A typical Java project relies on third-party libraries. This article summarizes the most popular and widely used Java libraries for a variety of different applications. A simple example is also provided for some of them, if it can be found on ProgramCreek.
Java SDK is surely the #1 widely used library. So the focus of this list is the popular third-party libraries. The list may not not perfect, so leave your comment if you think others should be included.
Apache Commons Lang – Apache’s library that provides a host of helper utilities for the java.lang API, such as String manipulation, object creation, etc.
Google Guava – Google’s Core library for collections, caching, primitives support, etc. (example)
2. HTML, XML Parser
3. Web Frameworks
Spring – an open source application framework and inversion of control container for the Java platform. (example)
Struts 2 – most popular web framework from Apache. (example)
Google Web Toolkit – a development toolkit from Google for building and optimizing complex browser-based applications. (example)
Strips – a presentation framework for building web applications using the latest Java technologies.
Tapestry – component oriented framework for creating dynamic, robust, highly scalable web applications in Java.
Here is a comparison of those frameworks.
4. Chart, Report, Graph
JFreeChart – creates charts such as bar charts, line charts, pie charts, etc.
JFreeReport – creates PDF reports.
JGraphT – create graph that contains a set of nodes connected by edges.
5. Windowing Libraries
6. GUI Frameworks
Eclipse RCP. (example)
7. Natural Language Processing
If you are an expert of NLP, here are more tools.
8. Static Analysis
Jackson – a multi-purpose Java library for processing JSON data format. Jackson aims to be the best possible combination of fast, correct, lightweight, and ergonomic for developers.
XStream – a simple library to serialize objects to XML and back again.
Google Gson – a Java library that can be used to convert Java Objects into their JSON representation. (example)
JSON-lib – a java library for transforming beans, maps, collections, java arrays and XML to JSON and back again to beans and DynaBeans.
Apache Commons Math – provide functions for math and statistics.
Apache Log4j – most popular logging library. (example)
Logback – a successor to the popular log4j project.
The Simple Logging Facade for Java (SLF4J) – a simple facade or abstraction for various logging frameworks (e.g. java.util.logging, logback, log4j) allowing the end user to plug in the desired logging framework at deployment time.
Apache POI – APIs for manipulating various file formats based upon Microsoft’s OLE 2 Compound Document format using pure Java.
Docx4j – a Java library for creating and manipulating Microsoft Open XML (Word docx, Powerpoint pptx, and Excel xlsx) files.
— More from comments —
13. Date and Time
Joda-Time – a quality replacement for the Java date and time classes.
- Hibernate / EclipseLink / JPA
- SpringJDBC / Spring Data
- Apache DbUtils
Lambok – a Java library meant to simplify the development of Java code writing
* 1) The list above are based on my own survey combined with personal experience. It is possible that they are not precisely THE MOST popular, but at least well-known.
* 2) I will keep updating this list to make it more complete and accurate. Thanks for your comments.