Book.java

@Entity
public class Book implements Serializable {

	@Column
	@NotNull
	@Size(min=5, max=20)
	private String title;

	…

}

ExpressionLanguageDependency.xml

<dependency>
  <groupId>javax.el</groupId>
  <artifactId>javax.el-api</artifactId>
  <version>2.2.4</version>
</dependency>
<dependency>
  <groupId>org.glassfish.web</groupId>
  <artifactId>javax.el</artifactId>
  <version>2.2.4</version>
</dependency>

FailedPersist.log

18:21:33,229 ERROR ExceptionMapperStandardImpl:39 – HHH000346: Error during managed flush [Validation failed for classes [org.thoughts.on.java.model.Book] during persist time for groups [javax.validation.groups.Default, ]
List of constraint violations:[ConstraintViolationImpl{interpolatedMessage=’may not be null’, propertyPath=title, rootBeanClass=class org.thoughts.on.java.model.Book, messageTemplate='{javax.validation.constraints.NotNull.message}’}]]
18:21:33,233 INFO TestAttributeValidation:50 – ConstraintViolationImpl{interpolatedMessage=’may not be null’, propertyPath=title, rootBeanClass=class org.thoughts.on.java.model.Book, messageTemplate='{javax.validation.constraints.NotNull.message}’}

FailedUpdate.log

18:59:40,241 ERROR ExceptionMapperStandardImpl:39 – HHH000346: Error during managed flush [Validation failed for classes [org.thoughts.on.java.model.Book] during update time for groups [javax.validation.groups.Default, ]
List of constraint violations:[ConstraintViolationImpl{interpolatedMessage=’size must be between 5 and 20′, propertyPath=title, rootBeanClass=class org.thoughts.on.java.model.Book, messageTemplate='{javax.validation.constraints.Size.message}’}]]

HibernateValidatorDependency.xml

<dependency>
  <groupId>org.hibernate</groupId>
  <artifactId>hibernate-validator</artifactId>
  <version>5.3.4.Final</version>
</dependency>

PersistInvalidEntity.java

EntityManager em = emf.createEntityManager();
em.getTransaction().begin();

Book b = new Book();
em.persist(b);
try {
	em.getTransaction().commit();
	Assert.fail(“ConstraintViolationException exptected”);
} catch (RollbackException e) {
	Set<ConstraintViolation<?>> violations = ((ConstraintViolationException)e.getCause()).getConstraintViolations();
	for (ConstraintViolation v : violations) {
		log.info(v);
	}
}

em.close();

UpdateInvalidEntity.java

EntityManager em = emf.createEntityManager();
em.getTransaction().begin();

Book b = em.find(Book.class, 1000L);
b.setTitle(“This is a very long title with more than 20 characters.”);
try {
	em.getTransaction().commit();
	Assert.fail(“ConstraintViolationException exptected”);
} catch (RollbackException e) {
	log.error(e);
}

em.close();