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

[Mathias De Belder (JIRA)]

NoSuchMethodError on Persistence.getPersistenceUtil() when one follows the README file
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                 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
         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#getPersistenceUtil%28%29.

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.

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