If a have a entity like this(is just an example :D) | @Entity | @Name("person") | public class Person implements Serializable { | private Long id; | private String firstName; | private String lastName; | private int age; | | @Id | @GeneratedValue | public Long getId() { | return id; | } | | public void setId(Long id) { | this.id = id; | } | | @NotNull | @Length(max=50) | public String getFirstName() { | return firstName; | } | | public void setFirstName(String firstName) { | this.firstName = firstName; | } | | @NotNull | @Length(max=50) | public String getLastName() { | return lastName; | } | | public void setLastName(String lastName) { | this.lastName = lastName; | } | | @Min(0) | public int getAge() { | return age; | } | | public void setAge(int age) { | this.age = age; | } | } | And i would like to know how can i create a validation method telling seam to use the firstName and the lastName as a compound id for the entity without mapping that to the database? I want to use the id property as the id for the mapping but the logic has to be in a method. If this logic is in a @PrePersist annotates method i can only compare the entity properties but not compare them with the persisted ones. I would like to know how can i compare if there is an existent entity in the data source like the one i'm trying to persist. Maybe i have to override the equals method? At witch layer do i have to do this validation rule? It would be ideal to have that logic in the domain model and not have it in some stateless or statefull bean. Thanks in advance Humber View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4048860#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...