EJB3 INTERVIEW QUESTIONS AND ANSWERS PDF

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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All these problem persist till EJB 2.

What ahd component-based development architecture? Why we use Threads in Java? The data consistency is maintained by updating their fields every time a commitment of the transaction is made. If you create an entity bean, you need to remember unterview it is usually used with a local client view. What is two phase commit? Security model restriction enforcement: MDBs have same life cycle like stateless session bean. A session in a Servlet, is maintained by the Servlet Container through the HttpSession object, that is acquired through the request object.

The example is used of price list that is global everywhere and need to be updated all the time. What is Abstraction in Java?

What are the call back methods in Entity bean setEntityContext 2. Public abstract void ejbCreate. This consists of all the enterprise bean instances that are distributed and running in a separate java virtual machines. Tibco RV tips and commands Tibco Tutorial: There are three types of enforcement that can be shown below: So just feel confident during your interview.

The example for this is sending an email for the customer support as it is just one way operation and request reply and request from both the ends at a single time so it is handled by stateless session beans.

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You design beans that can contain business logic, and that can be used answsrs the clients. If you have not used two phase commit or distributed transaction along with EJB then you need to explore this topic in detail to answer this EJB interview question.

Interview question and answers on Java and EJB 3

The basic requirement of a CMP is an abstract class which the container extends and gets the methods implemented required for managing the relationships. PrePersist – method is invoked when an entity is created in database. Annotations are applied at class level.

Following is the list of callback annotations for stateless bean: Share to Twitter Share to Facebook. To build a bean for a particular use lot of requirements that has to be kept in mind is listed below: Does not exists, Method Ready and Passivated states.

Java based applications use JNDI for naming and directory services. Binding – This refers to assigning a name to an ejb object which can be used later. How to check if a thread holds lock on a particula Following is the list of callback annotations for stateful bean: Lookup – This refers to looking up and getting an object of ejb. A method executes only if no transaction context is specified. Success meant all items executes successfully. DeclareRoles – Indicates that class will accept those declared roles.

Dear readers, these EJB 3. What are the different types of EJB?

20 EJB Interview Questions and Answers – Freshers, Experienced

When the method is called before the persistence storage is written with the bean state, it is ejbCreate. It allows modular approach to be taken to implement the enterprise level applications using the APIs that is provided with the technology itself. In context of EJB, there are two terms: We will see some of those in 10 interview questions on EJB. Life Cycle of Stateless session bean: These allow easy access to it and maintainability allow it to be maintained on the server for other purpose and uses.

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It allows the development tools to have different levels of checking tools that checks for the bugs and errors before finally deploying the servers. In other words, if one enterprise bean is always associated with another, it is perfectly appropriate to co-locate them i.

If the Container is not wanted by the developer for managing transactions, every inherview operation can be implemented to write the suitable JDBC code. You cannot really instantiate a new HttpSession object, and it does not contains any business logic, but is more of intfrview place where to store objects.

Interview question and answers on Java and EJB 3

For Example when we do online banking transaction ,online reservation we use stateful session bean. It has a component architecture that is very essential for the maintenance and the developing a Java Platform.

How to check if two String are Anagram in Java – P EJB Timer Service is a service provided by Ejb container which helps to create timer and to schedule callback when timer expires. The problems that are caused as follows: Other interview question to prepare for J2EE interviews: What is connection pooling feature of EJB container? Transaction Attribute conveys to the container the intended transactional behavior of the associated EJB component’s method.