Persistence unit: From Toplink To Hibernate

nat101 · **Joined:** Thu Jan 22, 2009 2:28 pm **Posts:** 3

I am switching from Glassfish / toplink To JBoss / Hibernate.
For this project I dl'd the JBoss dev studio ide and installed AS 5.0 GA, and started a new workspace. My code base is on another workspace on which I worked with standard Eclipse 3.4 EE and Glassfish. (am familiar with JBoss semantics from the 3/4.x ejb 2 days.)

I am importing the projects into the new JBoss workspace, and removing Glassfish stuff and replacing with JBoss. No sweat.

Am also switching to Hibernate from toplink.

1. Can I expect my code to run outta the box?

2. Can anyone please give me the hibernate equivalent of the following persistence.xml?

Code:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
   xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">

   <persistence-unit name="OldserverDerbyLogtrak"   transaction-type="JTA">
      <description>On Oldserver, in the same dir where you have the ezjpa database.</description>
      <jta-data-source>jdbc/ezLogtrkOldserver</jta-data-source>
      <properties>
         <property name="toplink.target-database" value="Derby" />
         <property name="toplink.logging.level" value="FINE" />
         <property name="toplink.ddl-generation" value="drop-and-create-tables" />
         <!--<property name="toplink.ddl-generation" value="none" /> -->
      </properties>
   </persistence-unit>
</persistence>

3. Do I enable Hibernate 3.0 support on the projects?

Thank you much.
natG

iuliana · **Posted:** Thu Jan 22, 2009 3:26 pm

Try something like this:

Code:

<?xml version="1.0" encoding="UTF-8"?>

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
   version="1.0">
   <persistence-unit name="entityManagerFactory" >
      <provider>org.hibernate.ejb.HibernatePersistence</provider> 
       <mapping-file>shared/hbm/Learning.hbm.xml</mapping-file>
       <mapping-file>shared/hbm/Participant.hbm.xml</mapping-file>
       <class>shared.model.Learning</class> 
      <properties>
         <property name="hibernate.archive.autodetection" value="class, hbm" />

         <!-- MySQL -->
         <property name="hibernate.connection.driver_class"
            value="com.mysql.jdbc.Driver" />
         <property name="hibernate.connection.url"
            value="jdbc:mysql://localhost:3306/test" />
         <property name="hibernate.connection.username"
            value="user" />
         <property name="hibernate.connection.password"
            value="password" />
         <property name="hibernate.dialect"
            value="org.hibernate.dialect.MySQLDialect" />

         <!--  HSearch settings -->
         <property name="hibernate.search.default.indexBase"
            value="/home/iuliana/lucene/indexes" />
         <property name="hibernate.search.default.directory_provider"
            value="org.hibernate.search.store.FSDirectoryProvider" />
      </properties>
   </persistence-unit>
</persistence>

nat101 · **Joined:** Thu Jan 22, 2009 2:28 pm **Posts:** 3

Sorry. I don't get it.

cbredesen · **Posted:** Thu Jan 22, 2009 11:35 pm

toplink.target-database: I guess this is hibernate.dialect. Use org.hibernate.dialect.DerbyDialect
toplink.logging.level: For Hibernate, this is controlled by Log4J (in JBoss this is server/default/conf/jboss-log4j.xml)
toplink.ddl-generation: For Hibernate, this is hibernate.hbm2ddl.auto

This is all covered in the manual.

http://www.hibernate.org/hib_docs/refer ... n-optional

Welcome to Hibernate and whatever you do, ignore the last user's information. That configuration uses the built-in Hibernate connection pool. Your existing config will actually work out of the box but Hibernate won't create the schema by default.

Good luck.

nat101 · **Joined:** Thu Jan 22, 2009 2:28 pm **Posts:** 3

Thanks for the info and pointer in the manual. I figured that although it is politically correct to first read the manual, this however seemed so simple, and not a problem issue, and was certain that pros here will take a few seconds to respond. And one did! Thanks.
nat