A bug report message appeared after launching JOSM. Before that I installed several plugins.

[anonymous]

What steps will reproduce the problem?

1. Install FixAdresses, ImproveWay, JOSM.Missing.Tools, osmwiki-dataitem, RelationDissolve, gridify plugins.
2. Uninstall undelete and urbaneye3d plugins(they were installed by me).
3. Restart JOSM

What is the expected result?

Normal start and working of JOSM

What happens instead?

A bug report message and freezing on launching JOSM.Missing.Tools plugin...

Please provide any additional information below. Attach a screenshot if possible.

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2026-01-31 13:00:34 +0100 (Sat, 31 Jan 2026)
Revision:19481
Build-Date:2026-02-01 02:30:45
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (19481 en) Linux Debian GNU/Linux 12 (bookworm)
Memory Usage: 1536 MB / 1536 MB (1253 MB allocated, but free)
Java version: 17.0.18+8-Debian-1deb12u1, Debian, OpenJDK 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.motif.MotifLookAndFeel
Screen: :0.0 1024x768x[Multi depth]@75Hz (scaling 1.00×1.00)
Maximum Screen Size: 1024×768
Best cursor sizes: 16×16→16×16, 32×32→32×32
Environment variable LANG: en_US.UTF-8
System property file.encoding: UTF-8
System property sun.jnu.encoding: UTF-8
Locale info: en_US
Numbers with default locale: 1234567890 -> 1234567890
Desktop environment: LXDE
Java package: openjdk-17-jre:amd64-17.0.18+8-1~deb12u1
Java ATK Wrapper package: libatk-wrapper-java:all-0.40.0-3
libcommons-compress-java: libcommons-compress-java:all-1.22-1
libcommons-logging-java: libcommons-logging-java:all-1.2-3
fonts-noto: fonts-noto:all-20201225-1
VM arguments: [--module-path=/usr/share/openjfx/lib, --add-modules=java.scripting,java.sql,javafx.controls,javafx.media,javafx.swing,javafx.web, -Djosm.restart=true, -Djava.net.useSystemProxies=true, -XX:MaxRAMPercentage=75.0, --add-exports=java.base/sun.security.action=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED]

Plugins:
+ FastDraw
+ FixAddresses
+ ImproveWay (40)
+ JOSM.Missing.Tools
+ MakeParallel (v1.1.0)
+ Mapillary
+ MultiLineToolbar
+ PerpendicularWayFromNode
+ PolygonCutOut
+ RelationDissolve
+ Review.Changes (1.1.1)
+ RoadSigns
+ apache-commons (36474)
+ apache-http (36474)
+ buildings_tools
+ changeset-viewer
+ comfort0
+ conflation (274)
+ contourmerge
+ ejml (36474)
+ fastdriveway
+ geotools (36474)
+ gridify
+ jackson
+ jaxb (36474)
+ jna (36474)
+ jts (36474)
+ measurement
+ merge-overlap
+ opendata
+ osm-obj-info
+ osmwiki-dataitem
+ reverter (36474)
+ sidewalks
+ turnrestrictions
+ utilsplugin2 (36474)
+ waydownloader
+ wikipedia

Tagging presets:
+ https://josm.openstreetmap.de/josmfile?page=Presets/Addr2&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/BuildingPreset&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Crafts&zip=1
+ https://cdn.jsdelivr.net/npm/name-suggestion-index@latest/dist/presets/nsi-josm-presets.min.xml
+ https://josm.openstreetmap.de/josmfile?page=Presets/NewTags&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/OneClick&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/ParcelLockers&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Playground_Equipment&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Simple_Indoor_Tagging&zip=1
+ https://osmtools.de/josm/steps.xml
+ https://josm.openstreetmap.de/josmfile?page=Presets/ParkingLanes&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/LaneAttributes&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/PublicTransportOneClick&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Quick-highways&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/CommonKeyboardShortcuts&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/FitnessStationEquipment&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/NewParkingFeatures&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/StreetCabinet&zip=1

Map paint styles:
- https://raw.githubusercontent.com/tordanik/direction-cones-style/refs/heads/main/direction-cones.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/Coloured_Streets&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/SidewalksAndFootways&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/AddressValidator&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Lit&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/BuildingColors&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Enhanced_Lane_and_Road_Attributes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/ColorWays&zip=1
- https://raw.githubusercontent.com/yopaseopor/indoormap/master/indoormap-style.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/FixmeAndNote&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Landcover&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/LastUpdated&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Maxspeed&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/MaxspeedIcons&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Surface&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Modified&zip=1

Validator rules:
+ https://josm.openstreetmap.de/josmfile?page=Rules/CheckDate&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Rules/MissingMain&zip=1

Last errors/warnings:
- 00028.970 E: java.lang.IllegalStateException: Error adding certificate HARICA TLS RSA Root CA 2021 - certificate fingerprint mismatch. Expected 8dd4b5373cb0de36769c12339280d82746b3aa6cd426e797a31babe4279cf00b, was d95d0e8eda79525bf9beb11b14d2100d3294985f0c62d9fabd9cd999eccb7b1d
- 00029.914 W: Missing plugin main version in plugin panoramax
- 00033.029 W: Missing plugin main version in plugin panoramax
- 00050.169 E: Failed to locate image 'lastupdated.png​'
- 00050.173 W: Mappaint style "standard" (LastUpdated) icon "lastupdated.png​" not found.
- 00080.376 E: Handled by bug report queue: java.lang.UnsupportedClassVersionError: org/openstreetmap/josm/plugins/missingtools/MissingTools has been compiled by a more recent version of the Java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 61.0



=== STACK TRACE ===
Thread: main (1)
java.lang.UnsupportedClassVersionError: org/openstreetmap/josm/plugins/missingtools/MissingTools has been compiled by a more recent version of the Java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 61.0
	at java.base/java.lang.ClassLoader.defineClass1(Native Method)
	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1017)
	at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
	at java.base/java.net.URLClassLoader.defineClass(URLClassLoader.java:524)
	at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:427)
	at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:421)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:712)
	at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:420)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:592)
	at org.openstreetmap.josm.plugins.PluginClassLoader.loadClass(PluginClassLoader.java:64)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Class.java:469)
	at org.openstreetmap.josm.plugins.PluginInformation.loadClass(PluginInformation.java:402)
	at org.openstreetmap.josm.plugins.PluginHandler.loadPlugin(PluginHandler.java:864)
	at org.openstreetmap.josm.plugins.PluginHandler.loadPlugins(PluginHandler.java:927)
	at org.openstreetmap.josm.plugins.PluginHandler.loadLatePlugins(PluginHandler.java:1029)
	at org.openstreetmap.josm.gui.MainApplication.loadLatePlugins(MainApplication.java:1251)
	at org.openstreetmap.josm.gui.MainApplication.mainJOSM(MainApplication.java:1007)
	at org.openstreetmap.josm.gui.MainApplication$3.processArguments(MainApplication.java:280)
	at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:766)

[anonymous]

I reported that bug. I deleted manually JOSM.Missing.Tools plugin from user data folder and afterwards disabled in response to the dialogue window that appeared. As far as I see, the problem is related to the older Java runtime version.

[stoecker]

It seems it is compiled for java version 21, but reports "Plugin-Minimum-Java-Version: 11". Either it must be compiled for 11 or the manifest must be fixed to state java 21.