Gangadhara Melukote thinks this is interesting: validation-mode element in the persistence.xml file. This element may be set to one of three possible values. AUTO: Turn on validation when a validation provider is present on the classpath (default). CALLBACK: Turn on validation and throw an error if no validation provider is available. NONE: Turn off validation. javax.persistence.validation.mode persistence property. This property may be specified in the Map passed to the From CHAPTER 12: Other Advanced Topics from Pro JPA 2, Second Edition by Merrick Schincariol, Mike Keith Publisher: Apress Released: September 2013 Note Controlling validation at global level. Share this highlight http://www.safaribooksonline.com/a/pro-jpa-2/12713869/ Twitter Facebook Google Plus Email Get Instant Access Now Start a Free Trial Have an account? Sign in. Minimise Unlock the rest of Pro JPA 2, Second Edition and 30,000 other books and videos By clicking this box, you confirm that you have read and agree to the terms and conditions of our Membership Agreement, and you understand that when your trial period ends, you will be required to provide billing information if you wish to continue using the service. Unlock the rest of this book Start a Free 10-Day Trial loading Learn about Safari for Business Have an account? Sign in.