@Target(value={TYPE,METHOD})
 @Retention(value=RUNTIME)
public @interface Lock

Declares a concurrency lock for a singleton session bean with container managed concurrency.

This annotation may be specified on the bean class, the business methods of the bean class or both. Specifying the annotation on a business method overrides the value specified at class level, if any.

If this annotation is not used, a value of Lock(WRITE) is assumed.