Liberty class loading issues or problem with hibernate (migrating tomcat app on liberty)? - jpa

Question

i have to deploy a multi-module application in ear on Liberty Server 20 in my Eclipse. This application use hibernate as provider jpa2 and Derby client + driver derby-10.12.1.1.jar(as shared fileset). Persistence.xml is configured with non jta.
This is server.xml:
<enterpriseApplication id="rubrica-ear" location="rubrica-ear.ear" name="rubrica-ear"/>
<dataSource jndiName="jdbc/TestappDS" type="javax.sql.ConnectionPoolDataSource">
<properties.derby.client createDatabase="false" databaseName=".rubrica"></properties.derby.client>
<jdbcDriver>
<library>
<fileset dir="C:\programmiMio\java-eclipse\drivers" id="shared"></fileset>
</library>
</jdbcDriver>
</dataSource>
My .rubrica db location is in /usr/home.
Because I dont want to start a server derby on console but automatically, i do taht in a #WebListener class:
#WebListener
public class ReqListener implements ServletContextListener {
static final Logger log = LoggerFactory.getLogger(ReqListener.class);
PrintWriter pw = new PrintWriter(System.out);
private NetworkServerControl derbyserver;
#Override
public void contextInitialized(ServletContextEvent arg0) {
try {
String userHomeDir = System.getProperty("user.home", ".");
String systemDir = userHomeDir + "/.rubrica";
// Set the db system directory and startup Server Derby for incoming connections.
System.setProperty("derby.system.home", systemDir);//il db viene salvato qui
derbyserver = new NetworkServerControl(InetAddress.getByName("localhost"), 1527);
derbyserver.start(pw);
log.info("Apache derby settings ok");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
log.error(e.getMessage());
}
}
#Override
public void contextDestroyed(ServletContextEvent arg0) {
if (derbyserver!=null){
...
}
}
When i deploy i get this error
[ERROR] An error occurred in the org.hibernate.ejb.HibernatePersistence persistence provider when attempting to create the entity manager factory of the testapp persistence unit container. The following error occurred: java.lang.NullPointerException
at org.hibernate.engine.jdbc.spi.TypeInfo.extractTypeInfo(TypeInfo.java:128)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:163)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:111)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:234)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:206)
at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1887)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1845)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:857)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:850)
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:425)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:849)
at org.hibernate.jpa.HibernatePersistenceProvider.createContainerEntityManagerFactory(HibernatePersistenceProvider.java:152)
at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:67)
at com.ibm.ws.jpa.management.JPAPUnitInfo.createEMFactory(JPAPUnitInfo.java:919)
at [internal classes]
When I debug on Liberty i see that Hibernate classes running before the #WebListener code (this is not the same thing in Tomcat), how can i resolve this issue? Something about class loading settings?
I try derby Embedded instead, but problem still araise again, in server.xml:
<properties.derby.embedded createDatabase="create" databaseName="C:/Users/myuser/.rubrica" shutdownDatabase="false"/>
<jdbcDriver>
<library>
<fileset dir="C:\programmiMio\java-eclipse\drivers" id="shared-libs"/>
</library>
</jdbcDriver>
Thanks
Roberto