Do I need elements in persistence.xml?

by

The persistence.xml has a jar-file that you can use. From the Java EE 5 tutorial:

<persistence>
    <persistence-unit name="OrderManagement">
        <description>This unit manages orders and customers.
            It does not rely on any vendor-specific features and can
            therefore be deployed to any persistence provider.
        </description>
        <jta-data-source>jdbc/MyOrderDB</jta-data-source>
        <jar-file>MyOrderApp.jar</jar-file>
        <class>com.widgets.Order</class>
        <class>com.widgets.Customer</class>
    </persistence-unit>
</persistence>

This file defines a persistence unit
named OrderManagement, which uses a
JTA-aware data source jdbc/MyOrderDB. The jar-file and class elements specify managed persistence classes: entity classes, embeddable classes, and mapped superclasses. The jar-file element specifies JAR files that are visible to the packaged persistence unit that contain managed persistence classes, while the class element explicitly names managed persistence classes.

In the case of Hibernate, have a look at the Chapter2. Setup and configuration too for more details.

EDIT: Actually, If you don’t mind not being spec compliant, Hibernate supports auto-detection even in Java SE. To do so, add the hibernate.archive.autodetection property:

<persistence-unit name="eventractor" transaction-type="RESOURCE_LOCAL">
  <!-- This is required to be spec compliant, Hibernate however supports
       auto-detection even in JSE.
  <class>pl.michalmech.eventractor.domain.User</class>
  <class>pl.michalmech.eventractor.domain.Address</class>
  <class>pl.michalmech.eventractor.domain.City</class>
  <class>pl.michalmech.eventractor.domain.Country</class>
   -->

  <properties>
    <!-- Scan for annotated classes and Hibernate mapping XML files -->
    <property name="hibernate.archive.autodetection" value="class, hbm"/>

    <property name="hibernate.hbm2ddl.auto" value="validate" />
    <property name="hibernate.show_sql" value="true" />
  </properties>
</persistence-unit>

More Related Contents:

  1. Hibernate Annotations – Which is better, field or property access?
  2. How to map one class to different tables using hibernate/jpa annotations
  3. JPA JoinColumn vs mappedBy
  4. Difference between FetchType LAZY and EAGER in Java Persistence API?
  5. How to map a composite key with JPA and Hibernate?
  6. How to map an entity field whose name is a reserved word in JPA
  7. What’s the difference between JPA and Hibernate? [closed]
  8. What is the “owning side” in an ORM mapping?
  9. What is the solution for the N+1 issue in JPA and Hibernate?
  10. JPA CascadeType.ALL does not delete orphans
  11. What is the difference between persist() and merge() in JPA and Hibernate?
  12. JPQL Create new Object In Select Statement – avoid or embrace?
  13. How to annotate MYSQL autoincrement field with JPA annotations
  14. What is the difference between Unidirectional and Bidirectional JPA and Hibernate associations?
  15. How to remove entity with ManyToMany relationship in JPA (and corresponding join table rows)?
  16. JPA/Hibernate Native Queries do not recognize Parameters
  17. How to solve the LazyInitializationException when using JPA and Hibernate
  18. can someone please explain me @MapsId in hibernate?
  19. How do I properly cascade save a one-to-one, bidirectional relationship on primary key in Hibernate 3.6
  20. JPA: Implementing Model Hierarchy – @MappedSuperclass vs. @Inheritance
  21. Doing an “IN” query with Hibernate
  22. Specifying an Index (Non-Unique Key) Using JPA
  23. Inherited abstract class with JPA (+Hibernate)
  24. The onFlushDirty Hibernate Interceptor method is never called
  25. org.hibernate.MappingException: Could not determine type for: java.util.Set [duplicate]
  26. Difference between @MapKey, @MapKeyColumn and @MapKeyJoinColumn in JPA and Hibernate
  27. Hibernate throws strange error: Class is not mapped
  28. Batch inserts with JPA/EJB3
  29. Hibernate vs JPA vs JDO – pros and cons of each? [closed]
  30. Clarifying terminology – What does “hydrating” a JPA or Hibernate entity mean when fetching the entity from the DB

Leave a Comment