Adding Functionality to Apache NiFi
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The intent of this Developer Guide is to provide the reader with the information needed to understand how Apache NiFi extensions are developed and help to explain the thought process behind developing the components. It provides an introduction to and explanation of the API that is used to develop extensions. It does not, however, go into great detail about each of the methods in the API, as this guide is intended to supplement the JavaDocs of the API rather than replace them. This guide also assumes that the reader is familiar with Java 7 and Apache Maven.

This guide is written by developers for developers. It is expected that before reading this guide, you have a basic understanding of NiFi and the concepts of dataflow. If not, please see the Apache NiFi Overview and the How To documentation to familiarize yourself with the concepts of NiFi.