![]() It really makes testing setup easier than ever before, particularly for testing spring boot applications. without a dependency on a local installation If you are wondering why do we use Testcontainers or why do we need it then let me tell you that Testcontainers will allow us to write integration tests making use of containerized databases, message queues, web browsers, etc. If you don’t know, Tescontainer is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container. This is another awesome Java library that every Java developer should learn in 2022. It’s a great, hands-on course to learn these useful libraries. If you want to learn JUnit and Mockito and you need a resource, I highly recommend Learn Java Unit Testing with Junit & Mockito in 30 Steps by Ranga Karnam on Udemy. I always have a goal to improve my knowledge of unit testing and integration testing libraries, like JUnit 5, Cucumber, Robot framework, and a few others. Programmers often are given excuses for not writing unit tests, but the most common excuse for avoiding unit testing is lack of experience and knowledge of popular unit testing libraries, including JUnit, Mockito, and PowerMock. Unit testing is the single most important thing that separates an average developer from a good developer. ![]() If you have an idea then you can research that library and use it. In order to use these libraries, Java developers should be familiar with them, and this is the whole point of this article. Here is my collection of some of the useful third-party libraries Java developers can use in their applications to do a lot of useful tasks. 20 Essential Libraries and APIs for Java Programmers in 2022 If you have faced them before then you know how painful they are to solve. If you have the wrong versions of the JAR, then, you will get the ClassNotFoundException, NoClassDefFoundError, or the UnsupportedClassVersionError in Java. You might not realize, but having the right version of dependent JARs is a big headache. When you use Maven for dependency management, it will automatically download these libraries, including the libraries they depend on, known as the transitive dependency.įor example, if you download the Spring Framework, it will also download all other JARs on which Spring is dependent, for example, Log4j. If you need to use them in your project, then, you can either include JARs of these libraries in your project’s classpath to start using them or you can use Maven for dependency management. In general, I am including useful libraries for day-to-day projects, including logging libraries like Log4j, JSON parsing libraries like Jackson, and unit testing APIs like JUnit and Mockito. However, I am not including frameworks, Spring and Hibernate, because they are pretty well known and have specific features. In this article, I am going to share some of the most useful and essential libraries and APIs that a Java developer should be familiar with. That advice made sense to me because of the testing exposure 2nd-party libraries get. I spent a good deal of time learning API, especially after reading Effective Java 3rd Edition, where Joshua Bloch advised how to use existing APIs for development rather than writing new pieces of code for common stuff. One of the traits of a good and experienced Java developer is the extensive knowledge of API, including JDK and third-party libraries. Hello Java programmers, if you are looking for the most essential Java libraries to learn and become a more competent Java developer in 2022 then you have come to the right place.Įarlier, I have shared essential Java Frameworks and the best courses to learn Spring Boot, one of the most popular Java frameworks and in this article, I am going to share the most popular and useful Java libraries you can learn to become a better Java programmer in 2022.
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