EJB interview questions are core part of any Java J2EE interview. As EJB forms business layer for modern J2EE enterprise application, Good knowledge of EJB. 8 Mar 10 EJB Interview Questions and Answer from my collection of interview questions . I have been sharing interview questions on various topics. 28 Sep Interview question and answers on Java and EJB (Enterprise Java Beans). Good resource to test your skills and knowledge. If you have any.
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For example EJB module has a deployment descriptor ejb-jar.
Interview question and answers on Java and EJB 3
When an entity bean instance is in the ready state, the instance is associated with a specific entity object identity. No you can not run EJB in web server like Questios. What do you mean by EJB? It implements the web service through which other services can be run and performed in a way that the session can easily be maintained using just that.
Following are its attributes: The services are used of JMS Java Message service that allow the message queue to be created and a configuration files is being created using the MessageDriven syntax. It means a transaction must execute all or nothing at all.
20 EJB Interview Questions and Answers – Freshers, Experienced
Resource annotation is used to inject singleton services like timer service into an ejb. For example, error during ejb lookup. Explain what are transaction attributes. ACID property atomicity ,consistency,integrity,durability How to add or list certificates from keystore or t It also helps to execute queries using Query interface.
In context of EJB, there are two terms: EJB can be made to handle multiple transactions by enabling multiple Entity beans to handle every database and one Session Bean to retain transaction with the Entity Bean. It allows modular approach to be taken to implement the enterprise level applications using the APIs that is provided with the technology itself.
What is Abstraction in Java? The example is sending of the update to more than one node or the updates to more than one system. Abstract Class or Int Life Cycle of Entity Bean: It does not roll back the transaction unless it is specified in code by EJBContext.
EJB – Interview Questions
Can entity beans be specified as re-entrant? If a transactional context exists, a container acts like the transaction innterview is Required, else – like NotSupported. The synchronization operation can be performed to manage the transactions automatically for the bean.
J2EE platform have component based architecture to provide multi-tiered, distributed and highly transactional features to enterprise level applications.
Security model restriction enforcement: Following are the key points to be considered:. MessageDrivenBean annotation specifies that a given ejb class is a message driven bean.
Success meant all items executes successfully. It has high overhead due to maintainability of the client sessions but, it uses less resource intensive environment to execute the tasks.
The bean is used to call the server side components and run them on the client side. Following are the differences between stateful session bean and stateless session bean: The example that can be given in this case is checking a web store and logging in.
It has an additional tier. If you have not used two phase commit or distributed transaction along with EJB then you need to explore this topic in detail ejh3 answer this EJB interview question.
Why character array is better than String for Stor When the method is called after the persistence storage is written with the bean state, it is ejbPostCreate. Then EJB container treats it as Application level exception. Top 10 Java design pattern interview Questions – Answered.