Java Enterprise Architecture Interview Questions

Java Enterprise Architecture interview questions

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Total Questions: 5

1. The findByXXX() method in the Home Interface of an entity bean returns ____. Choose 2.

A. An Instance of java.lang.Object

B. An instance of the Remote Reference to the bean

C. An instance of the Bean class

Correct Answer is : An instance of the Remote Reference to the bean

2. You are the lead architect for a project that requires interfacing with existing CORBA systems. You are planning to use Java IDL to integrate with these other systems. Which of the following statements about Java IDL are true?

A. Java IDL allows Java to use CORBA.

B. Java IDL should be used when most of your new Java applications will be entirely Java based.

C. Java IDL has nothing to do with CORBA. To communicate with CORBA you will need to use J2C (Java 2 CORBA).

D. Java IDL has nothing to do with CORBA. To communicate with CORBA you will need to use JNI (Java native interface) and J2C (Java 2 CORBA).

Correct Answer is : Java IDL allows Java to use CORBA.

3. In the Publish subscribe messaging architecture, publishers send messages to:

A. A specified node, which is then re-distributed to all subscribers.

B. Directly to all subscribers in the Topic subscription list.

C. A designated queue.

D. A component transaction monitor such as an EJB Server for further processing by a message driven bean.

Correct Answer is : A specified node, which is then re-distributed to all subscribers.

4. Which of the following are true about N-Tier Systems?

A. N-Tier systems are distributed over many systems and hence always present a maintenance problem.

B. Since N-Tier systems do not use database stored procedures or triggers for business logic processing, they are generally very slow.

C. It is difficult to improve performance in N-Tier systems.

D. Since N-Tier systems are container based; many N-Tier systems can be easily scaled (both vertically and horizontally).

Correct Answer is : Since N-Tier systems are container based; many N-Tier systems can be easily scaled (both vertically and horizontally).

5. EJB1.1 has support for undefined Primary Keys. This means that the Primary Key can be undefined until deployment time. When we use defined Primary Keys, the Bean class and the Interfaces use the BeanPK type to identify the key. What do the Bean class and the Interfaces refer to in the case of undefined Primary Keys?

A. Though the Primary Key itself can be undefined, its name must be predetermined. The Bean class and the Interfaces use this name.

B. An instance of java.util.Enumeration

C. An instance of java.lang.Class

D. An instance of java.lang.Object

Correct Answer is : An instance of java.lang.Object

Java Enterprise Architecture interview questions