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42 Enterprise JavaBean Interview Questions and Answers

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Interview1. What is EJB
EJB stands for Enterprise JavaBean and is a widely-adopted server side component architecture for J2EE. It enables rapid development of mission-critical application that are versatile, reusable and portable across middleware while protecting IT investment and preventing vendor lock-in.   

2. What is session Facade?
Session Facade is a design pattern to access the Entity bean through local interface than accessing directly. It increases the performance over the network. In this case we call session bean which on turn call entity bean.

3. What is EJB role in J2EE?
EJB technology is the core of J2EE. It enables developers to write reusable and portable server-side business logic for the J2EE platform.

4. What is the difference between EJB and Java beans?
EJB is a specification for J2EE server, not a product; Java beans may be a graphical component in IDE.

Last Updated on Saturday, 01 October 2011 19:11 Read more...
 

129 Core Java Interview Questions and Answers

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Interview
  1. What is the most important feature of Java?
    Java is a platform independent language.

  2. What do you mean by platform independence?
    Platform independence means that we can write and compile the java code in one platform (eg Windows) and can execute the class in any other supported platform eg (Linux,Solaris,etc).

  3. Are JVM's platform independent?
    JVM's are not platform independent. JVM's are platform specific run time implementation provided by the vendor.

  4. What is a JVM?
    JVM is Java Virtual Machine which is a run time environment for the compiled java class files.
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