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When accessing static members of the target class, data is not as expected, leading us to believe that the extension loaders are segregated in some way.

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public class TestSingleton
{
	public static int A_NUMBER = 100;
	public static String A_STRING = "A String";
	
	private static TestSingleton _instance;
	public String text;
	
	private TestSingleton()
	{
		text = "Hello Singleton!";
	}
	
	public static TestSingleton getInstance()
	{
		if (_instance == null)
			_instance = new TestSingleton();
		
		return _instance;
	}

}

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public class ThirdClass {
   private static HashMap<String, ThirdClass> ZoneInstances = new HashMap<String, ThirdClass>(); // zonename->thirdclass instances (we intend to have one instance per zone)

   private DbManager dbMan;
   private Zone currZone;
   private Hashtable<Integer, Integer> testHashTable;

   public ThirdClass (Zone z) {
      currZone = z;
      dbMan = currZone.dbManager;
      testHashTable = new Hashtable<Integer,Integer>();
      for (Object u : z.getUserList()) {
    	  User user = (User)u;
    	  this.testHashTable.put(user.getUserId(), 0); // or some other test value
      }
   }

   public static ThirdClass instance(Zone zone) {

      String zoneName = zone.getName();
      ThirdClass tc;
      if (!ZoneInstances.keySet().contains(zoneName)) {
         tc = new ThirdClass(zone);
         ZoneInstances.put(zoneName, tc);
      } else {
         tc = ZoneInstances.get(zoneName);
      }
      return tc;
   }
}

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public class OurExtension2 extends AbstractExtension {

   private ExtensionHelper xtHelper;
   private Zone currZone;
   private ThirdClass thirdClass;

   public void init() {
      xtHelper = ExtensionHelper.instance();
      currZone = xtHelper.getZone(this.getOwnerZone());
      thirdClass = namespace.ThirdClass.instance(currZone);
   }