Five new built-in constraints: @AssertURL, @InstanceOfAny, @MemberOf, @NotEqual, and @NotMemberOf. errorCode and severity can now be specified for constraints. Support for object-level constraints (compound constraints). Support for Ruby as a constraints expression language. Constraints violation messages have been translated into Chinese, Dutch, Hungarian, Italian, Norwegian, Portuguese, Romanian, Russian, Spanish, Swedish, and Turkish. Support for different logging frameworks/facades, including JDK logging, Log4J, and commons logging so far.
URL: OVal - the object validation framework for Java™ 5 or later