Java is a programming language and computing platform first released by Sun Microsystems in 1995. It is considered one of the most popular programming languages in the world. Here are a few amazing facts about the Java Language:

  • Nearly 9 out of every 10 computers in the US run Java.
  • There are 9 million Java developers worldwide.
  • 3 Billion devices run Java.
  • 1 Billion Java Downloads per Year

We,at, have analyzed thousands of job posts for Java developer position to identify the most popular technical skills employers are looking for. Here is the full list (you can click on the links to get more information on each skill):

  • Java
  • Spring test your Spring Framework skills-
  • SQL Test your SQL skills-
  • Hibernate
  • Web Services
  • JavaScript Test your JavaScript skills-

Here are recommended steps to start learning Java and become a Java developer:

Trying to Learn Java on your own.

1. Learn important skills

  Apps-File-Java-icon1.1 Java

Java is a computer programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few implementation dependencies as possible.

Start with learning Java. Here are 2 free introductory courses to begin with:

Provider: Udemy      Price: Free

Provider: MIT Open Courseware     Price: Free

Paid resources:

Provider: Treehouse    Price:  $25/mo

This is a recommended track that will teach you the Java basics and will take you through simple exercises.

Provider: Udemy    Price: $59

Test your Java Level


spring-framework-project-logo   1.2 Spring Framework

The Spring Framework is an open source application framework and inversion of control container for the Java platform. The framework’s core features can be used by any Java application, but there are extensions for building web applications on top of the Java EE platform. Once you have acquired a basic knowledge in Java, your next step is to learn the Spring framework, one of the most popular frameworks for Java.

Free resources:

Provider: Java Brains    Price: Free

Paid resources:

Provider: Udemy      Price: $39

Test your PHP Level

  database-icons-screenshots-21.3 SQL

SQL (Structured Query Language) is a special-purpose programming language designed for managing data held in a relational database management system (RDBMS), or for stream processing in a relational data stream management system (RDSMS). (Very technical, maybe more explaining of what sql is)

Free resources:

Provider: Code School        Price: Free

Provider: W3Schools          Price: Free

Test your SQL skills


 hibernate 1.4 Hibernate

Hibernate ORM (Hibernate for short) is an object-relational mapping library for the Java language, providing a framework for mapping an object-oriented domain model to a traditional relational database. Hibernate solves object-relational impedance mismatch problems by replacing direct persistence-related database accesses with high-level object handling functions.

Paid resources:

Provider: Pluralsight         Price: $29/mo

Provider: Pluralsight         Price: $29/mo


service  1.5 Web Service

A Web service is a method of communication between two electronic devices over a network. It is a software function provided at a network address over the Web with the service always on as in the concept of utility computing.

Free resources:

Provider: Udemy               Price: Free

Paid resources:

Provider: Pluralsight        Price: $29

Provider: Udemy                 Price: $49

Apps-File-Javascript-icon  1.6 JavaScript

JavaScript is a dynamic computer programming language. It is most commonly used as part of web browsers, whose implementations allow client-side scripts to interact with the user, control the browser, communicate asynchronously, and alter the document content that is displayed. It is also used in server-side network programming with frameworks such as Node.js, game development and the creation of desktop and mobile applications.

Free resources:

Provider: Codecademy         Price: Free

Provider: Udemy              Price: Free

Paid resources:

Provider: Udemy              Price: $9

Provider: Pluralsight          Price: $29

Take a JavaScript test


2. Practice your Java skills

Gain hands-on practice to master you Java coding skills. A good place to start is CodeWars.

3. Test your Java

Your next step is to put your coding skills to test. Smarterer allows you to test your Java coding skills:

Test the essential skills at ReSkill:

SQL test 

JavaScript test

4. Get help

Here is a great Q&A forum to get answers for your questions:

5. Attend professional meetups

A great way to acquire new skills and to grow your professional network is to attend meetups.

Become a Java expert. Start here.

About The Author


Co-Founder and CEO at ReSkill