This is a minimal Maven project implementing an ImageJ 1.x plugin
It is intended as an ideal starting point to develop new ImageJ 1.x plugins in an IDE of your choice. You can even collaborate with developers using a different IDE than you.
In Eclipse, for example, it is as simple as File>Import...>Existing Maven Project
In Netbeans, it is even simpler: File>Open Project. The same works in IntelliJ.
If jEdit is your preferred IDE, you will need the Maven Plugin.
Die-hard command-line developers can use Maven directly by calling mvn in the project root.
However you build the project, in the end you will have the .jar file in the target/ subdirectory. Simply copy it into your ImageJ's plugins/ directory, run Help>Refresh Menus and the plugin will be available in Process>Process Pixels (this can be changed by editing src/main/resources/plugins.config).
Developing plugins in an IDE is convenient, especially for debugging. To that end, the plugin contains a main() method which sets the plugins.dir system property (so that the plugin is added to the Plugins menu), starts ImageJ, loads an image and runs the plugin.
Since this project is intended as a starting point for your own developments, it is in the public domain.