[jboss-user] [Persistence, JBoss/CMP, Hibernate, Database] - Advanced problems with Jboss and Hibernate !

Hi every body, Look at these classes examples to see my problems with hibernate on jboss (for a mySql database) and understand what i want to do : @Entity @Table(name=Mother) @Inheritance(strategy = InheritanceType.JOINED) public class Mother implements Serializable{ @Id private String mother_id; public Mother(){} //... getters/setters generated for all fields members } Note : The Mother table has a single primary key : its id @Embeddable public Class DaughterKey implements Serializable{ private String mother_Id; private String daughter_id; public DaughterKey(){} //getters/setters generated for the both fields // the methods : toString(),hasCode(),equals() are overrided } Note : the DaughterKey is a class that specifies (according to my understandings) a composite primary key class when mappings happen ! @Entity @Table(name = "Daughter") @IdClass(DaughterKey.class) @PrimaryKeyJoinColumn(name = "Mother_id") public class Daughter extends Mother{ @Id private String daughter_id; public Daughter(){ super();} //.. getter/setter for all fields } Note: the Daughter table has a composite key (mother_Id+daughter_id). So,the idea is that eventhough a Daughter Class extends a Mother Class, the Daughter must have 2 fields-members as PrimaryKey in the Database (the mother_id and its own daughter_id) : a composite key. After compiling and creating a JAR file, I try to deploy the JAR-file and i have a such exception : java.lang.reflect.InvocationTargetException //.... at .... caused by org.hibernate.AnnotationException : Unable to define/override @Id(s) on a subclass : Daughter. Thanks a lot if someOne can help me, I know that it's because my conception is not correct but I can't get any better ided. PS : Ask your questions, if you don't understand my idea ! Best regards, Divx. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3984923#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...