Dirk Robbes [https://community.jboss.org/people/underflyer] created the discussion "EJB & PostgreSQL FK?" To view the discussion, visit: https://community.jboss.org/message/745268#745268 -------------------------------------------------------------- Hi everyone, im trying to deploy my EJB.jar on my new JBOSS 7.1.1. Well the deploy of the EJB-Container works like a charm. All Tables have been created, correctly. But I am unable to insert any Data in any Table where @ManyToOne Annotations are declared. Example: Unidirectional ManyToOne public class A {   private Integer id;   @Id   @GeneratedValue(stretegy=Generation.TYPE=Auto)   public Integer getId(){ return id;}   public void setId(Integer id){ this.id=id;} }   public class B {   private Integer id;   @Id   @GeneratedValue(stretegy=Generation.TYPE=Auto)   public Integer getId(){ return id;}   public void setId(Integer id){ this.id=id;}     private A a;   @ManyToOne   @JoinColumn(name="a_id", nullable=false)   public A getA() {return a;}   public void setA(A a){ this.a=a;} }     this code, creates in PostgresSQL two Tables with (a, b)  with the corresponding Columns (a = id) (b = id, a_id) Additional there are "two" (not one) ForeignKey Constraints defined, in Table "b": - fk.... foreign key (a_id) references a (id) - fk.... foreign key (id) references a(id) the second FK-Constraint makes trouble: INSERT A (id=1)  = OK! INSERT B (id=1, a_id=1) = OK! INSERT B (id=2, a_id=1) = ERROR !!!!!! DETAIL key (id) = 2 is not present in table "a" where is my fault? Thanks for Advice -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/745268#745268] Start a new discussion in EJB3 at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]