Top 25 Java Architect Interview Questions and Answers in 2024

Java’s history is fascinating. Although Java was intended for interactive television, the cable television industry could not use it due to its advanced technology. The Green Team is where Java’s history began. This project was started by members of the Java team (also known as the Green Team) to create a language for digital devices like set-top boxes, televisions, etc. However, internet programming was where it excelled. 

Java architecture is a component of Java programming due to its integration of the interpretation and compilation processes. It outlines each step needed to write a Java program. The entire process of compiling and running a program is described in detail in Java Architecture.

The main duties of a Java architect include designing, enhancing, and integrating Java applications. This entails his recommendations and reviews of design strategies and plans during the design phase and his assistance in resolving design or network problems during the development, integration, or release. So how can you ensure that the interviewer gets the right impression from your responses? We examine some model responses and suggestions for you.

1. What Skills Are Necessary To Become A Java Architect?

The applicant must have prior experience creating budgets, planning expenses, identifying variations, and carrying out changes mandated by organizational needs.

Concurrency, Threads, API and web services, Java Server Pages, Servlets, Java Server Faces, EJB, Java Persistence API, JAX-RS, JAX-WS, JNDI, and applications, web servers, are just a few of the features one should be fully knowledgeable about.  He/She ought to have practical experience using different design patterns for Java applications and successfully creating practical, scalable answers to business problems.

2. What Does A Java Architect Do? 

An expert in software development who creates software architecture for Java-based applications is known as a Java architect. The object-oriented programming language Java is compatible with a wide range of computer systems and software. Java architects typically create the application’s software architecture for businesses to aid in problem-solving. Investigate technical problems and design flaws. They work with other departments to address the organization’s needs and objectives.

3. What Added Value Did You Bring To Your Previous Position?

I was able to contribute in several ways in my previous role. I was a highly reliable employee with a positive attitude and above-average organizational abilities. My work history includes a lot of successful project management. I am currently working for a company that does not have efficient project execution but, with my skills, I can raise the performance in that area.

4. What Distinctions Exist Between JDBC And Hibernate?

According to my anecdotes, architectural disparities between JDBC and Hibernate affect usage. One of the key distinctions is that Hibernation is an object-relational mapping (ORM) tool, whereas JDBC lacks an ORM mechanism.

Another notable distinction is that the programming language used by JDBC, Structured Query Language, differs significantly from Hibernate Query Language in terms of functionality. Hibernate is more expandable than JDBC in terms of scalability.

5. How Do You Resolve A Disagreement With A Coworker Regarding How You Use A Java System? 

I would exemplify to my coworker that I value their input by using my active listening skills to comprehend how my use of the Java system has caused them to disagree. After that, I would analyze my usage to see if there were any issues that I might have overlooked during my procedure.

I would use my work-related Java experience, online Java resources, and the Oracle support system to see if there are any ways I could use Java more effectively.

I would brief my boss and seek guidance on how to handle the circumstance. Once I have the necessary information, I will make the decision and then professionally and diplomatically inform my coworker of my choice.

6. How Would You Respond On The Occasion That You Were Given Unfamiliar Information Or A Task To Complete? 

At work, I gladly accept the unfamiliar because it gives me the chance to develop professionally. To better assess my level of understanding when I first start receiving something like this, I frequently begin by asking pertinent questions about the task or project. Afterward, depending on the situation and my level of ignorance, I might conduct my independent research. However, if it is particularly complicated or if my comprehension is only limited, I would ask a supervisor or colleague for advice. At work, I have a lot to learn from my colleagues, so whenever I get the chance to grow professionally in that way, I always take it. I am eager to apply this same mentality to my work with your company.

7. What Distinguishes A Java Architect From A Java Developer?

A Java architect is a developer with extensive experience in Java developer who is skilled in the use of design patterns and UML modeling tools. A Java developer is a person who develops software or applications using Java technology. As a Java architect, it is my job to use Java technology to develop Java-based solutions to business problems. In my previous position, I frequently worked alongside a Java developer to show them how to integrate Java into their projects.

8. How Would You Improve A Java Application That Connects To A Database?

I need to know how to debug the various problems when managing enterprise architecture as a Java architect. If I’m using ORM, I’d assess my ORM strategy, tweak the database caching, and make necessary changes. Another approach I would employ to strengthen the connection is to optimize the query, which I could do by rewriting the query if necessary. I would also redesign the indexes.

9. What Is Message-Driven Design, And What Are Some Of Its Benefits?

As per my knowledge, message-driven architecture aims to link distributed systems using standardized message-oriented middleware to convey messages from one module to another. It is advantageous in many ways as:

It is non-blocking and asynchronous.

It is possible to immediately release system resources without waiting for a response. 

It reduces contention and raises the possibility of more scalability.

Can send messages if the intended recipient is available.

10. Any Organization Must Expect Change. Have You Ever Had To Adjust To Change?

The tech organization was restructured in my previous position at a high-growth tech startup, from a new manager to new teams and territories. Once another project manager was given some of the projects I had been fostering but had not yet converted, but he was rewarded for my hard work. Naturally, this can be very frustrating, but by talking with management and learning the “why” behind the change, I was able to recognize the bigger goal. In the end, I exerted more effort and improved my sales performance.

11. How Have You Proven That You Are Willing To Put In A Lot Of Effort In Your Current Position? 

My company is in the process of becoming certified to process card payments, so I have to be extra careful when hiring new contractors. Ensuring they have demonstrated experience to deliver during the due diligence process is essential. This entails spending more time on phone calls with their previous clients to better understand their relationships with those vendors. Speaking with subject-matter experts to close any knowledge gaps during knowledge-learning sessions. These extra measures ensure I’m selecting the best course of action for the company or organization. 

12.  How Do You Design A Scalable Architecture For A Project? 

Scalability is the main concern for Java architects. I design a scalable architecture taking into account the project’s anticipated growth. I designed an architecture capable of handling increased data and traffic without stuttering or collapsing. I consider the following factors when developing a scalable architecture. 

Make use of scalable components: Select elements that can be expanded either horizontally or vertically by including more instances (by adding more resources to a single instance).

Creating a Failure: While creating a building, I think about all potential outcomes and use redundancy and fail-over mechanisms.

Always keep an eye on performance to identify bottlenecks and other potential issues.

13. Describe The Single Responsibility Principle (SRP) In Detail.

According to the Single Responsibility Principle (SRP), each class should only have one duty and one goal. This suggests that a class will only complete one task, so there should be only one justification for change.

With this, your software’s implementation is made simpler, and it offers protection from the unanticipated effects of upcoming changes.

14. How Can A Database Deadlock Be Avoided? 

A database deadlock happens when too many resources attempt to open its locks at once. I would create a queue to validate each application before submitting it to the database to prevent the database from entering a cyclic wait stage. Using fewer cursors to prevent locking the tables is another way to get around this problem. Another method to prevent a database deadlock is to use a small transaction.

15. Have You Ever Heard Of The “Permanent Generation”? 

Yes, I am aware of PermGen as I’m a Java architect. It is a memory pool containing all reflective data reflective to the Java Virtual Machine, such as class and method object? This generation of Java virtual machines is split into read-only and read-write regions. The metadata required by the JVM to define the classes and methods used by the application is contained in Permanent Generation. The JVM populates the permanent generation based on classes used by the application at runtime. Additionally, this is where the Java SE library’s classes and methods can be stored.

16.  What Exactly Is Sharding, And Is It Useful?

The architectural strategy of sharding entails splitting up a database’s tables and storing them on different machines, or shards, which act as separate databases. The use of this strategy is advantageous. In my opinion, increased scalability is the most significant advantage. For instance, as the tables are split up and the data is stored separately, sharding reduces the number of rows in each table, thereby reducing the size of the index and enhancing search performance. By adding or removing shards, I can scale a Java application up or down. To lower the possibility of failure, I replicate the data using shards. Because each shard is small, I also use this method to make cloud deployment simpler. Additionally, to increase data proximity, it is possible to use sharding to distribute different portions of the same dataset.

17. How Many Employees Did You Manage At Your Previous Job? 

My most recent two projects, which I managed remotely, included a team of 17 carefully chosen people. I took care to select people who could communicate clearly and work independently. They needed very little supervision once I got everyone on the same page. I didn’t interfere with their performance other than through brief check-ins, once-week sprint planning, and goal setting. While enjoying the process, I ensured all the objectives were met, nothing slipped through the cracks, and no one encountered any difficulties. Both times, we exceeded expectations by delivering well ahead of schedule. 

18. What Benefits Does JDBC Have Over Hibernate? 

I can trust Hibernate to automatically update all the queries after changing the database because it uses the object-oriented Hibernate Query Language (HQL). If I use JDBC, each query must be manually updated whenever the database is changed because JDBC uses the non-object-oriented Structured Query Language or SQL. JDBC is more challenging to use than Hibernate due to this architectural difference, and there is a higher risk of errors.

Due to the HQL features, Hibernate provides me with more features compared to the JDBC. While SQL only supports SQL, HQL supports both HQL and SQL, allowing me to work with multiple databases. Hibernate, as opposed to JDBC, makes database migration simpler. Since Hibernate has a caching feature, it performs faster than JDBC. I have to write extra code when using JDBC because there is no caching system.

19. Can You Differentiate Between Monolithic, SOA, And Microservices Architecture As Per Your Experience?

According to my experience, the LTS version aims to finish the preview capabilities so they remain reliable and appealing for the next three years.

In a monolithic architecture, software components of the application are constructed together and tightly wrapped inside a big container.

A collection of services that communicate with one another is service-oriented architecture. Simple data transmission or the coordination of such activities by two or more services are examples of communication.

An architectural style called microservice architecture creates applications as a group of minute, self-reliant services based on a business domain.

20.  How Can A Database Be Migrated?

Two tools that aid in managing, tracking, and deployment of database schema changes are Liquibase and Flyway. They are both migration-based technologies that, by treating database code like app code and automating it, seek to close a gap in many teams’ workflows.

21.  What Does The Term Solid Mean?

We can handle the majority of software design issues by using object-oriented SOLID principles. SOLID stands for five design principles that work to improve the readability, adaptability, and maintainability of software designs.

The SOLID principle is an idea that Robert C. Martin developed.

These five guidelines have improved both the idea of object-oriented programming and the process of creating software.

SOLID is an abbreviation for the Single Responsibility Principle (SRP)

Open-Closed Theory (OCP)

The Principle of Liskov Substitution (LSP)

The Principle of Interface Segregation (ISP)

The Principle of Dependency Inversion (DIP)

22.  Do You Know Which Files Are In The JDK?

 The file structure of JDK and JRE includes

ext. fonts, security, rt.jar, sparc. server.client, bin. java* localedata.jar, lib. applet, Charsets.jar, and ext. 

23.  The CQRS Design Pattern: What Is It?

A microservices design pattern called CQRS (Command Query Responsibility Segregation) separates reading and writing into two models. A command that executes an action or a Query that returns data should be the only two types of method. Through the use of commands for data updating and queries for data reading, CQRS separates reads and writes into separate models.

To handle POST, PUT, PATCH, DELETE – (WRITE) operations command is used, while a query is used for handling GET – (READ) operations, as indicated by the name Command Query Responsibility Segregation. 

24.  How Do You Respond When You’re Not Happy With The Standard Or Result Of Your Work?

I’m being compassionate and sincere, I always analyze where I went wrong, inform the people I am affected, and make a concerted effort to either waste or recreate what I’ve done or improve upon what is already in existence. My management philosophy is based on trust, which enables me to bring my entire self to work and thereby produce my best work while fostering close relationships.

25.  What Practices Do You Enjoy On The Weekends?

I’m a creative person who likes to read, take pictures with my digital camera, and take self-improvement classes in my spare time. By following online training tutorials and reading books, I taught myself to take photos of a professional caliber. When I am learning something new and have the discipline to sit down, put the work in, and learn, that is when I am happiest. I also like to read because it helps me unwind and transports me to a different setting. I find that reading inspires my best writing. I find that using my imagination and creative thinking is helpful. 


Java architects are constantly in demand in the IT sector because they can design, improve, and integrate Java applications. As you prepare for the interview, look over the job description for any accountabilities or skills that might be covered. Utilize the above questions and answers to your advantage by adapting your responses to the needs of the employer and your qualifications.

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