3.4.2 Version Attributes
The Version field or property is used by the persistence provider to perform optimistic locking. It is
accessed and/or set by the persistence provider in the course of performing lifecycle operations on the
entity instance. An entity is automatically enabled for optimistic locking if it has a property or field
mapped with a Version mapping.
An entity may access the state of its version field or property or export a method for use by the application
to access the version, but must not modify the version value. With the exception noted in section
4.10, only the persistence provider is permitted to set or update the value of the version attribute in
the object.

<shared-cache-mode>NONE</shared-cache-mode>

protected Object getInitialWriteValue(AbstractSession session) {
        return Long.valueOf(1);
    }

public class GenericSessionCustomizer implements SessionCustomizer {

    public class GenericVersionLockingPolicy extends VersionLockingPolicy {
       
        public GenericVersionLockingPolicy(DatabaseField field){
            super(field);
            storeInObject();
        }
        //Override methods
    }
    
    @Override
    public void customize(Session session) throws Exception {
        for (ClassDescriptor descriptor : session.getDescriptors().values()) {
            OptimisticLockingPolicy orig = descriptor.getOptimisticLockingPolicy();
            descriptor.setOptimisticLockingPolicy(new GenericVersionLockingPolicy(orig.getWriteLockField()));
        }
    }
}

public class GenericDescriptorCustomizer implements DescriptorCustomizer {

    public class GenericVersionLockingPolicy extends VersionLockingPolicy {

        public GenericVersionLockingPolicy(DatabaseField field) {
            super(field);
            storeInObject();
        }
        //Override methods
    }

    @Override
    public void customize(ClassDescriptor descriptor) throws Exception {
        OptimisticLockingPolicy op = descriptor.getOptimisticLockingPolicy();
        descriptor.setOptimisticLockingPolicy(new GenericVersionLockingPolicy(op.getWriteLockField()));
    }
}