The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.

Mule server and core classes

Mule Builder for use with Spring 4.3.x Namespace based XML configuration.

Basic building block for Spring that in conjunction with Spring Beans provides dependency injection and IoC features.

QDox is a high speed, small footprint parser for extracting class/interface/method definitions from source files

JUnit Jupiter is the API for writing tests using JUnit 5.

Mockito mock objects library core API and implementation

Basic building block for Spring that in conjunction with Spring Beans provides dependency injection and IoC features.