Containerization is like putting a Java program and all it needs into a special box. This ensures the application runs the same, regardless of where the container is deployed meaning that you can package or integrate. Basically it is like the program works the same no matter where you use the box. JPA is a set of rules or guidelines that describe how Java objects should be stored, updated, deleted, and retrieved from relational databases. It standardised the way, Java applications interact with databases using ORM (Object-Relational Mapping).

what every java developer should know

For instance, the developer should know what are the most common errors that create a memory leak. Also, the developer has to know about what is the best moment to implement different kinds of software patterns. Creating a great user experience is the key to developers, and that is lost on many back-end or infrastructure coders. UX and other front-end focused coders are a little better, but still, lack this ability.

How to Become a Java Developer

But knowing more than one programming language can affect your salary bracket. The employers often prefer developers who are familiar with C#, JavaScript, Python and Ruby among others. The intent is to show the employers that your talent can be used across multiple projects. Java knowledge from university is hardly ever useful for business coding. So unless you recruit for an entry, junior position you can skip assessing Java skills based solely on university education and degree. In that case what is more important is candidate’s real life coding projects, it doesn’t have to be a commercial one – it can be hobby or open source programming project.

There are numerous reasons why Java is so popular and why it is used in so many commercial applications. Alyssa Langelier is a career advisor at Coding Dojo, a premier coding school and the only boot camp to teach three full technology stacks in a single 14-week program. Alyssa has over 11 years of experience in the software engineering field, and currently, leads Clara Lending ‘s Data Engineering team.

My favorite courses to learn Software Architecture in 2023— Best of Lot

If you are just starting your journey to becoming a Java developer, you can learn Java on Codegym, a practical online course that comes with over 1000 exercises and a friendly community. And if you have experience in Java programming, it is always a good idea to revise the basics, which Codegym is also great for. Of course, there are numerous other learning resources you can try. Just stick to the ones that focus on practice rather than theory only. Quarkus is backed by Redhat and it’s quickly gaining ground for creating high-performance, and scalable Java applications.

  • JSON processing APIs like Jackson and Gson, XML processing APIs like JAXB and Xerces, and unit testing libraries like Mockito and JUnit.
  • The most common skill I’ve seen in successful developers is having the ability to quickly write code, run, analyze, debug, recode, and restart on problems.
  • As many larger companies hire specifically to manage testing, cybersecurity, and vendor management, some Java developers have specialized roles.
  • They not only know more tools than an average developer, but they also know their tools well.
  • Also, I have ranked these skills based upon my experience and preferneces and imporantce for Java developers.

If you want to learn further, I suggest you check this list of best JUnit and Mockito courses from Udemy and Pluralsight. I strongly suggest every Java developer to learn Docker to try new things and add this useful skill to your resume. See this list of best SOA courses, If you want to learn more about SOA and get this how to become a java developer skill. The basic principles of service-oriented architecture are independent of vendors, products, and technologies. It sounds very similar to microservice, where also the application is divided into multiple services, but the key difference is size, microservice, as the name suggests, is much smaller in size and scope.

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