<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="ecf" transaction-type="RESOURCE_LOCAL">
    	<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    	
		<properties>
			<property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver" />
			<property name="javax.persistence.jdbc.url" value="jdbc:postgresql://127.0.0.1:5432/ecf" />
			<property name="javax.persistence.jdbc.user" value="postgres" />
			<property name="javax.persistence.jdbc.password" value="adminadmin" />

			<property name="eclipselink.jdbc.read-connections.min" value="1" />
			<property name="eclipselink.jdbc.write-connections.min" value="1" />
			<property name="eclipselink.jdbc.batch-writing" value="JDBC" />

			<property name="eclipselink.logging.level" value="FINE" />
			<property name="eclipselink.logging.thread" value="false" />
			<property name="eclipselink.logging.session" value="false" />
			<property name="eclipselink.logging.exceptions" value="true" />
			<property name="eclipselink.logging.timestamp" value="true" />
		</properties>
	</persistence-unit>
</persistence>

private static EntityManagerFactory emf = null;
    private static Map<String, Object> properties = new HashMap<String, Object>();

    private static void init() {
        properties.put(PersistenceUnitProperties.TARGET_DATABASE, "Derby");
        properties.put(PersistenceUnitProperties.JDBC_DRIVER, Driver.class.getCanonicalName());
        properties.put(PersistenceUnitProperties.JDBC_URL,"jdbc:postgresql://127.0.0.1:5432/ecf");
        properties.put(PersistenceUnitProperties.JDBC_USER, "postgres");
        properties.put(PersistenceUnitProperties.JDBC_PASSWORD, "adminadmin");
        properties.put(PersistenceUnitProperties.CONNECTION_POOL_MIN, "1");
       
        properties.put(PersistenceUnitProperties.BATCH_WRITING, "JDBC");
        properties.put(PersistenceUnitProperties.CLASSLOADER, ECFEntityManager.class.getClassLoader());
        properties.put("eclipselink.logging.level", "FINE");
        properties.put("eclipselink.logging.timestamp", "false");
        properties.put("eclipselink.logging.session", "false");
        properties.put("eclipselink.logging.thread", "false");

        emf = Persistence.createEntityManagerFactory("ecf",properties);

    }

    public static EntityManager createEntityManager() {
        if (emf == null)
            init();

        return emf.createEntityManager();
    }

org.osgi.framework.BundleException: The activator br.com.german.plugin.Activator for bundle br.com.german.plugin is invalid
	at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:171)
	at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:679)
	at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381)
	at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:389)
	at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1130)
	at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:559)
	at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:544)
	at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:457)
	at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:243)
	at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:438)
	at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:1)
	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
	at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)
Caused by: javax.persistence.PersistenceException: No Persistence provider for EntityManager named ecf
	at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source)
	at br.com.german.plugin.entityManager.ECFEntityManager.init(ECFEntityManager.java:33)
	at br.com.german.plugin.entityManager.ECFEntityManager.createEntityManager(ECFEntityManager.java:44)
	at br.com.german.plugin.Activator.<init>(Activator.java:24)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
	at java.lang.Class.newInstance0(Class.java:355)
	at java.lang.Class.newInstance(Class.java:308)
	at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:166)
	... 12 more