OVal is a generic validation framework for any kind of Java objects (not only JavaBeans) and allows you:

*

  to specify constraints for class fields and method return values
*

  to easily validate objects on demand
*

  to specify constraints for constructor parameters that are automatically checked when the constructor is called
*

  to specify constraints for method parameters that are automatically checked when the method is called
*

  to enforce full object validation after an object instance has been created
*

  to enforce full object validation before a method of the object is called
*

  to enforce full object validation after a method of the object is called

  to either let OVal throw constraint violation exceptions during automatic checks or alternatively notify constraint violation listeners.
*

  to easily create custom constraints