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1Supplemental information for JOSM -- the Java OpenStreetMap Editor
4            I. Install & Launch
7Installation notes
9To run JOSM, you need:
11* The JOSM .jar file, e.g., josm-tested.jar or josm-latest.jar
12* Java Runtime Environment (JRE) 8, or later.
15How to get Java Runtime Environment
17You need JRE Version 8, or later.
19Microsoft Windows and Apple Mac OS X users should visit
20and download the latest Java executable for their system.
22Linux users should visit
23There is a Linux binary installer, which you must execute from a console, or
24use the mechanism of your distribution's packaging system.
27How to launch
29Microsoft Windows users launch by double-clicking on the .jar file.
30If this does not work, open a command shell and type
31"java -jar josm-latest.jar"  in the directory that holds the file. (Please
32replace josm-latest.jar with the name of your .jar file, if you aren't using
33the latest version.)
35Under Linux, open a shell, go to the file directory and type
36"java -jar josm-latest.jar" to launch. If this does not work, try to set
37your JAVA_HOME variable to the java executable location (the root location,
38not the bin).
40macOS users just click on the .jar file icon.
43            II. Development
46How to get the source code
48Download it directly from the subversion at
49 To use the command line subversion
50client, type
52svn co josm
55Files & directories
57This is an overview of the files and directories in the JOSM code repository:
58- build.xml                 ant build file (standard way to create a JOSM binary)
59- CONTRIBUTION              list of major code contributors
60- data/                     data files that will be included in the JOSM jar file
61    - fonts/                font files used for map rendering
62    - gpx/                  different color gradients for gpx drawing
63    - projection/           projection files
64      - custom-epsg         list of projection definitions, auto-generated file created by ant task 'epsg'
65    - security/*.pem        certificates that we like to accept for TLS connections, but are missing in the
66                            default Java certificate store
67    - validator/            data files used by the JOSM validator
68      - *.cfg               files designed for the old tagchecker, still in use
69      - *.mapcss            default validation rules for the MapCSS-based tagchecker
70      - opening_hours.js    Javascript code to validate opening hours tag
71                            (external library, see
72    - boundaries.osm        OSM file containing boundary data for the states of the earth, including
73                            data for right and left-hand traffic
74    - defaultpresets.xml    data file for the core tagging presets
75    - help-browser.css      CSS file for the help sites (HTML content is downloaded from the website
76                            on demand, but displayed inside the programm in a Java web browser component.)
77    - overpass-wizard.js    Javascript code to provide a wizard-GUI for creating Overpass requests
78                            (external library, see
79    - *.lang                translation data
80    - *.xsd                 xml schema files for validation of configuration files
81- data_nodist/              data files that are useful for development, but not distributed
82    - exif-direction-example.jpg
83                            sample image, that contains direction information in the EXIF header
84                            (keys: Exif.GPSInfo.GPSImgDirectionRef, Exif.GPSInfo.GPSImgDirection)
85    - filterTests.osm       used for unit testing of the filter feature
86                            (see test/unit/org/openstreetmap/josm/data/osm/
87    - Join_Areas_Tests.osm  some examples to test the 'join areas' feature
88    - *.*                   various other data files used for unit testing and as reference file
89    - projection/           projection files
90      - *.gsb               NTv2 grid files for projection support, downloaded by the
91                            client on demand (see CONTRIBUTION)
92      - CHENyx06-Distribution.pdf
93                            archive of terms of use for the CHENyx06.gsb file
94      - epsg                EPSG data file, taken from the proj.4 project
95                            (see
96      - esri                ESRI data file, taken from the proj.4 project
97                            (see
98      - josm-epsg           customizations to the epsg file, used together with the epsg file
99                            to generate data/projection/custom-epsg
101      - projection-reference-data.csv
102                            reference data for projection tests
103                            (see test/unit/org/openstreetmap/josm/data/projection/
104      - projection-regression-test-data.csv
105                            regression data for projection tests
106                            (see test/unit/org/openstreetmap/josm/data/projection/
107    - trans/*.lang          translation data for files that are not distributed, but used
108                            by the server for localization of the services;
109                            currently contains plugin descriptions in order to include translations
110                            in the downloaded plugin list
111- gpl-2.0.txt, gpl-3.0.txt  full text of the GNU General Public License
112- images/                   images distributed with the JOSM binary
113    - icons                 images for the Potlatch 2 style
114    - presets               images for the main mappaint style and the internal presets
115- images_nodist/            images, which are not for distribution, but may be useful later (e.g. high
116                            resolution and vector versions)
117- josm.jnlp                 Java Web Start launcher file (used on the website for the tested version)
118- josm-latest.jnlp          Java Web Start launcher file (used on the website for the latest version)
119- LICENSE                   the JOSM license terms
120- linux/                    files useful for Linux distributions, including Appdata files, .desktop
121                            files, Debian/Ubuntu scripts, man pages, icons, etc.
122- macosx/                   files needed to create the MacOS X package
123- netbeans/                 preconfigured Netbeans project
124- patches/                  patches for external libraries used in JOSM (see below)
125- README                    this file
126- resources/                resource files that will be included in the JOSM jar file
127- scripts/                  various scripts used by JOSM developers
128  -
129                            called from the ant build file to combine the files epsg and josm-epsg
130                            to create the custom-epsg file for distribution
131  -             tool to find all used icons and allows deleting unused icons
132                            searches also for images with incompatible svg code
133  - optimize-images         short script to decrease size of PNG images
134  -         helper script to update language links in presets file
135  -            developer tool to replace "@since xxx" in Javadoc by the upcoming revision number
136  - SyncEditorLayerIndex.groovy
137                            script to compare and analyse the differences of the editor layer index and the
138                            JOSM imagery list (see
139  - TagInfoExtract.groovy   extracts tag information for the taginfo project
140- src/                      the source code of the application
141- start.html                HTML page to run the applet version of JOSM
142- styles/                   map styles included in JOSM
143- sytles_nodist/            files needed for map style maintenance
144    - potlatch2/README      infos on how to update the Potlatch 2 style from upstream sources
145- test/                     automated software tests
146    - data/                 resources used for some tests
147    - functional/           functional tests (source code)
148    - lib/                  libraries needed for (some of) the tests, including JUnit
149    - performance/          performance tests (source code)
150    - unit/                 unit tests (source code)
151- tools/                    libraries and tools that help in the development process
152    - animal-sniffer-ant-tasks.jar
153                            used to build and check code signatures to ensure plugins binary compatibility
154    - appbundler-1.0ea.jar  used to build Mac OS X package
155    - checkstyle/           libs and config files for checkstyle (automatically detects code style
156                            problems in source code); can be launched as an ant target in build.xml
157    - commons-cli-1.3.1.jar dependency of Groovy Ant task
158    - error_prone_ant.jar   used to detect code errors during compilation
159    - spotbugs/             libs and config files for spotbugs (automatically detects common bugs and potential
160                            problems in source code); can be launched as an ant target in build.xml
161    - groovy-all.jar        used for some unit tests and various scripts
162    - jacocoant.jar         used to include coverage data into JUnit test reports
163    - japicc/               used to generate a compatibility report between optimized jar and normal one
164    - javacc.jar            used in the build process to generate some .java files from a javacc source file
165                            (src/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSParser.jj)
166    - proguard.jar          optimize final binary jar - see build.xml (not used in production so far)
167    - xmltask.jar           used to edit XML files from Ant for the OSX package
168- windows/                  files needed to create the Windows installer
170The 'patches' directory
172Some libraries that JOSM depends on, are patched for various reasons. The
173files in the patches directory can be used to roll back these customizations.
174This is useful in order to
175 * inspect the changes
176 * update to a newer version of the library but keep the modifications
178You can use 'quilt' to manage the patches. E.g. the following command applies all of them:
180 $ quilt push -a
182Of course, it is also possible to apply the patch files manually one by one.
184Third party libraries
186There are some third party libraries which are directly included in the source code tree, in particular:
188* jmapviewer: Java component to browse a TMS map
189    src/org/openstreetmap/gui (svn external)
190    ->
191* Apache commons compress: Support for bzip2 compression when opening files
192    src/org/apache/commons/compress/compressors (svn external)
193    ->
194* Apache commons validator: Improved validator routines
195    src/org/openstreetmap/josm/data/validation/routines
196    ->
197* SVG Salamander: Support for SVG image format
198    src/com/kitfox/svg
199    ->
200* Metadata Extractor: Read EXIF Metadata of photos
201    src/com/drew
202    ->
203* Signpost: OAuth library
204    src/oauth, src/com/google
205    ->
206* MultiSplitPane: Small lib for GUI layout management
207    src/org/openstreetmap/josm/gui/,
208    ->
209    ->
210* swinghelper: Class CheckThreadViolationRepaintManager to find classpath violations
211    src/org/jdesktop/swinghelper/debug/
212    ->
213* xz extractor
214    src/org/tukaani
215    ->
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