App Engine JPA Datastore delete entity
===

im trying to build a google app engine projekt with JPA, JAX-RS and JAX-B. My POST and GET Methods work, but my DELETE method doesn't delete the data.

Resource

     @DELETE
     @Path("card/{id}")
     public void deleteCardById (@PathParam ("id") Long id) {
    	Service.removeCard(id);
     }

 
Service

	public static void removeCard(Long id) {
		EntityManager em = EMFService.get().createEntityManager();
		Card emp = findCard(id);
		if (emp != null) {
			em.remove(emp);
		}
		em.close();
	}

	public static Card findCard(Long id) {
		EntityManager em = EMFService.get().createEntityManager();
		Card card = em.find(Card.class, id);
		em.close();
		return card;
	}

Entity

    @XmlRootElement
    @Entity
    public class Card {
    	@Id
    	@GeneratedValue(strategy = GenerationType.IDENTITY)
    	Long id;
        String begriff;
        String tabu1;
        String tabu2;
        String tabu3;
    public Card(String begriff, String tabu1, String tabu2, String tabu3) {
    		super();
    		Begriff = begriff;
    		Tabu1 = tabu1;
    		Tabu2 = tabu2;
    		Tabu3 = tabu3;
    	}
    	
    	public Card() {
    		
    	}
    
    	public Long getId() {
    		return id;
    	}
    
    	public void setId(Long id) {
    		this.id = id;
    	}
    
    	public String getBegriff() {
    		return Begriff;
    	}
    
    	public void setBegriff(String begriff) {
    		Begriff = begriff;
    	}
    
    	public String getTabu1() {
    		return Tabu1;
    	}
    
    	public void setTabu1(String tabu1) {
    		Tabu1 = tabu1;
    	}
    
    	public String getTabu2() {
    		return Tabu2;
    	}
    
    	public void setTabu2(String tabu2) {
    		Tabu2 = tabu2;
    	}
    
    	public String getTabu3() {
    		return Tabu3;
    	}
    
    	public void setTabu3(String tabu3) {
    		Tabu3 = tabu3;
    	}
    
    	@Override
    	public String toString() {
    		return "Card [Begriff=" + Begriff + ", Tabu1=" + Tabu1 + ", Tabu2="
    				+ Tabu2 + ", Tabu3=" + Tabu3 + "]";
    	}

When i Debug the app it gives the correct Object to the remove function. But it just don't remove the data ...