Software requirements

JOSM requires a recent version of ​Java 6 runtime environment to be installed on your computer.

If you have only Java 5 and cannot update, there are older versions of JOSM available: Version ​3377 and below runs with Java 5. Old versions of JOSM, including Mac and Windows installers, are available in the ​download archive.

If you have only an old version of Java 6 (older than update 23, released in December 2010), you can run the latest version of JOSM, but you may face one of the following Java bugs. To get rid of one of these bugs, please perform the corresponding update actions.

• #7206: All OS: Cannot load preferences.xml -> Update to Java 6 update 14 or later (see ​Java bug 6708840)
• #6993: Ubuntu: Tooltips not displayed at the right place -> Install latest Ubuntu updates
• #6989: Ubuntu: Bad links sent to browser -> Install latest Ubuntu updates
• #6965: Windows: Error when using File/Save As -> Upgrade to Java 7 (see ​Java bug 6210674)
• #6769: Ubuntu: Download window initialization error -> Install latest Ubuntu updates or upgrade to Java 7 (see ​Java bug 6523403)