Java EE 8 Cookbook

How to do it...

The recipe will show you three scenarios.

In the first scenario, LockType is defined at the class level:

@Singleton@ConcurrencyManagement(ConcurrencyManagementType.CONTAINER)@Lock(LockType.READ)@AccessTimeout(value = 10000)public class UserClassLevelBean {    private int userCount;    public int getUserCount() {        return userCount;    }        public void addUser(){        userCount++;    }}

In the second scenario, LockType is defined at the method level:

@Singleton@ConcurrencyManagement(ConcurrencyManagementType.CONTAINER)@AccessTimeout(value = 10000)public class UserMethodLevelBean {    private int userCount;        @Lock(LockType.READ)    public int getUserCount(){        return userCount;    }        @Lock(LockType.WRITE)    public void addUser(){        userCount++;    }}

The third scenario ...