Program: 39
Project: 39
Buggy source:
public void editProperty(final String fullname,final String className,final String propname,final JavaScriptObject callback){
  if (!app.isTranslatorLoaded()) {
    app.checkTranslator(new XWikiAsyncCallback(app){
      public void onFailure(      Throwable caught){
        super.onFailure(caught);
        editProperty(fullname,className,propname,callback);
      }
      public void onSuccess(      Object result){
        super.onSuccess(result);
        editProperty(fullname,className,propname,callback);
      }
    }
);
    return;
  }
  XWikiService.App.getInstance().getDocument(fullname,true,true,true,false,new XWikiAsyncCallback(app){
    public void onFailure(    Throwable caught){
      Window.alert(app.getTranslation("String_Node_Str"));
      super.onFailure(caught);
    }
    public void onSuccess(    Object result){
      super.onSuccess(result);
      Document doc=(Document)result;
      XObject obj=doc.getObject(className);
      if (obj == null)       Window.alert(app.getTranslation("String_Node_Str"));
 else {
        final String fieldname=obj.getClassName() + "String_Node_Str" + obj.getNumber()+ "String_Node_Str"+ propname;
        final String formname="String_Node_Str";
        String field=obj.getEditProperty(propname);
        String form="String_Node_Str" + formname + "String_Node_Str"+ formname+ "String_Node_Str"+ field+ "String_Node_Str";
        EditPropDialog dialog=new EditPropDialog(app,"String_Node_Str",form,formname,fieldname,Dialog.BUTTON_CANCEL | Dialog.BUTTON_NEXT);
        dialog.setTitle(app.getTranslation("String_Node_Str"));
        dialog.setMessage("String_Node_Str",null);
        dialog.setNextCallback(new AsyncCallback(){
          public void onFailure(          Throwable throwable){
          }
          public void onSuccess(          Object object){
            final String value=(String)object;
            if ((value != null) && (value != "String_Node_Str")) {
              XWikiService.App.getInstance().updateProperty(fullname,className,propname,value,new XWikiAsyncCallback(app){
                public void onFailure(                Throwable caught){
                  super.onFailure(caught);
                  Window.alert(app.getTranslation("String_Node_Str"));
                }
                public void onSuccess(                Object result){
                  super.onSuccess(result);
                  XWikiService.App.getInstance().getDocument(fullname,true,true,false,false,new XWikiAsyncCallback(app){
                    public void onFailure(                    Throwable caught){
                      Window.alert(app.getTranslation("String_Node_Str"));
                      super.onFailure(caught);
                      jscallback(callback,value);
                    }
                    public void onSuccess(                    Object result){
                      super.onSuccess(result);
                      String newValue=value;
                      Document doc=(Document)result;
                      XObject obj=doc.getObject(className);
                      if (obj != null)                       newValue=obj.getViewProperty(propname);
                      jscallback(callback,newValue);
                    }
                  }
);
                }
              }
);
            }
 else {
              Window.alert(app.getTranslation("String_Node_Str"));
            }
          }
        }
);
        dialog.show();
      }
    }
  }
);
}

Fixed version (ground truth):
public void editProperty(final String fullname,final String className,final String propname,final JavaScriptObject callback){
  if (!app.isTranslatorLoaded()) {
    app.checkTranslator(new XWikiAsyncCallback(app){
      @Override public void onFailure(      Throwable caught){
        super.onFailure(caught);
        editProperty(fullname,className,propname,callback);
      }
      @Override public void onSuccess(      Object result){
        super.onSuccess(result);
        editProperty(fullname,className,propname,callback);
      }
    }
);
    return;
  }
  XWikiService.App.getInstance().getDocument(fullname,true,true,true,false,new XWikiAsyncCallback(app){
    @Override public void onFailure(    Throwable caught){
      Window.alert(app.getTranslation("String_Node_Str"));
      super.onFailure(caught);
    }
    @Override public void onSuccess(    Object result){
      super.onSuccess(result);
      Document doc=(Document)result;
      XObject obj=doc.getObject(className);
      if (obj == null)       Window.alert(app.getTranslation("String_Node_Str"));
 else {
        final String fieldname=obj.getClassName() + "String_Node_Str" + obj.getNumber()+ "String_Node_Str"+ propname;
        final String formname="String_Node_Str";
        String field=obj.getEditProperty(propname);
        String form="String_Node_Str" + formname + "String_Node_Str"+ formname+ "String_Node_Str"+ field+ "String_Node_Str";
        EditPropDialog dialog=new EditPropDialog(app,"String_Node_Str",form,formname,fieldname,Dialog.BUTTON_CANCEL | Dialog.BUTTON_NEXT);
        dialog.setTitle(app.getTranslation("String_Node_Str"));
        dialog.setMessage("String_Node_Str",null);
        dialog.setNextCallback(new AsyncCallback(){
          @Override public void onFailure(          Throwable throwable){
          }
          @Override public void onSuccess(          Object object){
            final String value=(String)object;
            if ((value != null) && (value != "String_Node_Str")) {
              XWikiService.App.getInstance().updateProperty(fullname,className,propname,value,new XWikiAsyncCallback(app){
                @Override public void onFailure(                Throwable caught){
                  super.onFailure(caught);
                  Window.alert(app.getTranslation("String_Node_Str"));
                }
                @Override public void onSuccess(                Object result){
                  super.onSuccess(result);
                  XWikiService.App.getInstance().getDocument(fullname,true,true,false,false,new XWikiAsyncCallback(app){
                    @Override public void onFailure(                    Throwable caught){
                      Window.alert(app.getTranslation("String_Node_Str"));
                      super.onFailure(caught);
                      jscallback(callback,value);
                    }
                    @Override public void onSuccess(                    Object result){
                      super.onSuccess(result);
                      String newValue=value;
                      Document doc=(Document)result;
                      XObject obj=doc.getObject(className);
                      if (obj != null)                       newValue=obj.getViewProperty(propname);
                      jscallback(callback,newValue);
                    }
                  }
);
                }
              }
);
            }
 else {
              Window.alert(app.getTranslation("String_Node_Str"));
            }
          }
        }
);
        dialog.show();
      }
    }
  }
);
}