JPA entity has no primary key?

Question

I have an Entity class:

@Entity
@Table(name=\"CMC_MAP_SERVER_INFO\")
@NamedQuery(name=\"CmcMapServerInfo.getMapServer\", query=\"SELECT c FROM CmcMapServerIn         


        

Answer 1

JPA 2.0 Specification

• Entity class must be annotated with the Entity annotation.
• Entity class must have a no-arg constructor.
• Entity class must not be final
• Entity class must implement the Serializable interfaces.
• Entity class must have a unique, immutable ID

Otherwise, you cannot.