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31.How EJB implements dependency injection? EJB 3.0 specification provides annotations which can be applied on fields or setter methods to inject dependencies. EJB Container uses the global JNDI registry to …

21.What is Callback in EJB? Callback is a mechanism by which life cycle of an enterprise bean can be intercepted. EJB 3.0 specification has specified callbacks for which callback handler …

  11.Explain @javax.ejb.Stateless annotation. @javax.ejb.Stateless annotation specifies that a given ejb class is a stateless session bean.Following are its attributes: name – Used to specify name of the session bean. …

1.What is EJB? EJB stands for Enterprise Java Beans. EJB is an essential part of a J2EE platform. J2EE platform have component based architecture to provide multi-tiered, distributed and highly …

41.is Visitor pattern? In Visitor pattern, we use a visitor class which changes the executing algorithm of an element class. By this way, execution algorithm of element can vary as …

31.What are the entities of Service Locator pattern? Following are the entities of this type of design pattern. Service – Actual Service which will process the request. Reference of such …

21.What is Composite pattern? Composite pattern is used where we need to treat a group of objects in similar way as a single object. Composite pattern composes objects in term …

1.What are Design Patterns? Design patterns represent the best practices used by experienced object-oriented software developers. Design patterns are solutions to general problems that software developers faced during software development. …

41.Write a query to delete a table from database.? DROP TABLE table-name is the syntax to delete a table from database.

31.When you will face SQLCODE -911? At the time of deadlock or timeout you will face SQLCODE -911.