[eclipselink-users] JPA Adding entity classes dynamically at runtime - I

["Hiller, Jan" <Jan.Hiller@xxxxxxxxxxxxxxxxxxxx>]

Hi,

 

I’m using EclipseLink 2.5.1 in a JavaSE Application.

 

I have the requirement to add entityclasses from jars to my persistence unit dynamically at runtime. I want to be able

to simply put new jars into a folder in the class path and load the entity classes by name.

 

This is the Main

 

public class App {

 

    private static EntityManagerFactory emf;

 

    public static void main(String[] args) {

 

        loginToDB();

       

        Person person = new Person();

        person.setName("Spiderman");

       

        Customer customer = new Customer();

        customer.setName("Superman");

       

        EntityManager em = emf.createEntityManager();       

        em.getTransaction().begin();

       

        em.persist(person);

        em.persist(customer);

       

        em.getTransaction().commit();

        em.close();

       

    }

 

    public static void loginToDB() {

        Map propertyMap = new HashMap();

        propertyMap.put("javax.persistence.jdbc.user", "TestUser");

        propertyMap.put("javax.persistence.jdbc.password", "pw");

        emf = Persistence.createEntityManagerFactory("db", propertyMap);       

    }

}

 

And here the persistence.xml

 

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

<persistence version="2.0" 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_2_0.xsd">

  <persistence-unit name="db" transaction-type="RESOURCE_LOCAL">

    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>

    <exclude-unlisted-classes>false</exclude-unlisted-classes>

    <properties>

      <property name="eclipselink.canonicalmodel.subpackage" value="one"/>

      <property name="eclipselink.jdbc.batch-writing" value="JDBC"/>

      <property name="eclipselink.jdbc.batch-writing.size" value="1000"/>

      <property name="javax.persistence.jdbc.url" value="jdbc:derby://localhost:1527/Database"/>

      <property name="javax.persistence.jdbc.password" value="pw"/>

      <property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.ClientDriver"/>

      <property name="javax.persistence.jdbc.user" value="TestUser"/>

      <property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>

    </properties>

  </persistence-unit>

</persistence>

 

 

The Class Person is in the MainProject and detected by “<exclude-unlisted-classes>false</exclude-unlisted-classes>” while the Customer class is in an other Project as Dependency and NOT detected. Is there any solution to add the customer class programmatically to the persistence unit?