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Supplemental information for JOSM -- the Java OpenStreetMap Editor

I. Install & Launch

Installation notes
To run JOSM, you need:

* The JOSM .jar file, e.g., josm-tested.jar or josm-latest.jar
* Java Runtime Environment (JRE) 8, or later.

How to get Java Runtime Environment
You need JRE Version 8, or later.

Microsoft Windows and Apple Mac OS X users should visit
and download the latest Java executable for their system.

Linux users should visit
There is a Linux binary installer, which you must execute from a console, or
use the mechanism of your distribution's packaging system.

How to launch
Microsoft Windows users launch by double-clicking on the .jar file.
If this does not work, open a command shell and type
"java -jar josm-latest.jar" in the directory that holds the file. (Please
replace josm-latest.jar with the name of your .jar file, if you aren't using
the latest version.)

Under Linux, open a shell, go to the file directory and type
"java -jar josm-latest.jar" to launch. If this does not work, try to set
your JAVA_HOME variable to the java executable location (the root location,
not the bin).

macOS users just click on the .jar file icon.

II. Development

How to get the source code
Download it directly from the subversion at To use the command line subversion
client, type

svn co josm

Files & directories
This is an overview of the files and directories in the JOSM code repository:
- build.xml ant build file (standard way to create a JOSM binary)
- CONTRIBUTION list of major code contributors
- data/ data files that will be included in the JOSM jar file
- fonts/ font files used for map rendering
- gpx/ different color gradients for gpx drawing
- projection/ projection files
- custom-epsg list of projection definitions, auto-generated file created by ant task 'epsg'
- security/*.pem certificates that we like to accept for TLS connections, but are missing in the
default Java certificate store
- validator/ data files used by the JOSM validator
- *.cfg files designed for the old tagchecker, still in use
- *.mapcss default validation rules for the MapCSS-based tagchecker
- opening_hours.js Javascript code to validate opening hours tag
(external library, see
- boundaries.osm OSM file containing boundary data for the states of the earth, including
data for right and left-hand traffic
- defaultpresets.xml data file for the core tagging presets
- help-browser.css CSS file for the help sites (HTML content is downloaded from the website
on demand, but displayed inside the programm in a Java web browser component.)
- overpass-wizard.js Javascript code to provide a wizard-GUI for creating Overpass requests
(external library, see
- *.lang translation data
- *.xsd xml schema files for validation of configuration files
- data_nodist/ data files that are useful for development, but not distributed
- exif-direction-example.jpg
sample image, that contains direction information in the EXIF header
(keys: Exif.GPSInfo.GPSImgDirectionRef, Exif.GPSInfo.GPSImgDirection)
- filterTests.osm used for unit testing of the filter feature
(see test/unit/org/openstreetmap/josm/data/osm/
- Join_Areas_Tests.osm some examples to test the 'join areas' feature
- *.* various other data files used for unit testing and as reference file
- projection/ projection files
- *.gsb NTv2 grid files for projection support, downloaded by the
client on demand (see CONTRIBUTION)
- CHENyx06-Distribution.pdf
archive of terms of use for the CHENyx06.gsb file
- epsg EPSG data file, taken from the proj.4 project
- esri ESRI data file, taken from the proj.4 project
- josm-epsg customizations to the epsg file, used together with the epsg file
to generate data/projection/custom-epsg

- projection-reference-data.csv
reference data for projection tests
(see test/unit/org/openstreetmap/josm/data/projection/
- projection-regression-test-data.csv
regression data for projection tests
(see test/unit/org/openstreetmap/josm/data/projection/
- trans/*.lang translation data for files that are not distributed, but used
by the server for localization of the services;
currently contains plugin descriptions in order to include translations
in the downloaded plugin list
- gpl-2.0.txt, gpl-3.0.txt full text of the GNU General Public License
- images/ images distributed with the JOSM binary
- icons images for the Potlatch 2 style
- presets images for the main mappaint style and the internal presets
- images_nodist/ images, which are not for distribution, but may be useful later (e.g. high
resolution and vector versions)
- josm.jnlp Java Web Start launcher file (used on the website for the tested version)
- josm-latest.jnlp Java Web Start launcher file (used on the website for the latest version)
- LICENSE the JOSM license terms
- linux/ files useful for Linux distributions, including Appdata files, .desktop
files, Debian/Ubuntu scripts, man pages, icons, etc.
- macosx/ files needed to create the MacOS X package
- netbeans/ preconfigured Netbeans project
- patches/ patches for external libraries used in JOSM (see below)
- README this file
- resources/ resource files that will be included in the JOSM jar file
- scripts/ various scripts used by JOSM developers
called from the ant build file to combine the files epsg and josm-epsg
to create the custom-epsg file for distribution
- tool to find all used icons and allows deleting unused icons
searches also for images with incompatible svg code
- optimize-images short script to decrease size of PNG images
- developer tool to replace "@since xxx" in Javadoc by the upcoming revision number
script to compare and analyse the differences of the editor layer index and the
JOSM imagery list (see
- extracts tag information for the taginfo project
- src/ the source code of the application
- start.html HTML page to run the applet version of JOSM
- styles/ map styles included in JOSM
- sytles_nodist/ files needed for map style maintenance
- potlatch2/README infos on how to update the Potlatch 2 style from upstream sources
- test/ automated software tests
- data/ resources used for some tests
- functional/ functional tests (source code)
- lib/ libraries needed for (some of) the tests, including JUnit
- performance/ performance tests (source code)
- unit/ unit tests (source code)
- tools/ libraries and tools that help in the development process
- animal-sniffer-ant-tasks.jar
used to build and check code signatures to ensure plugins binary compatibility
- appbundler-1.0ea.jar used to build Mac OS X package
- checkstyle/ libs and config files for checkstyle (automatically detects code style
problems in source code); can be launched as an ant target in build.xml
- error_prone_ant.jar used to detect code errors during compilation
- spotbugs/ libs and config files for spotbugs (automatically detects common bugs and potential
problems in source code); can be launched as an ant target in build.xml
- jacocoant.jar used to include coverage data into JUnit test reports
- japicc/ used to generate a compatibility report between optimized jar and normal one
- javacc.jar used in the build process to generate some .java files from a javacc source file
- proguard.jar optimize final binary jar - see build.xml (not used in production so far)
- xmltask.jar used to edit XML files from Ant for the OSX package
- windows/ files needed to create the Windows installer

The 'patches' directory
Some libraries that JOSM depends on, are patched for various reasons. The
files in the patches directory can be used to roll back these customizations.
This is useful in order to
* inspect the changes
* update to a newer version of the library but keep the modifications

You can use 'quilt' to manage the patches. E.g. the following command applies all of them:

$ quilt push -a

Of course, it is also possible to apply the patch files manually one by one.

Third party libraries
There are some third party libraries which are directly included in the source code tree, in particular:

* jmapviewer: Java component to browse a TMS map
src/org/openstreetmap/gui (svn external)
* Apache commons compress: Support for bzip2 compression when opening files
src/org/apache/commons/compress/compressors (svn external)
* Apache commons validator: Improved validator routines
* SVG Salamander: Support for SVG image format
* Metadata Extractor: Read EXIF Metadata of photos
* Signpost: OAuth library
src/oauth, src/com/google
* MultiSplitPane: Small lib for GUI layout management
* swinghelper: Class CheckThreadViolationRepaintManager to find classpath violations
* xz extractor