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    v53 v223  
    11[[TranslatedPages]]
     2[[PageOutline(2-3,Table of Contents)]]
     3
    24= Download =
    35
    4 == Overview ==
    5 
    6 || ||= OS Independent =||= [https://www.java.com/en/download/faq/java_webstart.xml Web Start] =||= Windows =||= Mac OS X =||= Ubuntu, … =||= openSUSE =||
    7 ||= **tested** [[Version(tested)]] =|| **[/josm-tested.jar jar ]** || [/download/josm.jnlp jnlp] || [/download/windows/josm-setup.exe setup.exe] ([wiki:USB_Stick portable]) || [/download/macosx/josm-macosx.zip package.zip] || ''[#Ubuntu see below]'' || ''[#openSUSE see below]'' ||
    8 ||= latest [[Version(latest)]] =|| [/josm-latest.jar jar] || [/download/josm-latest.jnlp jnlp] || || || ''[#Ubuntu see below]'' || ||
    9 ||= older =|| [/download/ download/] || || || || || ||
    10 
    11  * **Which version should I use?** (see also: [wiki:Releases release system])
    12    * ''tested'' is released approx. monthly and shouldn't contain severe bugs
    13    * ''latest'' is released daily, may have more errors
    14    * If possible, use the Web Start version in order to automatically update.
    15 * Verify josm.jar with jarsigner
    16 
    17 ----
    18 [[PageOutline(2-3,Page Outline)]]
    19 
    20  * **Note that there are fairly regular updates, so always try running a recent version (and also recent plugins).**
    21  * Access [/download/josm.jnlp JOSM-WebStart] without installation
    22  * Download the **[/josm-tested.jar tested JOSM ]** version [[Version(tested)]]
    23  * Download the [/download/windows/josm-setup.exe Windows JOSM installer] version [[Version(windows)]]
    24  * Download the [/download/macosx/josm-macosx.zip Mac OS X JOSM package] version [[Version(macos)]]
    25  * Prepare a [wiki:USB_Stick USB flash drive] to use JOSM on any foreign Windows machine.
    26  * For download scripts use version check for [/latest latest] and [/tested tested] (or [/version both]) to reduce download bandwith
    27  * If download size is an issue for you:
    28   * Append **?lang=…** to the download link address for both releases to strip unused translations (e.g. **?lang=de** will download JOSM in German language only).
    29   * **Note**: Use underscore to separate [[Translations|language codes]] with country code extensions, e.g. **?lang=en_GB**
    30   * Append **?unsigned=1** to strip the code signing information
    31   * When **lang** and **unsigned** are used the separation is a **&** sign like in **?lang=de&unsigned=1**
    32 
    33 
    34 == Mac OS X Mountain Lion Errors ==
    35 [[Image(#8787:damaged_josm_app.png,align=right,margin-top=-35)]]
    36  This misleading error message may appear: **JOSM.app is damaged and can't be opened. You should move it to the Trash.**
    37 
    38  To complete the install enter OS X Preferences, visit 'Security & Privacy', and change the settings to allow downloads from 'anywhere'.
    39 
    40  After JOSM runs the first time you can return the setting to the original position.
    41 
    42 
    43 == Development Version ==
    44 
    45  * Download the **[/josm-latest.jar latest JOSM]** version [[Version(latest)]] (may have more errors than "tested", be careful with this one).
    46 
    47 == Source ==
    48 
    49  * Get the source:
    50    * From the official Subversion repository (recommended):
    51 {{{
    52 #!sh
    53 svn co https://josm.openstreetmap.de/svn/trunk josm
    54 }}}
    55    * From the official OSM Subversion repository (including plugins):
    56 {{{
    57 #!sh
    58 svn co https://svn.openstreetmap.org/applications/editors/josm
    59 }}}
    60    * From the unofficial [https://github.com/openstreetmap/josm GitHub mirror]:
    61 {{{
    62 #!sh
    63 git clone git://github.com/openstreetmap/josm.git
    64 }}}
    65 
    66 == openSUSE repository#openSUSE
    67 
    68 Tested version of JOSM is available in the Application:Geo repository.
    69 
    70 First add as root user in yast or with zypper the repository (replace the version in the URL with the one you are using):
    71 {{{
    72 zypper ar -f http://download.opensuse.org/repositories/Application:/Geo/openSUSE_13.2 Application:Geo
    73 }}}
    74 
    75 Then simply install **josm** and **josm-fonts** package.
    76 
    77 == Ubuntu repository ==#Ubuntu
    78 
    79 This is a package repository primarily for Ubuntu. It should also work with other Debian based (especially Ubuntu based) distributions, but we do not actively test and maintain any distributions other than Ubuntu.
    80 [[BR]]
    81 Note: in addition to the regular procedure described below, older DEBs can be manually downloaded and clicked to be installed from the following directories:   [https://josm.openstreetmap.de/apt/pool/universe/j/josm/ for josm]  [https://josm.openstreetmap.de/apt/pool/universe/j/josm-latest/ for josm-latest] 
     6This page provides basic JOSM installation steps and troubleshooting information.
     7To start working with JOSM please see the [wikitr:/Introduction] and the [wikitr:/Help] pages.
     8And for very complex issues see [wikitr:/InstallNotes Installation Notes].
     9
     10== Recommended options ==#Recommendedoptions
     11[[JOSMImage(openlocation, valign=middle, link=[download/josm.jnlp])]] **Start [/download/josm.jnlp josm.jnlp]** (newest tested version) \\
     12Recommended version, all platforms, automatic update to the newest ''tested version'' monthly ([#Webstart how to start]). \\ \\
     13
     14[[JOSMImage(download, valign=middle, link=[/josm-tested.jar])]] **Download [/josm-tested.jar josm-tested.jar]** (tested version [[Version(tested)]]) \\
     15All platforms ([#Java how to run]). \\ \\
     16
     17
     18== All download options ==#Moredownloadoptions
     19Every [/roadmap month] the team of JOSM [wikitr:/Releases releases] a **tested version** for download.
     20The MS Windows and Apple macOS variants are built on this tested version.
     21When you click on josm.jnlp to launch JOSM you will always get the newest tested version. Java's [wikitr:/InstallNotes#Webstart Web Start] is the mechanism behind this.
     22
     23[=#DevelopmentVersion]
     24Every [/log/josm/?verbose=on&limit=20 night] the build systems generate a **latest version**.
     25These versions might have severe errors. But mostly they work well, too.
     26For the latest version is also a Web Start variant available.
     27
     28||= =||||= **For all operating systems** =|||||||| ||= **Development** =||
     29||=**Version** =||= **Web Start** =||= **Download** =||= **Windows** =||= **Apple macOS** =||= **Ubuntu, Debian…**  =||= **openSUSE** =||= **Jar / Javadoc / Source** =||
     30||**tested [[Version(tested)]]** ||  \
     31||  [/download/josm.jnlp josm.jnlp]  ||  \
     32||  [/josm-tested.jar]  ||  \
     33||  \\ [/download/windows/josm-setup.exe josm-setup.exe] \\ [/download/windows/josm-setup.msi josm-setup.msi] \\ [https://apps.microsoft.com/store/detail/josm/XPFCG1GV0WWGZX Microsoft Store]\\ ''([#Mswindowswrapper see below])''  ||  \
     34||  \\ [/download/macosx/josm-macosx.zip JOSM macOS .zip package] \\ ''or ([#macOS homebrew])''  ||  \
     35||  ''[#Ubuntu see below]''  ||  \
     36||  ''[#Opensuse see below]''  ||  \
     37||  [/nexus/content/groups/public/org/openstreetmap/josm/josm/ josm]:[[Version(tested)]]  ||
     38||**latest [[Version(latest)]]** ||  \
     39||  [/download/josm-latest.jnlp latest.jnlp]  ||  \
     40||  [/josm-latest.jar]  ||  \
     41||  ''see [https://github.com/openstreetmap/josm/releases releases on github]  ||  \
     42||  ''see [https://github.com/openstreetmap/josm/releases releases on github]  ||  \
     43||  ''[#Ubuntu see below]''  || ||  \
     44||  [/nexus/content/groups/public/org/openstreetmap/josm/josm/SNAPSHOT/ Use snapshots]  ||
     45||=''**older**'' =|| ||  \
     46||  [/download/ download/]  ||  \
     47||  ''see [https://github.com/openstreetmap/josm/releases releases on github]  ||  \
     48||  ''see [https://github.com/openstreetmap/josm/releases releases on github]  ||  \
     49||  [/apt/pool/universe/j/ pool/]  || ||  \
     50||  [/nexus/content/groups/public/org/openstreetmap/josm/josm/ tested versions]  ||
     51
     52When running scripts please first check on [/latest latest], [/tested tested] or [/version all] to reduce download bandwidth.
     53
     54** Strip translations **[=#Striptranslations]  \\
     55If download size is an issue, smaller files of the tested version are available. For downloads containing only English append [/josm-tested.jar?lang=en ?lang=en] to the URL. To include one translation replace `en` with the [wikitr:/TracLanguages language code] you want (lowercase first character, supported languages only). You can further reduce the file size by stripping the signing information off with appending [/josm-tested.jar?lang=en&unsigned=1 ?unsigned=1].
     56
     57
     58== Linux Repositories ==
     59=== JOSM's Debian based mainly for Ubuntu ===#Ubuntu
     60This is our own package repository primarily for Ubuntu. It should also work with other Debian based (especially Ubuntu based) distributions, but we do not actively test and maintain any distributions other than Ubuntu.
    8261
    8362The repository contains two packages:
    84  {{{josm}}}:: ''The tested version''[[br]]
    85   Replaces the package from the official Ubuntu repository.
    86  {{{josm-latest}}}:: ''The development version (nightly build)''[[br]]
    87  Can be installed parallel to the {{{josm}}} package. The default preference folder is {{{~/.josm-latest}}}.
    88 
    89 === Installation ===
    90 
    91 Edit the package resource list {{{/etc/apt/sources.list}}}:
    92 
    93 {{{
    94 #!sh
    95 sudo editor /etc/apt/sources.list
     63* ''josm'' – Provides the tested version (stable). Replaces the package from the official repository of your distribution. The default JOSM directories name is set to `JOSM`.
     64* ''josm-latest'' – The latest version (nightly). Can be installed in parallel to the josm package, therefore the default JOSM directories name is set to `JOSM-latest`.
     65Both packages provide `/etc/default/josm` respectively `/etc/default/josm-latest` as config file for [wikitr:Help/CommandLineOptions#Javaoptions java options].
     66
     67In addition to the regular procedure described below, older DEBs can be manually downloaded from the [/apt/pool/universe/j/ archives].
     68
     69==== Installation ====
     70Edit the package resource list `/etc/apt/sources.list.d/josm.list`:
     71{{{#!sh
     72sudo editor /etc/apt/sources.list.d/josm.list
     73}}}
     74{{{#!comment
     75### below does not work on GNU Debian systems
     76`sudo $EDITOR /etc/apt/sources.list.d/josm.list`
    9677}}}
    9778
    9879and add one of the following lines according to your Ubuntu-Version:
    9980
    100 {{{
    101 deb https://josm.openstreetmap.de/apt lucid universe
    102 deb https://josm.openstreetmap.de/apt precise universe
    103 deb https://josm.openstreetmap.de/apt quantal universe
    104 deb https://josm.openstreetmap.de/apt raring universe
    105 deb https://josm.openstreetmap.de/apt saucy universe
    106 deb https://josm.openstreetmap.de/apt trusty universe
    107 deb https://josm.openstreetmap.de/apt utopic universe
    108 deb https://josm.openstreetmap.de/apt vivid universe
    109 }}}
    110 
    111 Alternatively, this can  be done with the following one-liner:
    112 {{{
    113 echo deb https://josm.openstreetmap.de/apt $(lsb_release -sc) universe | sudo tee /etc/apt/sources.list.d/josm.list > /dev/null
    114 }}}
    115 
    116 For other Debian based distributions, add the following line:
    117 
    118 {{{
    119 deb https://josm.openstreetmap.de/apt alldist universe
    120 }}}
    121  
     81{{{#!sh
     82deb [signed-by=/usr/local/share/keyrings/josm-apt.gpg] https://josm.openstreetmap.de/apt plucky universe
     83deb [signed-by=/usr/local/share/keyrings/josm-apt.gpg] https://josm.openstreetmap.de/apt oracular universe
     84deb [signed-by=/usr/local/share/keyrings/josm-apt.gpg] https://josm.openstreetmap.de/apt noble universe
     85deb [signed-by=/usr/local/share/keyrings/josm-apt.gpg] https://josm.openstreetmap.de/apt jammy universe
     86deb [signed-by=/usr/local/share/keyrings/josm-apt.gpg] https://josm.openstreetmap.de/apt focal universe
     87deb [signed-by=/usr/local/share/keyrings/josm-apt.gpg] https://josm.openstreetmap.de/apt bionic universe
     88
     89# For other Debian based distributions add:
     90deb [signed-by=/usr/local/share/keyrings/josm-apt.gpg] https://josm.openstreetmap.de/apt alldist universe
     91}}}
     92
     93Alternatively, this can be done with the following one-liner in Ubuntu (not for Ubuntu based distributions like Linux Mint):
     94{{{#!sh
     95echo "deb [signed-by=/usr/local/share/keyrings/josm-apt.gpg] https://josm.openstreetmap.de/apt $(lsb_release -sc) universe" | sudo tee /etc/apt/sources.list.d/josm.list > /dev/null
     96}}}
     97or for Linux Mint:
     98{{{#!sh
     99echo "deb [signed-by=/usr/local/share/keyrings/josm-apt.gpg] https://josm.openstreetmap.de/apt $(grep ^DISTRIB_CODENAME= /etc/upstream-release/lsb-release| awk -F = '{print $(2)}') universe" | sudo tee /etc/apt/sources.list.d/josm.list > /dev/null
     100}}}
    122101
    123102{{{#!comment
    124103### below did not work on all systems
    125104and add the following line:
    126 `
    127 deb https://josm.openstreetmap.de/apt VERSION universe
    128 `
    129 }}}
    130 
    131 Download and register the [[/josm-apt.key|public key]]:
     105{{{#!sh
     106`deb [signed-by=/usr/local/share/keyrings/josm-apt.gpg] https://josm.openstreetmap.de/apt VERSION universe`
     107}}}
     108}}}
     109
     110Download the [/josm-apt.key public key]:
     111{{{#!sh
     112# Create the directory for manually downloaded keys if it was not already created
     113sudo mkdir -p /usr/local/share/keyrings
     114# Download the key
     115wget -q https://josm.openstreetmap.de/josm-apt.key -O- | sudo gpg --dearmor -o /usr/local/share/keyrings/josm-apt.gpg
     116}}}
     117In the past, instructions used `apt-key`. If the key was added to system's keyring, following line will remove it:
     118{{{#!sh
     119sudo apt-key del $(apt-key list | grep -B1  "<josm-dev@openstreetmap.org>" | sed '$d' | cut -b 48-51,53-57)
     120}}}
     121
     122Now refresh your sources:
     123{{{#!sh
     124# You may need to install ssl support for apt in advance:
     125sudo apt-get install apt-transport-https
     126# Refresh sources
     127sudo apt-get update
     128}}}
     129
     130and install:
     131{{{#!sh
     132# You can skip this first line if these packages were not installed before.
     133sudo apt-get remove josm josm-plugins
     134
     135# For the tested version
     136sudo apt-get install josm
     137# For the development version
     138sudo apt-get install josm-latest
     139}}}
     140
     141
     142=== GNU Debian ===#GNUDebian
     143Our own Ubuntu packages, [#Ubuntu above], work on Debian and we recommend to use them. Depending on the setup of `sudo`, some instruction will not work as "normal" user but only as `root`.
     144
     145The tested version of [https://packages.debian.org/stable/josm JOSM] is available under **''main''** in section **''utils''**, but the version is usually quite old. \\
     146Please, use the [https://backports.debian.org backports repository] to get a more up-to-date version, see [https://backports.debian.org/Instructions Instructions]. This version might still be older than our own packages.
     147
     148Since Debian 11 (bullseye) the [https://packages.debian.org/stable/josm-installer josm-installer] is available under **''main''** in section **''utils''**. It downloads the current .jar file from this site and updates it if necessary.
     149
     150=== openSUSE  ===#Opensuse
     151The tested version of JOSM is available in the Application:Geo repository.[=#openSUSE]
     152
     153First add as root user in yast or with zypper the repository (for Tumbleweed replace **$releasever** with **openSUSE_Tumbleweed**):
     154{{{#!sh
     155zypper ar -f 'https://download.opensuse.org/repositories/Application:/Geo/$releasever' Application:Geo
     156}}}
     157
     158Then simply install ''josm'' and ''josm-fonts'' package.
     159
     160
     161== Troubleshooting ==
     162=== Java ===#Java
     163When you double-click on a jar file and nothing happens in most cases this means Java isn't installed.
     164
     165JOSM now recommends [https://www.azul.com/downloads/?version=java-21-lts&package=jdk-fx#zulu Azul] or [https://bell-sw.com/pages/downloads/?package=jre-full#mn Bellsoft Liberica] JDK's. Generally speaking, the current Java LTS should be preferred (at time of writing, that would be Java 17), but Java 11 will work. See the [source:/trunk/README README] for current recommendations. But first give the Java already distributed with the operating system a try, [https://en.wikipedia.org/wiki/OpenJDK for example].
     166
     167
     168When choosing a download keep in mind:
     169 * A Java Plug-in for web browsers is **not** needed to run JOSM. Therefore results from pages like www.java.com/en/download/installed8.jsp are not relevant.
     170 * A Java variant with 64 bit is recommended for JOSM. The operating systems architecture is important for deciding between 32 bit Java or 64 bit Java. Because JOSM is **not** affected by the web browsers architecture most recommendations on this page www.java.com/en/download/faq/java_win64bit.xml are not relevant.
     171 * Avoid pages like www.java.com/en/download which intent to place Java Plug-ins in web browsers. And this is **not** important for JOSM.
     172
     173For further information visit the [InstallNotes Installation Notes] and [https://www.java.com/en/download/help/troubleshoot_java.xml troubleshooting] pages.
     174''Java'' in this section means a JRE (Java Runtime Engine) which provides a JVM (Java Virtual Machine) to run JOSM, a Java program that is developed using JDK (Java Development Kit) and sometimes launched with the JNLP (Java Network Launch Protocol aka Web Start and successor of Java Plug-ins).
     175
     176==== Testing Java ====#JavaTest
     177[=#Troubleshootingjarfile] Checks if Java is installed and why JOSM does not start (example mainly for MS Windows).
     1781. Download [/josm-tested.jar josm-tested.jar] to your desktop.
     1791. Open a Command Prompt aka Terminal
     1801. Type `cd %homepath%`⏎ and type `cd Desktop`⏎
     1811. Type `java -version `⏎ Three lines with the version data should appear. If you see something else then Java is not properly installed.
     1821. Type `java -jar josm-tested.jar`⏎. Now JOSM should run, started from the [wikitr:/Help/CommandLineOptions Command Line].
     1831. Quit JOSM.
     1841. Type `josm-tested.jar`⏎. If JOSM starts again, the Windows Explorer is ready for double clicks on jar files.
     185
     186
     187=== Web Start ===#Webstart
     188[=#Troubleshootingjhlplink]
     189You need to install [https://openwebstart.com/ OpenWebStart] first. It will download and run Java by itself. Please use the 64 bit (`x64`) version of OpenWebStart if you are on Microsoft Windows. The transition from Oracle WebStart to OpenWebStart is still in progress, so in case of issue please create a [/newticket new ticket] or post a comment to #17858.
     190
     191You may need to update the default application for opening JNLP files if you previously used Oracle WebStart. See [https://openwebstart.com/docs/OWSGuide.html#_jnlp_file_association jnlp file association] for instructions on setting OpenWebStart as the default program for jnlp files.
     192
     193==== Testing Web Start ====#Webstarttest
     1941. Download [/download/josm.jnlp josm.jnlp] to your desktop.
     1951. Open a Terminal and move to the Desktop as above
     1961. Type `javaws josm.jnlp`⏎. This should initially download JOSM, show a security dialog and then launch JOSM.
     1971. If that fails, then type `javaws -verbose josm.jnlp`⏎. This should first show a dialog with information about the JVM and then launch JOSM.
     198
     199
     200=== Virtual Machine ===#Troubleshootingjvm
     201==== Out of memory ====
     202Nowadays manually controlling Javas memory is seldom needed because available RAM on computers has grown.
     203Wrongly chosen values can decrease JOSM performance.
     204
     205For some tasks, JOSM has a large appetite for memory. On the one hand, it may be necessary to configure a memory size that supports more plugins and features. On the other hand can slow machines be stabilized by restricting Javas memory use.
     206If needed, use the [wikitr:/Help/CommandLineOptions command line] to set the [https://docs.oracle.com/en/java/javase/11/tools/java.html#GUID-3B1CE181-CD30-4178-9602-230B800D4FAE__BABHDABI Java Option] -Xmx…m, for example `-Xmx512m` or `-Xmx1536m`. In Debian/Ubuntu you can edit the file `/etc/default/josm` respectively `/etc/default/josm-latest`. \\
     207Formerly older java programs accepted `-Xmx=512m` or even `-Xmx 512m`. Now those malformed arguments throw error messages.
     208
     209==== VM selection ====#VMselectiononWindowsx64
     210On current versions of MS Windows by default Java is installed mainly in the `C:\Program Files\Java\` directory. Additional parts are placed in `C:\Program Files\Oracle\Java\`. There is a `.\javapath\` directory as target for the PATH environment variable. It is the home for the three virtual files `java.exe`, `javaw.exe` and `javaws.exe`. This files are symbolic links form the current Java installations.
     211
     212On older versions of 64 bit Windows sometimes the 32 bit mode JRE was additionally installed.  Also some browsers brought their own JVM with limited capabilities. In those cases a Web Start from the browser would not use your Java installation but that from the browser.
     213
     214Check that there's no other javawebstart in `\Windows\SysWow64`. The Java control panel will not detect it and you can safely delete it. Perform cleanup and only keep the latest versions of each JRE (One or the 32-bit mode, another one for the 64-bit mode).
     215
     216For shortcuts created on the desktop for JNLP and running the Javawebstart launcher , make sure to pass VM parameters prefixed with -J and no intermediate space before the VM option. If you have installed both the 32-bit and 64-bit version, you should pass the option "`-d64`" if you want to select the preferred 64-bit VM. Note that some Oracle documentation pages indicate the option "-D64" with the incorrect capitalization!)
     217
     218Example of an edited command line for a shortcut on the windows desktop:
    132219{{{
    133220#!sh
    134 wget -q https://josm.openstreetmap.de/josm-apt.key -O- | sudo apt-key add -
    135 }}}
    136 
    137 Now refresh your sources
     221javaws.exe -J-d64 -J-Xmx2048m  josm.jnlp
     222}}}
     223
     224=== Microsoft Windows ===#MSWindows
     225==== josm.exe ====#Mswindowswrapper
     226Using josm-setup.exe for installation on Microsoft Windows does the following:
     227 * Puts two executable files `JOSM.exe` and `HWConsole.exe` in directory `%LOCALAPPDATA%\JOSM`
     228 * Registers JOSM.exe as target for the file extensions `*.osm`, `*.geojson`, `*.gpx`, `*.jos` and `*.joz`.
     229 * Places JOSM shortcut icons on the Desktop and in the Start Menu.
     230 * Adds uninstall data at the appropriate places.
     231
     232When starting, JOSM.exe starts JOSM with an embedded version of Java maintained by JOSM developers, based on Azul Zulu.
     233JOSM.exe acts as a ''wrapper'' and is [wikitr:/USB_Stick portable].
     234
     235HWConsole.exe is similar to JOSM.exe but start JOSM while keeping open a Windows console displaying JOSM standard output (logs).
     236
     237JOSM.exe accepts all usual [wikitr:/Help/CommandLineOptions#Programarguments JOSM Program arguments]. See example:
     238
    138239{{{
    139240#!sh
    140 sudo apt-get update
    141 }}}
    142 and install:
    143  {{{josm}}}:: (You can skip the first line if you haven't installed these packages before.)
     241# Load OSM data
     242josm.exe https://www.osm.org/way/476702262
     243}}}
     244
     245For giving [wikitr:/Help/CommandLineOptions#Javaoptions Java options] to the Java VM, JOSM.exe uses the configuration file `JOSM.cfg` in its app sub-directory. In this file, each option must be on a separate line.
     246
     247For example, to change memory allocation, open `%LOCALAPPDATA%\JOSM\app\JOSM.cfg` and add `java-options=-Xmx8192m` (for 8 GB) to a new line under the `[JavaOptions]` header.
     248
     249==== Graphics ====#MicrosoftWindowsGraphics
     250Some Windows installations have graphics driver issues (see #23784 for an example). This may exhibit symptoms such as:
     251* Black bars in JOSM toolbars
     252* Flickering
     253* Other unexpected user interface issues
     254
     2551. Download and install Display Driver Uninstaller (DDU, [https://github.com/Wagnard/display-drivers-uninstaller source]) from the official mirror => https://www.wagnardsoft.com/display-driver-uninstaller-DDU-
     2562. From the "Device Type" drop-down on the right, select "GPU". DDU will automatically detect the GPU you're using.
     2573. Click on "Clean and Restart" at the top. This will uninstall the graphics drivers and restart your PC.
     2584. Reinstall the drivers.
     259
     260//**WARNING: Create a backup of your PC before using DDU. Although it creates a recovery point by itself, it's ideal to make one yourself just in case.**//
     261
     262=== macOS ===#macOS
     263[=#MacOSErrors][=#MacOSXMountainLionErrors][=#Macoserrors]
    144264{{{
    145 #!sh
    146 sudo apt-get remove josm josm-plugins
    147 sudo apt-get install josm
    148 }}}
    149 
    150  {{{josm-latest}}}::
    151 {{{
    152 #!sh
    153 sudo apt-get install josm-latest
    154 }}}
    155 
    156 
    157 === useful options ===
    158 
    159 If JOSM runs out of memory, you can increase the maximum size of allocated memory (400 MB in this example):
    160 {{{
    161 JAVA_OPTS="-Xmx400M" josm
    162 }}}
    163 
    164 Start with a different preference folder:
    165 {{{
    166 JAVA_OPTS="-Djosm.home=$HOME/.josm-tmp" josm
    167 }}}
    168 
    169 
    170 == VM selection on Windows x64 ==
    171 
    172 For Windows, beware that some browsers may install their own JRE only in 32 bit mode, but may also install their version of the Javawebstart tool somewhere else with different file associations. This may cause your JNLP to start with this alternate JRE because it runs the wrong version of Javawebstart which only supports the 32 bit VM, and sometimes is built with a restricted support for VM options and a max VM size not exceeding 256MB.
    173 
    174 Check, for example, if there's no other javawebstart in {{{\Windows\SysWow64}}}. You should not need it (the Java control panel will not detect it) and can safely delete it. Perfom cleanup and only keep the latest version of the JRE (1 for the 32-bit mode, another one for the 64-bit mode).
    175 
    176 For shortcuts created on the desktop for JNLP and running the Javawebstart launcher (from {{{\windows\system32}}}), make sure to pass VM parameters prefixed with -J and no intermediate space before the VM option. If you have installed both the 32-bit and 64-bit version, you should pass the option "{{{-d64}}}" if you want to select the preferred 64-bit VM. Note that some Oracle documentation pages indicate the option "-D64" with the incorrect capitalization!)
    177 
    178 Example of an edited commandline for the shortcut created on the windows desktop after running JOSM just once from the JNMP and exiting:
    179 {{{
    180 #!sh
    181 C:\Windows\System32\javaws.exe -J-d64 -Xmx=2048m -localfile -J-Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp "C:\Users\<snipped user name>\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\21\7311<snipped-hex-number>7f8"
    182 }}}
    183 You don't need to change the end of the command line with the snipped parts here. Just check the path for {{{javaws.exe}}} and add options {{{-J-d64}}} for the 64-bit mode needed to work with large OSM datasets, and {{{-Xmx=2048m}}} to increase the VM size (to 2GB here).
     265#!comment
     266old section title, keeping as anchor for old links
     267}}}
     268
     269==== Using brew ====#brew
     270macOS users may use the [https://brew.sh/ homebrew] package manager to install and update their JOSM instance.
     271
     272In Terminal, run the `brew install --cask josm` to install or `brew upgrade --cask josm` to upgrade to the current tested version of JOSM.
     273
     274=== Linux ===#linux
     275==== Arch Linux ====
     276Using AUR you can install [https://aur.archlinux.org/packages/openwebstart-bin openwebstart-bin].
     277
     278If you use [https://archlinux.org/packages/extra/x86_64/icedtea-web/ icedtea-web] instead of the recommended openwebstart you will get an error with the newest java. java-17-openjdk is known to work, but java-22-openjdk do not.
     279
     280
     281=== Known issues ===
     282Not closed issues about …:
     283* [/query?status=!closed&type=defect&keywords=~java Java issues] - some of the bugs lead to blockers in Oracle JVM (covered at [wiki:JavaBugs JavaBugs]).
     284* [/query?status=assigned&type=defect&status=needinfo&status=new&status=reopened&keywords=~linux&order=priority Linux]
     285* [/query?status=assigned&type=defect&status=needinfo&status=new&status=reopened&keywords=~ubuntu&order=priority Ubuntu]
     286* [/query?status=assigned&type=defect&status=needinfo&status=new&status=reopened&keywords=~macos&order=priority macOS]
     287* [/query?status=assigned&type=defect&status=needinfo&status=new&status=reopened&keywords=~windows&order=priority Windows]