Software requirements

JOSM requires a recent version of ​Java 7 runtime environment to be installed on your computer.

JOSM is also compatible with Java 8 or later.

If you have only Java 5/6 and cannot update, there are older versions of JOSM available: Versions 3377 and below run with Java 5. Versions 7000 and below run with Java 6. Old versions of JOSM, including Mac and Windows installers, are available in the download archive.

If you have only an old version of Java 7 (older than update 25, released in June 2013), you can run the latest version of JOSM, but you may face one of the following Java bugs. To get rid of it, please perform the corresponding update actions.

• #8182: Mac OS: Cannot open files in directories with swedish characters in them -> Update to Java 7 update 10 or later (see ​Java bug 7193966)