Guava is a suite of core and expanded libraries that include

Apache Commons Validator provides the building blocks for both client-side and server-side data validation.

JSON is a light-weight, language independent, data interchange format.

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

EqualsVerifier can be used in JUnit unit tests to verify whether the contract for the equals and hashCode methods is ...

Mockito mock objects library core API and implementation

Better parameterised tests for JUnit