1. Create a new Java EE Webapp project using the wizard in JBDS Central. 2. Create a new JPA entity using the "JPA: New Entity" command. 3. Create a new field using the "JPA: New Field" command. 4. Select the project in the project navigator. This ensures that the current class is not selected and available within the Forge execution context. 4. Launch the "Constraint: Add" command. Change the class from the existing "Resources" class to the newly created class in the above step. Hit Next. The list of properties displays "em" instead of properties in the selected class. "em" seems to be a property in the Resources class, which happens to be the initial class during my test run.