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    <p>Enterprise Java beans are useful components to build your logic a part from your client and respect the notion of the OOP of hiding the implementation. Whenever you want to create a EJB, also a simple one, you have to define which methods you want to expose, depending on the use that you will do of your logic.</p> <p>In order to expose the "service" to your client you will define which methods can be called and this is done through defining an interface that is a remote interface. For a more general comprehension you can look a the concept of Session façade <a href="http://www.corej2eepatterns.com/Patterns2ndEd/SessionFacade.htm" rel="nofollow">j2ee patterns</a>.</p> <pre><code>import javax.ejb.Remote; @Remote public interface IUser { public Boolean doLogin(String user, String pass); public void doLogout(); } </code></pre> <p>Inside your interfaces you should be able to provide all the operation, or a set of operation, that will be used by the client using your EJB(stateless/statefull). Remember that interfaces are given to the client that will use them to call these methods.</p> <p>When you go implementing your interface you won't build a single. long, incomprehensible class but rather you will have different pojos or libraries that does the job for you. </p> <p>In this way you follow a business object (<a href="http://www.corej2eepatterns.com/Patterns2ndEd/BusinessObject.htm" rel="nofollow">BusinessObject j2ee patterns</a>) model: this pattern is very useful and used to separate business data and business logic (EG. Use pojo for logic and Entity in Dao for business data holder).</p> <p>As last part, you can use the abstract class in your business. There is always fights against composition and inheritance, you should use abstract class when you don't want anyone to instantiate that type of class. It is a design choise to use "is a" rather then "has a"..</p>
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    1. COplease take care as much as possible when implements core J2EE patterns. Were usefull 10 years ago, but already many of them are actually deprecated. A common (and modern good practice) pattern for your purpose could be service façade . Please refer to this: http://www.adam-bien.com/roller/abien/entry/servicefacade_in_greater_detail_and
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