# Registering an Existing Validation Rule Class

Use the Registering a Java Class as a Rule dialog box to specify the Java class that will be used as a validation rule. Select an existing class (it needs to be compiled and available in the classpath of the project), to be registered as a validation rule. Give a valid alias by which the project should address the selected class.

Field | Description
Class | The Java class to which the validation rule belongs. If you do not want to use the displayed class, click Browse to select the validator class from a tree of available packages in the classpath. Alternatively, a fully qualified class name can be entered in to the Class field. If the name is a valid validation rule class (it implements `JbiValidator interface`), then it's description is shown in the Description field. Click OK and the rule will be registered with the project via the Project Wizard.
Name | A default name is provided for the validation rule. You can accept the default or enter a different name.
Description | A text description of the validation rule.