Java in their tech stacks

Java is a popular programming language that has been around for over 2 decades. The first release of this object-oriented programming language was launched way back in 1996, since then, it has been evolving incessantly as per the dynamic demands of businesses across industry verticals.

Today, Java is not only giving a tough competition to other programming languages but also many leading companies are using Java in their tech stacks including Uber, Airbnb, Google, Netflix, Pinterest, Instagram, Spotify, Amazon, Slack, and the list goes on. However, to become a better Java developer in 2021, it’s not just enough to have knowledge of this programming language. In fact, you need to ace in the top 4 skills that are discussed in this insightful piece. Let’s look at them. 

#1 Acquire Expertise In Java SE 8 to Java SE 16 Features 

First thing first – you need to acquire rich expertise in Java features starting from JDK 8 to JDK 15. The reason being is Java is evolving at a great pace and every 6 months, a new version of this programming language gets released. You would be astonished to know that there are many Java programmers out there who have over 8 years of experience under their belt and many of them are incapable of writing even a single line of code using Java 8 features such as Java Stream API or Lambda Expressions that are primarily used for bulk data operations. 

Having proficiency in Java 8 features and the above versions will not only give you an edge over other Java Developers out there but also increases your chances of getting hired by a java development company

#2 Polish Your Unit Testing Skills 

Do you know what is one thing that distinguishes seasoned Java developers from a mediocre programmer? It’s none other than advanced unit testing skill that is mostly found in seasoned developers. A seasoned Java developer writes unit tests for their code every time which helps them in validating code results when performing testing.

If you are a budding Java developer who wants to improve their unit testing skills, it’s wise to get your hands on the popular testing tools that are out there. Junit is one such popular tool for unit testing, you can try out the same to hone your testing skills. 

#3 Become a Pro in Spring Framework a.k.a Spring Boot

Another important skill that Java developers need to ace is the Spring framework. Today, many Java application development services providers are leveraging this framework such as Spring Cloud, Spring Boot, and Spring MVC for the development of REST APIs, robust web applications, and microservices. You will barely find a seasoned Java developer who is not making the most of the Spring framework. 

#4 Pay Attention to JVM Internals

If you want to become a seasoned Java developer, it’s strongly recommended to invest your time in understanding how Java Virtual Machine works, its different parts, how JVM executes JAVA bytecode along with JVM options, JVM system threads, JIT, collectors, and Garbage collection, etc.

Once you have a sound understanding of JVM, you won’t only understand Java better but can also solve complex problems during the development of high-performing web applications and REST APIs. Apart from this, it is also recommended to be aware of the JVM stack restrictions and cringe-worthy faux pas that many Java developers make. 


This article throws light on the top skills that every Java developer needs to ace in 2021. Once you acquire expertise in all these skills, you can easily gain a competitive advantage over thousands of Java developers out there who are still practicing old programming techniques. Hope you’ve found this piece relevant and insightful. If you do, you can share this article with other developers who are in your circle.

By Anurag Rathod

Anurag Rathod is an Editor of, who is passionate for app-based startup solutions and on-demand business ideas. He believes in spreading tech trends. He is an avid reader and loves thinking out of the box to promote new technologies.