Top 10 Java Libraries for 2023
02 Mar

Top 10 Java Libraries You Should Know About in 2023

Mahipal Nehra

Top 10 Best Java Libraries in 2023. Since its release, Java has remained one of the universal languages. It is a high-level, general-purpose, object-oriented, multi-paradigm programming language designed to have fewer implementations.

One of the key features behind the popularity of Java is its rich and vast list of libraries - a collection of related functionalities or modules already written by somebody else that can be added to Java code to solve problems at hand and ease the development process.

While there are numerous Java libraries to use in the code, we have curated a list of the top 10 Java libraries that you should know about.

So, without further ado, let’s get started!

List of Top 10 Java Libraries for 2023

To help you, here is the list of the top 10 Java libraries worth knowing about in 2023.

  1. Java Standard Libraries

  2. Apache Commons

  3. Jackson

  4. Google Guava

  5. JUnit

  6. Log5j

  7. SLF4J

  8. Mockito

  9. JAXB

  10. AssertJ

A Java library is a collection of pre-written code that developers can reuse to perform common programming tasks and build complex applications quickly. And as a developer, you must know how using Java libraries can reduce iteration while saving development time.

Now let’s look at each library in detail to understand its purpose.

Java Standard Libraries

These built-in libraries of Java are often overlooked but provide some robust functionalities.util, Java.math, Java.lang,, and are some Java Standard libraries that help beginners solidify their concepts. Java Standard Libraries are called at runtime by Java Virtual Machine.

Apache Commons

It is one of the most popular, general-purpose, fully-featured utility-classes packages that extend the Java API’s functionalities. It comprises 43 modular libraries covering Java classes, I/O utilities, Mathematics & Statistics, Logging, JDBC helper, and Java Collections framework extension. Its rich abilities include reflection, concurrency, string, array, or number manipulation, and data structure implementations.


Jackson is yet another efficient and popular Java library that helps to map Java objects to JSON and the other way around. It is fast with a low memory footprint, making it ideal for serializing large object systems. Jackson provides three methods to process JSON files, i.e., Streaming API, Data Binding, and Tree Model. Jackson is a data-processing Java library that supports JSON, CSV, YAML, XML, Avro, BSON, CBR, and Protobuf.

Google Guava

Like Apache Commons, Google Guava consists of independent modules like utilities, collections, string manipulation, and concurrency for Java. Some primary features of Google Guava are Java Collections Framework augmentation, Caching, I/O utilities, graph libraries, Bitmaps, and Caching.


With JUnit, developers can create test cases to run unit tests to identify and fix code bugs. Unit testing is performed to validate the relation and behavior of a small application unit separately from the complete application. In addition, it allows developers to work on the Test Driven Development module for creating a tested application.

Top 10 Java Libraries


A modern facade of the most popularly used logging framework Log4j. It is among the fastest and most lightweight Java logging libraries. Log5j offers methods like errorf, logf, debugf, and tracef, allowing dynamic logging method formatting, efficient when there are no logged messages.


It is a straightforward abstraction for logging different frameworks to connect the right logging deployment time. Some of the basic features of SLF4J are fundamental logging system abstraction, logging framework modification, and event logger for event recording.


It is the most widely used Java mocking library that can be used to mock the behavior of other classes in a small or complex Java application. Your Unit/Integration testing process is kept simple, clean, and straightforward with its simple API. Furthermore, it supports annotation-based mocks and spy injections.


XML is another data format used in Java for storing, validating, and transporting data. The JAXB library annotations help Java programmers to bind, validate, and support mapping XML schema features.


AssertJ is another library for tests. Testing involves verifying whether the test result corresponds to what was expected. It is used to enhance the readability of the test code. AssertJ offers some static methods for the data structure. Some of the core features of AssertJ are fluent assertion for better code readability, core modules for Java libraries, SQL databases, etc.


So, these were the top Java libraries you can use to enhance the development process of a project. It helps developers integrate pre-written code modules that save time and effort and to improve productivity, code consistency, and code reusability.

Read: Programming Languages, Tools & Technologies for Desktop App Development in 2023

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What are Java Libraries?

Java libraries refer to a collection of pre-written code that developers can reuse to perform common programming tasks and build complex applications efficiently.

Are Java libraries free to use?

Many Java libraries are open-source and free, but some may require a license fee or subscription.

What are different Java libraries?

Java Standard Libraries Jackson, Apache Commons, Google Guava, Maven, Log5j, JAXB, JRebel, and AssertJ are a few Java libraries in the market.

Posted by Mahipal Nehra | Posted at 02 Mar, 2023 Web