java.lang.UnsupportedClassVersionError: ScriptingPlugin has been compiled by a more recent version of the Java Runtime (class file version 55.0)

[RAytoun ralph.aytoun@…]

I have updated to the latest version. Version 18463 of JOSM, josm-tested.jar. I am on Windows 10 Pro. I am trying to open JOSM from the downloaded Executable Jar File . JOSM loader window opens and gets as far as Loading plug-in 'scripting'... and just stops there. I have to use the Task Manager to end the process or it will not close

What steps will reproduce the problem?

What is the expected result?

What happens instead?

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

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2022-05-29 21:53:52 +0200 (Sun, 29 May 2022)
Build-Date:2022-05-30 01:30:57
Revision:18463
Relative:URL: ^/trunk

Identification: JOSM/1.5 (18463 en_GB) Windows 10 64-Bit
OS Build number: Windows 10 Pro 2009 (19044)
Memory Usage: 978 MB / 3612 MB (311 MB allocated, but free)
Java version: 1.8.0_331-b09, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 1366×768 (scaling 1.00×1.00) \Display1 1920×1080 (scaling 1.00×1.00) \Display2 1680×1050 (scaling 1.00×1.00)
Maximum Screen Size: 1920×1080
Best cursor sizes: 16×16→32×32, 32×32→32×32
System property file.encoding: Cp1252
System property sun.jnu.encoding: Cp1252
Locale info: en_GB
Numbers with default locale: 1234567890 -> 1234567890

Plugins:
+ FastDraw
+ Mapillary
+ PicLayer
+ apache-commons (35924)
+ apache-http (35924)
+ buildings_tools
+ conflation (0.6.9)
+ ejml (35924)
+ fieldpapers
+ geotools (35959)
+ imagery_offset_db
+ jackson
+ jaxb (35952)
+ jna (35924)
+ jts (35924)
+ mapathoner
+ mapwithai
+ measurement (35893)
+ opendata (35910)
+ pt_assistant
+ rasterfilters
+ reltoolbox (35893)
+ reverter (35972)
+ scripting
+ terracer
+ todo
+ tofix
+ utilsplugin2 (35970)

Map paint styles:
- https://github.com/MissingMaps/josm_styles/archive/master.zip
-  https://github.com/osmlab/applepaintstyles/archive/main.zip 
- https://raw.githubusercontent.com/OpenSidewalks/OpenSidewalks-Schema/master/open_sidewalks.mapcss
- https://github.com/MissingMaps/josm_styles/archive/master.zip
- https://pasharm.github.io/New_basic_style_for_JOSM/New_basic_style.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/PublicTransport&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/MapWithAI&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Ph_Typhoon&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/NoFeature&zip=1
- https://github.com/osmlab/appledata/archive/josm_paint_inline_validation.zip
- https://josm.openstreetmap.de/josmfile?page=Styles/Building_Levels_Labels&zip=1

Validator rules:
+ https://josm.openstreetmap.de/josmfile?page=Rules/KeepRight&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Rules/OSMLint&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Rules/QAToolInspiredValidations&zip=1

Last errors/warnings:
- 00004.263 W: Unexpected parameters for HTTP proxy. Got host 'null' and port '0'.
- 00004.265 W: The proxy will not be used.
- 00010.385 W: Not a single layer for the name 'tms[22]:https://services.digitalglobe.com/earthservice/tmsaccess/tms/1.0.0/DigitalGlobe:ImageryTileService@EPSG:3857@jpg/{zoom}/{x}/{-y}.jpg?connectId=ca613e76-811f-46e7-9e1d-84f6795441c2': []
- 00010.721 W: java.io.IOException: The requested URL https://raw.githubusercontent.com/OpenSidewalks/OpenSidewalks-Schema/master/open_sidewalks.mapcss was not found
- 00011.400 W: Failed to load Mappaint styles from 'https://raw.githubusercontent.com/OpenSidewalks/OpenSidewalks-Schema/master/open_sidewalks.mapcss'. Exception was: java.io.IOException: The requested URL https://raw.githubusercontent.com/OpenSidewalks/OpenSidewalks-Schema/master/open_sidewalks.mapcss was not found
- 00011.401 E: java.io.IOException: The requested URL https://raw.githubusercontent.com/OpenSidewalks/OpenSidewalks-Schema/master/open_sidewalks.mapcss was not found
- 00016.827 E: Handled by bug report queue: java.lang.UnsupportedClassVersionError: org/openstreetmap/josm/plugins/scripting/ScriptingPlugin has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0



=== REPORTED CRASH DATA ===
BugReportExceptionHandler#handleException:
No data collected.

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: main (1)
java.lang.UnsupportedClassVersionError: org/openstreetmap/josm/plugins/scripting/ScriptingPlugin has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.access$100(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at org.openstreetmap.josm.plugins.PluginClassLoader.loadClass(PluginClassLoader.java:74)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Unknown Source)
	at org.openstreetmap.josm.plugins.PluginInformation.loadClass(PluginInformation.java:402)
	at org.openstreetmap.josm.plugins.PluginHandler.loadPlugin(PluginHandler.java:810)
	at org.openstreetmap.josm.plugins.PluginHandler.loadPlugins(PluginHandler.java:898)
	at org.openstreetmap.josm.plugins.PluginHandler.loadLatePlugins(PluginHandler.java:950)
	at org.openstreetmap.josm.gui.MainApplication.loadLatePlugins(MainApplication.java:1227)
	at org.openstreetmap.josm.gui.MainApplication.mainJOSM(MainApplication.java:957)
	at org.openstreetmap.josm.gui.MainApplication$3.processArguments(MainApplication.java:282)
	at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:742)

[skyper]

The main reason seems to be that the scripting plugin is not compatible with java 8, atm.

@ralph.aytoun:
Your description sounds like there is another, hidden window blocking JOSM. It is probably asking to disable the plugin, please, check all windows on all screens.

[Gubaer]

Yes, starting from version 0.2.0 the plugin requires Java 11.

[taylor.smock]

@Gubaer: Can you add the manifest property Plugin-Minimum-Java-Version to your plugin? (See wiki:DevelopersGuide/DevelopingPlugins#ThemanifestfileforaJOSMplugin ).

[Gubaer]

Fixed in release ​https://github.com/Gubaer/josm-scripting-plugin/releases/tag/v0.2.1

[taylor.smock]

As an aside for ralph.aytoun:

We are intending to move to Java 11+ (see #17858), so we are recommending that users install ​Java 17+ if you are not using ​OpenWebStart (josm.jnlp) or using the installer for Windows (Windows installer).