Getting started with Jenkins plugin development is surprisingly easy. There is neat integration with Maven for building and testing a debug instance, and the build artifact can quickly be installed to an existing Jenkins instance.
Setting up the developer environment on a new system can be done through the following apt-get. However, on an older Debian (e.g. 8) or Ubuntu (~16 or older), you'd want to download Java JDK; Eclipse and Maven from their respective homes.
apt-get install openjdk-8-jdk eclipse-jdt maven
Starting from an existing plugin
Starting from an existing plugin is probably most straight forward, since a lot of the details are usually already in place. The "Test Results Analyzer Plugin" serves as a nice stand-alone example.
git clone https://github.com/jenkinsci/test-results-analyzer-plugin.git
To create an Eclipse workspace which later can be opened as an existing project in Eclipse:
mvn -DdownloadSources=true -DoutputDirectory=target/eclipse-classes -Declipse.workspace=~/test-results-analyzer-plugin eclipse:eclipse eclipse:configure-workspace
To build the .hpi file which can be installed through Jenkins:
For development and debugging, to create and launch a new Jenkins instance, which will have the new plugin installed.
Or, if you'd rather start from a clean plate, the following will create the skeleton structure.
mkdir foobar; cd foobar
mvn -U org.jenkins-ci.tools:maven-hpi-plugin:create
Once created, the commands above also apply, but you probably want to dive into the pom.xml file first, and define project information, dependencies.
For further details, see: