added a work around for issue #610.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@5220 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/Hudson.java

@@ -332,7 +332,9 @@ public final class Hudson extends View implements ItemGroup<TopLevelItem>, Node
      * Gets the {@link JobPropertyDescriptor} by name. Primarily used for making them web-visible.
      */
     public JobPropertyDescriptor getJobProperty(String shortClassName) {
-        return (JobPropertyDescriptor)findDescriptor(shortClassName, Jobs.PROPERTIES);
+        // combining these two lines triggers javac bug. See issue #610.
+        Descriptor d = findDescriptor(shortClassName, Jobs.PROPERTIES);
+        return (JobPropertyDescriptor) d;
     }
 
     /**