Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang. The code is tested using the latest revision of the JDK for supported LTS releases: 8, 11, 17, 21 and 25 currently.

Implementation for Apache Log4J, a highly configurable logging tool that focuses on performance and low garbage generation. It has a plugin architecture that makes it extensible and supports asynchronous logging based on LMAX Disruptor.

API for Apache Log4J, a highly configurable logging tool that focuses on performance and low garbage generation. It has a plugin architecture that makes it extensible and supports asynchronous logging based on LMAX Disruptor.

The Apache Log4j SLF4J API binding to Log4j 2 Core

Fastjson is a JSON processor (JSON parser + JSON generator) written in Java

YAML 1.1 parser and emitter for Java

Apache HttpComponents Core (blocking I/O)

Core classes of Apache Maven to manage the building process.

Caffeine is a high performance, near optimal caching library. It provides an in-memory cache using a Google Guava inspired API.

Apache Hadoop Common

FreeMarker is a "template engine"; a generic tool to generate text output based on templates.