51 Questions to Ask at an Enterprise Java Interview (With Sample Answers)
Enterprise JavaBeans, or EJB, are important application programming interfaces (APIs) for software professionals who work in large-scale development and application environments. When you go in for a job interview in software, the company may want to see how well you understand these metrics. Knowing what questions might be asked about the EJB can help you prepare for the interview and answer with confidence. This article goes into detail about 11 Enterprise JavaBeans interview questions and gives you 40 more questions to look over.51 Questions to Ask at an Enterprise Java Interview (With Sample Answers)
There are 11 questions about Enterprise JavaBeans, and each one has an example of how to answer it.
Review these 11 enterprise java bean interview questions and sample answers to help you prepare for your interview:
What is an Enterprise Bean, and how many different kinds are there?
This is probably the simplest question an employer will ask. How much you know about EJB right now can be shown by how you answer. The more detailed your answer, the more likely it is that the employer will believe in your skills and knowledge.
Example: “Enterprise JavaBeans talks about the environments and parts on the server side that help make Java-based business apps. There are three kinds of Enterprise Beans: session beans, entity beans, and message-driven beans.”
2. What is a session bean, and what are the three types of session beans?
Everyone knows the answer to this question. After you tell the employer what each type is, you can give them more details if they want them. If you can’t remember all three, try to think of at least two.
Example: “A session bean is an EJB that wraps up and makes real business logic. You can write code to ask for it from remote, local, and web service clients. Session beans can have no state, have multiple states, or only have one state.”
How do you make an EJB that doesn’t have a state?
When you answer, explain each type in more detail. If you can’t remember all of them, try to name and describe at least half of them. This can still show potential employers that you know a lot about this topic.
Example: “You need to do four main steps and two steps that depend on other steps to make a stateless EJB. First, you make the local interface, and then you use it with the client application. Use local annotation if the EJB client is the same. Use remote annotation if it’s not the same. Then, make a session bean that doesn’t keep any state and mark it with the stateless annotation.”
What is a Java message service, and how does it help?
This question is about something everyone should know, so give a short answer. It has many good points, but you don’t have to list all of them. Pay attention to the ones that matter the most.
Example: “A Java message service is a messaging service that makes, sends, and receives messages that don’t have to happen at the same time. Because the process is asynchronous, the client doesn’t have to ask for the message and can expect to get it on its own. This makes me feel better and makes me trust it.”
5. What is a session facade, and why is it important when building software?
If an employer wants to know why a certain idea is important, it’s probably because it’s important to their work and processes. To answer these questions, use what you know and what you’ve done. Try to think of at least two reasons that are different from each other.
Example: “A session facade is a type of design pattern that lets you access both the local interface and the enterprise bean. It acts as a service layer and hides how business objects talk to each other. The session facade is also very important because it makes the network work faster.”
What do you think of the persistence API? Which parts are most important?
Because persistence APIs are important to EJB, employers often ask about them. In your answer, briefly describe each part of the persistence API. This can help show how well you know your subject.
Example: “The Persistence API is a set of methods that help Java programmers store large amounts of data in databases. There are four main parts or elements that make up Persistence API. An entity, an entity manager, a persistence unit, and a datasource are the four parts.”
7. Write down and explain the ACID properties of transactions.
ACID properties are an important part of EJB, so a potential employer may expect you to know what the acronym stands for. Give a short explanation of each word, and make sure that your answers are all different. If the employer wants to know more, tell them.
Example: “An ACID has four qualities: it is atomic, stable, isolated, and long-lasting. Atomic is a term for combining different tasks into a single unit of work. Making sure things stay the same after a transaction is what consistency means. Isolation keeps people from seeing the results of other transactions that aren’t working well, and durability keeps the transaction going by using transitional logs.”
How are declarative transactions different, and what do they mean?
In this question, the employer wants you to name as many types as you can. First, explain what a declarative transaction is. Then, go over the different types. Describe each type in more detail if you have time or if the hiring manager asks.
Example: “Declarative transactions make it possible to handle transactions without having to write the source code by hand. Instead, you set up things. There are six different kinds of transactions that make statements. They are required, they need to be new, they help, they don’t help, and they never help.”
9.What is an EJB container, and what are the different kinds?
The employer may ask you this question to find out how skilled and knowledgeable you are right now. A short definition shows that you know what you are talking about.
Example: “An EJB container is a set of tools and ways of doing things that help developers manage enterprise bean applications and the process of putting them to use. The five containers are security support, support for persistence, support for transaction management, support for session management, and support for life cycle management.”
10. Which web servers can run EJB and which can’t?
Interviewers may ask you questions that aren’t what they seem to be in order to see how well you remember, how much you know, and how much experience you have. If you know how to confidently answer these questions, you can make a good impression on the employer. Make sure your answers are different from the question, and explain why your answer is the right one.
Example: “No web server, including Tomcat, can run EJB. From what I know, EJB can only be run on application servers like Websphere, Glassfish, or Weblogic.”
11. Explain what a web server is and how it differs from an application server.
To answer this question, you need to define the terms and see how they are alike and different. Show something about one term, and then talk about how the other is different. There are many differences, so try to list at least two or three.
Example: “There are many ways in which web servers and application servers are different. Both distributed transactions and EJB can be handled by application servers, but web servers can only handle JSP and servlets. An application server can hold web servers, but unlike web servers, it can offer many different features and services, such as load balancing, messaging, transaction management, and connection pooling.”
