So you have finally found your dream job in J2EE, but are wondering how to crack the 2026 J2EE Interview and what the probable J2EE Interview Questions could be. Every interview is different, and the scope of a job is different too. With this in mind, we have compiled a list of the most common J2EE interview questions and answers to help you succeed in your interview.
Below are the top J2EE interview questions that are asked frequently in an interview; these Top interview questions are divided into parts, which are as follows:
Part 1 – J2EE Interview Questions (Basic)
This first part covers basic J2EE interview questions and answers.
Q1. What is J2EE? Name its components and client types.
Answer:
J2EE stands for Java 2 Enterprise Edition. Its functionality includes developing multi-tier web-based applications. This platform consists of a set of services, protocols, and APIs.
Components are:
- Client-tier components: These are the ones that execute on the client machine
- Web tier components: These get executed on the J2EE server.
- Business tier components: They get executed on the J2EE server
- Enterprise-level system software: They get executed on the EIS server.
J2EE Client types:
- Application clients
- Applets
- Java web-enabled clients who use Java Web Start technology
- Wireless clients that are based on the Mobile Information Device Profile, popularly known as MIDP technology
Q2. What is MVC on Struts?
Answer:
The MVC, popularly known as Model-View-Controller, can be described in detail.
- Model: The model represents the system’s internal workings as a single entity or as multiple JavaBean entities.
- View: Represents the user interface, commonly built using JSP pages.
- Controller: This is the processor that focuses on receiving client requests and delivering a new user interface set as per the request. The primary component in the framework is the “ActionServlet” servlet class.
Let us move on to the following J2EE Interview Questions.
Q3. What is ORM and its benefits?
Answer:
These are the basic J2EE Interview Questions asked in an interview. ORM stands for object-relational mapping. Metadata maps Java class objects to relational database tables by describing the relationship between the objects and the database. It transforms the data from one object to another. The benefits include:
Benefits of ORM:
- Maintainability: This ensures that all code generated by the ORM is well-tested and that correcting functionality is only something the developer can do.
- Productivity: It ends up reducing the time for data-level access coding using automatic code creation, which is based on a defined data model and tools
- Performance: The code generated from the ORM is used to manage the application’s data access needs. We do not need to create any data access code, as the existing code already optimizes data access.
- Vendor independence: The code generated from ORM is independent of the vendor. Developers do this to improve the application’s portability.
Q4. Explain important methods such as save(), Saveorupdate(), load(), get()?
Answer:
The save() method in Hibernate stores an object in the database. The system also checks for duplicate records before inserting them.
On the other hand, save() or update() updates the object using its identifier. Once the identifier value becomes NULL, you can call the save() method directly.
When the object is unavailable in both the cache and the database, load() throws an exception. It returns no null value.
When the object is unavailable in either the database or the cache, get() returns null.
| Method | Purpose |
| save() | Stores a new object in the database. |
| saveOrUpdate() | Saves a new object or updates an existing one based on its identifier. |
| load() | Returns a proxy object and throws an exception if the object is not found. |
| get() | Returns the actual object and returns null if not found. |
Q5. What is Spring? Explain its advantages.
Answer:
Spring is an open-source Java-based application that aims to reduce the complexity of enterprise application development. It is based on inversion of control or dependency injection design patterns.
The advantages of using Spring for application development are as follows:
- Developers create POJOs (Plain Old Java Objects), which facilitate the reuse of existing components.
- It is possible to reduce the development cost by improving application development productivity.
- Dependency injection improves the testability of the application.
- It improves maintainability by reducing code coupling.
- It minimizes the need for an application server and supports enterprise services.
Benefits of using the Spring framework:
- Spring Framework allows for the organization of middle-tier objects in a much more efficient way.
- Properties initialization is easy.
- Easy testing of components
- Lightweight container
- Spring Framework enables the configuration of management services in any runtime environment and at any architectural layer.
Part 2 – J2EE Interview Questions (Advanced)
Let us now have a look at the advanced J2EE Interview Questions.
Q6. Describe the Servlet?
Answer:
Servlets are server-side components that provide a powerful mechanism for creating server-side programs. The servlets are available in a design for many protocols. Servlet is also platform-independent and server-independent. The most commonly used protocol for servlets is HTTP. A servlet is also a pure Java object.
Q7. What are the different phases of the Servlet life cycle?
Answer:
The different phases of the servlet life cycle are:
- Class loading phase: web container is used to load the servlet class files (*.class)
- Instantiation phase: The default no-arg constructor is called, and the servlet class gets instantiated.
- Initialization phase: The servlet calls the init() method only once during its lifetime. Developers generally assign servlet configuration to the servlet during this phase.
- Request handling phase: This is the phase where the servlets spend the maximum time. Servlets provide the services to various requests by calling the service ().
- Removal phase: The destroy () method is used to invoke servlet destruction. Garbage collection occurs later.
Let us move on to the following J2EE Interview Questions.
Q8. What are the different types of JSP tags?
Answer:
There are four different types of JSP tags:
- Directives – Provide instructions to the JSP container about page settings, imports, or included files.
- Declarations – Declare variables and methods that become part of the generated servlet class.
- Expressions – Display the value of a Java expression directly in the browser output.
- Scriptlets (Scripts) – Contain Java code that executes each time the JSP page processes a request.
Q9. Explain the basic and subtypes of EJBs?
Answer:
These are advanced J2EE interview questions. Two main types and subtypes of EJBs are:
—Session Beans:
- Stateful session beans: Maintain client-specific data across multiple requests during a session.
- Stateless session beans: Do not store client data and treat every request independently.
–Entity Beans:
- Bean-managed persistence: The bean manages database operations using custom code.
- Container-Managed Persistence: The EJB container automatically handles database persistence
- Message-driven beans: process asynchronous messages from messaging systems such as JMS without direct client interaction.
Q10. What is the JSP directive?
Answer:
It is a mechanism for providing metadata to a web container about a JSP file. Different types of JSP directives are:
- Page directive
- Include directive
- Taglib directive
Q11. What is the difference between J2EE, Java EE, and Jakarta EE?
Answer:
J2EE (Java 2 Enterprise Edition) was the original enterprise platform introduced by Sun Microsystems. It later became Java EE after several updates. Today, the platform is known as Jakarta EE and is managed by the Eclipse Foundation. Jakarta EE uses the jakarta.* package namespace instead of javax.* and provides APIs for building secure, scalable, and cloud-native enterprise applications.
Interview Tip: Mention the migration from javax.* to jakarta.*.
Q12. What is Dependency Injection (DI)?
Answer:
Dependency Injection is a design pattern in which the Spring container creates and injects required objects into a class, rather than the class creating them itself. This reduces coupling, improves code maintainability, and simplifies unit testing.
Example
Instead of using:
</>Java
Student student = new Student();
Spring automatically injects the object using:
</>Java
@Autowired Student student;
Q13. What is the difference between Hibernate and JPA?
Answer:
JPA (Java Persistence API) is a specification that defines standard ORM features. Hibernate is the most popular implementation of JPA and provides additional features such as caching, lazy loading, and advanced query support.
| JPA | Hibernate |
| Specification | Framework |
| Standard API | JPA implementation |
| Vendor-independent | Includes extra features |
Q14. Why are companies moving from traditional J2EE applications to Spring Boot and Microservices?
Answer:
Companies are moving to Spring Boot and Microservices because they make application development faster and easier. Spring Boot reduces manual configuration, while Microservices allow developers to build, update, and deploy different parts of an application independently. These technologies also support cloud platforms, improve scalability, simplify maintenance, and help businesses release new features more quickly.
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