run netx without requiring X

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@12448 71c3de6d-444a-0410-be80-ed276b4c234a

test/src/test/java/hudson/slaves/JNLPLauncherTest.java

@@ -43,7 +43,7 @@ public class JNLPLauncherTest extends HudsonTestCase {
         ArgumentListBuilder args = new ArgumentListBuilder();
         args.add("java","-jar");
         args.add(Which.jarFile(netx.jnlp.runtime.JNLPRuntime.class).getAbsolutePath());
-        args.add("-nosecurity","-jnlp", getJnlpLink(c));
+        args.add("-headless","-nosecurity","-jnlp", getJnlpLink(c));
         return args;
     }