spring - neo4j Error mapping GraphModel to instance -

i have problem neo4j , spring. want use ogm create endpoint managing entities.

the following lines controller:

@controller @enableautoconfiguration @requestmapping("/customer") public class mainapp {  @requestmapping(method = requestmethod.get) @responsebody string customerinfo(){     return "uuid fehlt"; }  @requestmapping(path="/{id}", method = requestmethod.get) public customer getbyid(@pathvariable  long id) {     customerservice customerservice = new customerservice();     return customerservice.find(id);  }  @requestmapping("/create") @responsebody customer home() {     customerservice customerservice = new customerservice();     customer c=new customer("peter");     c=customerservice.createorupdate(c);     return c; }  public static void main(string[] args) throws exception {     springapplication.run(mainapp.class, args); } 

creation works fine , responds proper json, containing information new generated node.

when try query node using id, receive error: error mapping graphmodel instance of datahandler.entities.customer

the problem seems somewhere in method find:

abstract class genericservice<t extends entity> implements service<t> {  private static final int depth_list = 0; private static final int depth_entity = 1; protected session session = neo4jsessionfactory.getinstance().getneo4jsession();  @override public iterable<t> findall() {     return session.loadall(getentitytype(), depth_list); }  @override public t find(long id) {     return session.load(getentitytype(), id, depth_entity); }     @override public void delete(long id) {     session.delete(session.load(getentitytype(), id)); }  @override public t createorupdate(t entity) {     session.save(entity, depth_entity);     return find(entity.getid()); }  abstract class<t> getentitytype(); 

}