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Users may also use the EntityManager API outside the container by creating a EntityManagerFactory for a given persistence unit name and properties map (includes database information etc.)

EntityManagerFactory emf = Persistence.createEntityManagerFactory(persistenceUnitName, propertiesMap);
EntityManager em = emf.createEntityManager();

JavaSE Configuration using Property Map

When a simple persistence unit configuration is defined which relies on container deployment:

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

In order to test this persistence unit outside of the container the JavaSE bootstrapping API must be used. the following code can be used to customize the configuration:

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import static org.eclipse.persistence.config.PersistenceUnitProperties.*;


    Map properties = new HashMap();

    // Ensure RESOURCE_LOCAL transactions is used.

    // Configure the internal EclipseLink connection pool
    properties.put(JDBC_DRIVER, "oracle.jdbc.OracleDriver");
    properties.put(JDBC_URL, "jdbc:oracle:thin:@localhost:1521:ORCL");
    properties.put(JDBC_USER, "scott");
    properties.put(JDBC_PASSWORD, "tiger");
    properties.put(JDBC_READ_CONNECTIONS_MIN, "1");
    properties.put(JDBC_WRITE_CONNECTIONS_MIN, "1");

    // Configure logging. FINE ensures all SQL is shown
    properties.put(LOGGING_LEVEL, "FINE");
    properties.put(LOGGING_TIMESTAMP, "false");
    properties.put(LOGGING_THREAD, "false");
    properties.put(LOGGING_SESSION, "false");

    // Ensure that no server-platform is configured
    properties.put(TARGET_SERVER, TargetServer.None);

Now the PU can be instantiated for testing using:

Persistence.createEntityManagerFactory(unitName, properties);