Developers Guide

This page explains how to create a patch, modify the core JOSM application or existing plugins.

At least basic Java programming skills are necessary. See WikiStart how you could improve JOSM without Java skills.

Source code and JOSM builds

• Installing and Running JOSM
• Source code#Getthesource
• Source code#CompilingusingAnt
• Compiling JOSM using IDE
  • How to create a JOSM build

Developer guidelines

• Development Guidelines (Coding style and Internationalization)
• Default Presets (about new osm-tags and icons in JOSM)
• Patch Guidelines (How to submit a patch)
• Track the state of development (Release Schedule)
• Releasing
• Releases

Eclipse

• Various Eclipse tips
• ​Video: how to checkout JOSM into Eclipse
• ​Video: how to checkout a JOSM plugin into Eclipse

JOSM core

• JavaDoc class documentation (for JOSM and JMapViewer)
• JavaBugs - you may encounter one of them

JOSM plugins

• Develop Plugins
  • Plugin publication steps
• Plugin installation without restart

SVN

• How to use your JOSM SVN account

JOSM Help System

• Context-sensitive help
• Current list of context-sensitive help topics

Shortcuts

• Current list of used shortcuts

Translation

• see Translations, Translations/Wiki and TaggingPresets#Translation

Developers

Dirk Stöcker is currently the lead maintainer of JOSM. Developers of JOSM with SVN commit privileges active in the past several months include:

Trac username	Name
akks	Alexei Kasatkin
bastiK	Paul Hartmann
Don-vip	Vincent Privat
Klumbumbus	Stefan Volke
michael2402	Michael Zangl
simon04	Simon Legner
stoecker	Dirk Stöcker
wiktorn	Wiktor Niesiobędzki

Immanuel Scholz was the original creator of JOSM, and previous maintainers include Frederik Ramm.

Previous developers include Frederik Ramm (framm) and Jiri Klement (jttt).

Many others have contributed through bug reports, patches, translations, and documentation work.