Hi,

I need help with @Version and Inheritance. This is what I am doing.

@MappedSuperclass
class BaseClass{

@Version
@Column(name = "version")
int version;
...
}

@Inheritance(strategy = InheritanceType.JOINED)
@Table(name = "A")
class A extends BaseClass {
...
}

@Table(name = "B")
class B extends A {
...
}
}

Physical table for B has a version and so does A. When I try to insert arecord in B I get the folowing error:

Caused by: java.sql.SQLException: Field 'version' doesn't have a default value
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)

How do I add @Version in Table A and B. Is it possible?

The JOINED inheritance type is a ONE-TO-ONE relationship. Every record in table B must have a related record in table A.
When you change a field of object B (wheather the field in Table A or B), the version in table A will be changed. So, you don't need another version field in TABLE B.