which works when I set it on eclipse. But how could I do the same when I build it with ant?
  Here is the error output from ant build:</p>
  
  <pre><code>runserver:
   [java] java.lang.RuntimeException: Unable to restore the previous TimeZone
   [java]     at com.google.appengine.tools.development.DevAppServerImpl.restoreLocalTimeZone(DevAppServerImpl.java:228)
   [java]     at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:164)
   [java]     at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:164)
   [java]     at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)
   [java]     at com.google.appengine.tools.development.DevAppServerMain.&lt;init&gt;(DevAppServerMain.java:113)
   [java]     at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89)
   [java] Caused by: java.lang.NoSuchFieldException: defaultZoneTL
   [java]     at java.lang.Class.getDeclaredField(Class.java:1882)
   [java]     at com.google.appengine.tools.development.DevAppServerImpl.restoreLocalTimeZone(DevAppServerImpl.java:222)
   [java]     ... 5 more
  </code></pre>
  
  <p>BUILD SUCCESSFUL
  Total time: 4 seconds</p>