The Resources Plugin handles the copying of project resources to the output directory. There are two different kinds of resources: main resources and test resources. The difference is that the main resources are the resources associated with the main source code while the test resources are associated with the test source code. Thus, this allows the separation of resources for the main source code and its unit tests.

Apache HttpComponents Client

Apache Ant is a Java library and command-line tool whose mission is to drive processes described in build files as targets and extension points dependent upon each other. The main known usage of Ant is the build of Java applications.

A plugin for Apache Maven that runs Apache RAT to audit the source to be distributed.

Compiler for the Scala Programming Language

Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard

A Maven plugin for the PMD toolkit, that produces a report on both code rule violations and detected copy and paste fragments, as well as being able to fail the build based on these metrics.

Maven 2 plugin to check and update license headers in source files

ZooKeeper server

Apache Commons Net library contains a collection of network utilities and protocol implementations. Supported protocols include Echo, Finger, FTP, NNTP, NTP, POP3(S), SMTP(S), Telnet, and Whois.

The Vert.x core APIs contain the backbone for writing Vert.x applications and low-level support for HTTP, TCP, UDP, file system, asynchronous streams and many other building blocks.