| When defining the persistence.xml and using the new persistence_2_2.xsd schema with version=2.2, the persistence units inside are not found by hibernate when creating the EntityManagerFactory. The issue seems to be that hibernate is not using the latest schema to validate the persistence.xml, as demonstrated by the following sample and stack trace:
<?xml version="1.0" encoding="UTF-8" ?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_2.xsd"
version="2.2">
<persistence-unit name="example" transaction-type="RESOURCE_LOCAL">
<non-jta-data-source>jdbc/ExampleDS</non-jta-data-source>
<class>com.example.test.Project</class>
</persistence-unit>
</persistence>
Sample code:
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
public class TestApp {
public static void main(String args[]) {
EntityManagerFactory emf = Persistence.createEntityManagerFactory("example");
}
}
When running the following example I get the following error:
Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named example
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:85)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
at com.example.test.TestApp.main(TestApp.java:10)
2018-03-11 20:15:34,010 DEBUG -- org.hibernate.jpa.HibernatePersistenceProvider -- Unable to create EntityManagerFactory {} javax.persistence.PersistenceException: Unable to locate persistence units
at org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilderOrNull(HibernatePersistenceProvider.java:93)
at org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilderOrNull(HibernatePersistenceProvider.java:69)
at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:52)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
at com.example.test.TestApp.main(TestApp.java:10)
Caused by: javax.persistence.PersistenceException: Unrecognized persistence.xml version [2.2]
at org.hibernate.jpa.boot.internal.PersistenceXmlParser.validate(PersistenceXmlParser.java:491)
at org.hibernate.jpa.boot.internal.PersistenceXmlParser.loadUrl(PersistenceXmlParser.java:445)
at org.hibernate.jpa.boot.internal.PersistenceXmlParser.parsePersistenceXml(PersistenceXmlParser.java:247)
at org.hibernate.jpa.boot.internal.PersistenceXmlParser.parsePersistenceXml(PersistenceXmlParser.java:240)
at org.hibernate.jpa.boot.internal.PersistenceXmlParser.doResolve(PersistenceXmlParser.java:234)
at org.hibernate.jpa.boot.internal.PersistenceXmlParser.locatePersistenceUnits(PersistenceXmlParser.java:71)
at org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilderOrNull(HibernatePersistenceProvider.java:89)
... 5 more
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