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Guava is a suite of core and expanded libraries that include utility classes, Google's collections, I/O classes, and much more.
Last Release on Sep 17, 2025
Legacy version of Log4J logging framework. Log4J 1 has reached its end of life and is no longer officially supported. It is recommended to migrate to Log4J 2.
Last Release on May 26, 2012

ScalaTest is a flexible and popular testing tool in the Scala ecosystem. It can be used to test Scala, Scala.js, Scala Native, Dotty (Scala 3), and Java code.
Last Release on Jun 23, 2024
Add-on module to support JSR-310 (Java 8 Date & Time API) data types.
Last Release on Oct 31, 2025

JSON is a light-weight, language independent, data interchange format. See http://www.JSON.org/ The files in this package implement JSON encoders/decoders in Java. It also includes the capability to convert between JSON and XML, HTTP headers, Cookies, and CDL. This is a reference implementation. There are a large number of JSON packages in Java. Perhaps someday the Java community will standardize on one. Until then, choose carefully.
Last Release on May 17, 2025
YAML 1.1 parser and emitter for Java
Last Release on Aug 31, 2025
Javassist (JAVA programming ASSISTant) makes Java bytecode manipulation simple. It is a class library for editing bytecodes in Java.
Last Release on Dec 24, 2023
Add-on module for Jackson (https://github.com/FasterXML/jackson) to support JDK 8 data types.
Last Release on Oct 31, 2025
Add-on module for Jackson (https://github.com/FasterXML/jackson/) to support Kotlin language, specifically introspection of method/constructor parameter names, without having to add explicit property name annotation.
Last Release on Oct 31, 2025

HikariCP is a 'zero-overhead' production ready JDBC connection pool.
Last Release on Sep 12, 2025