> > If a person becomes a director, (s)he won't be able to > resign and become a manager or just a developer?
that's right. for my application it is assumed that if a person is a director this person is just a director and cannot be an actor in the same time. > > On to your issue... > > > so i want to write a Person first, to keep it simple. unfortunately i get an > > error when i try to perform a write: > > Could you show us how Person looks like? And your persistence.xml too. > I assume you don't use orm.xml or alike, do you? If so, show it too. so thanks, the persistence.xml we discussed a lot already if i remember right ;): <persistence 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/persistence_1_0.xsd"; version="1.0"> <persistence-unit name="valhalla" transaction-type="JTA"> <description>videothek</description> <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider> <class>vt.bean.entity.Person</class> <class>vt.bean.entity.Actor</class> <class>vt.bean.entity.Director</class> <class>vt.bean.entity.Movie</class> <class>vt.bean.entity.Dvd</class> <properties> <property name="openjpa.jdbc.DBDictionary" value="postgres"/> <!--property name="openjpa.LockManager" value="pessimistic"/--> </properties> <jta-data-source>jdbc/postgres</jta-data-source> <non-jta-data-source>jdbc/postgres</non-jta-data-source> </persistence-unit> </persistence> -------------------------------------------------------- the Person entity: -------------------------------------------------------- /*Persistent Entity Person*/ @Entity @Table(name="person") @Inheritance(strategy=InheritanceType.JOINED) @DiscriminatorColumn(name="role", discriminatorType=DiscriminatorType.STRING) @DiscriminatorValue("P") public class Person implements java.io.Serializable { private int id; private String name; private Calendar birthdate; private String origin; @Id @GeneratedValue public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Temporal(TemporalType.DATE) public Calendar getBirthdate() { return birthdate; } public void setBirthdate(Calendar birthdate) { this.birthdate = birthdate; } public String getOrigin() { return origin; } public void setOrigin(String origin) { this.origin = origin; } } and yes i do not use an orm.xml thanks a lot for helping, greetings, mario. > > Jacek > > -- > Jacek Laskowski > Notatnik Projektanta Java EE - http://www.JacekLaskowski.pl
