[hibernate-issues] [Hibernate-JIRA] Resolved: (HV-286) NoSuchMethodError on Persistence.getPersistenceUtil() when one follows the README file

NoSuchMethodError on Persistence.getPersistenceUtil() when one follows the README file -------------------------------------------------------------------------------------- Key: HV-286 URL: http://opensource.atlassian.com/projects/hibernate/browse/HV-286 Project: Hibernate Validator Issue Type: Patch Components: documentation Affects Versions: 4.0.2.GA Environment: Hibernate Validator 4.0.2 GA Hibernate Core 3.5.0-Beta 2 (+ Annotations, no EntityManager) WebLogic 10MP1 (EE5/JPA1) JDK5 Reporter: Mathias De Belder Assignee: Hardy Ferentschik Priority: Trivial Fix For: 4.1.0 Attachments: readme.patch The readme.txt file tells one to add all the libraries from the lib/ subdirectory of the distribution package on the classpath: "- Copy hibernate-validator-*.jar together will all jar files from lib into the classpath of your application. In case you are running on JDK5 you have to also include all the jar files from the jdk5 subdirectory." The lib/ directory in 4.0.2GA contains jpa-api-2.0.Beta-20090815.jar, the public JPA2 API. Included in that jar file is javax/persistence/PersistenceUtil.class. org.hibernate.validator.engine.resolver.DefaultTraversableResolver is the default TraversableResolver one gets when one calls Validation.buildDefaultValidationFactory(). In its constructor, DefaultTraversableResolver calls detectJPA(), which looks for the PersistenceUtil class on the classpath. When this is found (in jpa-api-2.0.jar), the two methods in the TraversableResolver interface are delegated to JPATraversableResolver, which triggers an exception because it calls Persistence.getPersistenceUtil(), which is not implemented by JPA1 providers (in this case, WebLogic 10). See also http://java.sun.com/javaee/6/docs/api/javax/persistence/Persistence.html#.... The workaround is easy: don't have a javax.persistence.PersistenceUtil class file on your classpath when you do not have a JPA2 provider on there too. The attached patch adds a note in the README telling users not to add the jpa2-api jar if they do not intend to use Hibernate Validation 4 with an JPA2 EntityManager but instead with Hibernate Core or JPA1, or maybe even without an ORM framework.