MR plug in not downloading tasks

[anonymous]

What steps will reproduce the problem?

1. Hit MR Download Data button
2. Select button to update MR plugin

What is the expected result?

MR tasks show up in JOSM view window and in MR list of tasks

What happens instead?

Unexpected exception pops up to update the MR plug in.
Unexpected exception window pops up that there is a bug in JOSM and that I need to most recent of JOSM.
JOSM indicates that I have the most recent MR plugin and most recent JOSM update.
I have rest the API key in the MR website but that doesn't help.

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

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2026-03-28 20:28:41 +0100 (Sat, 28 Mar 2026)
Revision:19555
Build-Date:2026-03-29 01:30:57
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (19555 en) Mac OS X 26.5
OS Build number: macOS 26.5 (25F71)
Memory Usage: 840 MB / 8192 MB (373 MB allocated, but free)
Java version: 21.0.11+10-LTS, Azul Systems, Inc., OpenJDK 64-Bit Server VM
Look and Feel: com.apple.laf.AquaLookAndFeel
Screen: Display 1 1728x1117x32bpp@120Hz (scaling 2.00×2.00) Display 2 1920x1080x32bpp@60Hz (scaling 1.00×1.00) Display 3 1920x1080x32bpp@60Hz (scaling 1.00×1.00)
Maximum Screen Size: 1920×1117
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
VM arguments: [-Djava.util.Arrays.useLegacyMergeSort=true, --add-reads=java.base=ALL-UNNAMED,java.desktop, --add-reads=java.desktop=ALL-UNNAMED,java.naming, --add-reads=java.naming=ALL-UNNAMED,java.desktop, --add-exports=java.desktop/sun.awt=ALL-UNNAMED,java.desktop, --add-exports=java.desktop/javax.jnlp=ALL-UNNAMED,java.desktop, --add-exports=java.base/com.sun.net.ssl.internal.ssl=ALL-UNNAMED,java.desktop, --add-exports=java.base/sun.net.www.protocol.jar=ALL-UNNAMED,java.desktop, --add-exports=java.base/sun.security.action=ALL-UNNAMED,java.desktop, --add-exports=java.base/sun.security.provider=ALL-UNNAMED,java.desktop, --add-exports=java.base/sun.security.util=ALL-UNNAMED,java.desktop, --add-exports=java.base/sun.security.validator=ALL-UNNAMED,java.desktop, --add-exports=java.base/sun.security.x509=ALL-UNNAMED,java.desktop, --add-exports=java.base/jdk.internal.util.jar=ALL-UNNAMED,java.desktop, --add-exports=java.base/sun.net.www.protocol.http=ALL-UNNAMED,java.desktop, --add-exports=java.desktop/sun.awt.X11=ALL-UNNAMED,java.desktop, --add-exports=java.desktop/sun.applet=ALL-UNNAMED,java.desktop,jdk.jsobject, --add-exports=java.naming/com.sun.jndi.toolkit.url=ALL-UNNAMED,java.desktop, --add-modules=java.scripting,java.sql,javafx.controls,javafx.media,javafx.swing,javafx.web, --add-exports=java.desktop/com.apple.eawt=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED, --add-exports=javafx.graphics/com.sun.javafx.application=ALL-UNNAMED, --add-exports=jdk.deploy/com.sun.deploy.config=ALL-UNNAMED, --add-opens=java.base/java.lang=ALL-UNNAMED, --add-opens=java.base/java.nio=ALL-UNNAMED, --add-opens=java.base/jdk.internal.loader=ALL-UNNAMED, --add-opens=java.base/jdk.internal.ref=ALL-UNNAMED, --add-opens=java.desktop/javax.imageio.spi=ALL-UNNAMED, --add-opens=java.desktop/javax.swing.text.html=ALL-UNNAMED, --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED, -Djava.security.manager=allow]
Dataset consistency test: No problems found

Plugins:
+ MapRoulette (83)
+ Mapillary (1819)
+ MicrosoftStreetside (36474)
+ apache-commons (36474)
+ apache-http (36474)
+ buildings_tools (36474)
+ changessum (v0.1.1)
+ easypresets (1623509627)
+ ext_tools (36474)
+ flatlaf (36474)
+ graphview (36474)
+ javafx (36474)
+ jna (36474)
+ mapwithai (839)
+ markseen (182)
+ measurement (36474)
+ osm-obj-info (72)
+ pmtiles (36474)
+ reverter (36474)
+ scripting (v0.4.2)
+ utilsplugin2 (36497)

Tagging presets:
+ ${HOME}/Downloads/JOSM Setup files/FB_presets.max.xml
+ <josm.userdata>/EasyPresets.xml

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/Modified&zip=1
- ${HOME}/Downloads/FBedits.mapcss
- ${HOME}/Downloads/JOSM Setup files/FB_style.mapcss
+ https://raw.githubusercontent.com/KaartGroup/Kaart-Styles/master/Kaart-Styles.mapcss
+ https://josm.openstreetmap.de/josmfile?page=Styles/SidewalksAndFootways&zip=1
- ${HOME}/Downloads/Kaart-Styles.mapcss
- ${HOME}/Downloads/Layer_checker.mapcss
- ${HOME}/Downloads/feature_owner_style.mapcss
- ${HOME}/Downloads/feature_age_style.mapcss
- ${HOME}/Downloads/JOSM Setup files/rainbow_roads.mapcss
- ${HOME}/Downloads/JOSM Setup files/FB_presets.max.xml
- ${HOME}/Downloads/JOSM Setup files/FB_rules5.14.validator.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/MapWithAI&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Styles/SidewalksAndFootways&zip=1

Last errors/warnings:
- 00101.102 E: Failed to locate image 'icons/emergency_hydrant.n.16.png'
- 00101.102 E: Failed to locate image 'icons/transport_bus_stop2.n.16.png'
- 00101.103 E: Failed to locate image 'icons/transport_bus_stop2.n.16.png'
- 00101.103 E: Failed to locate image 'icons/emergency_hydrant.n.16.png'
- 00101.104 E: Failed to locate image 'icons/transport_bus_stop2.n.16.png'
- 00101.105 E: Failed to locate image 'icons/emergency_hydrant.n.16.png'
- 00101.106 E: Failed to locate image 'icons/transport_bus_stop2.n.16.png'
- 00101.106 E: Failed to locate image 'icons/transport_bus_stop2.n.16.png'
- 00110.001 E: Handled by bug report queue: java.lang.ClassCastException: class org.eclipse.parsson.JsonObjectBuilderImpl$JsonObjectImpl cannot be cast to class jakarta.json.JsonString (org.eclipse.parsson.JsonObjectBuilderImpl$JsonObjectImpl and jakarta.json.JsonString are in unnamed module of loader net.sourceforge.jnlp.runtime.classloader.JNLPClassLoader @20f8a61d)
- 00200.588 E: Handled by bug report queue: java.lang.ClassCastException: class org.eclipse.parsson.JsonObjectBuilderImpl$JsonObjectImpl cannot be cast to class jakarta.json.JsonString (org.eclipse.parsson.JsonObjectBuilderImpl$JsonObjectImpl and jakarta.json.JsonString are in unnamed module of loader net.sourceforge.jnlp.runtime.classloader.JNLPClassLoader @20f8a61d)



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

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-1 (49) of JOSM
java.lang.ClassCastException: class org.eclipse.parsson.JsonObjectBuilderImpl$JsonObjectImpl cannot be cast to class jakarta.json.JsonString (org.eclipse.parsson.JsonObjectBuilderImpl$JsonObjectImpl and jakarta.json.JsonString are in unnamed module of loader net.sourceforge.jnlp.runtime.classloader.JNLPClassLoader @20f8a61d)
	at org.eclipse.parsson.JsonObjectBuilderImpl$JsonObjectImpl.getJsonString(JsonObjectBuilderImpl.java:244)
	at org.eclipse.parsson.JsonObjectBuilderImpl$JsonObjectImpl.getString(JsonObjectBuilderImpl.java:249)
	at org.openstreetmap.josm.plugins.maproulette.api.parsers.ClusteredPointParser.parse(ClusteredPointParser.java:69)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at org.eclipse.parsson.JsonParserImpl$1.tryAdvance(JsonParserImpl.java:203)
	at java.base/java.util.Spliterator.forEachRemaining(Spliterator.java:332)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:575)
	at java.base/java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260)
	at java.base/java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:616)
	at org.openstreetmap.josm.plugins.maproulette.api.parsers.ClusteredPointParser.parse(ClusteredPointParser.java:45)
	at org.openstreetmap.josm.plugins.maproulette.api.TaskAPI.box(TaskAPI.java:94)
	at org.openstreetmap.josm.plugins.maproulette.actions.downloadtasks.MapRouletteDownloadTaskBox$DownloadTask.realRun(MapRouletteDownloadTaskBox.java:87)
	at org.openstreetmap.josm.gui.PleaseWaitRunnable.doRealRun(PleaseWaitRunnable.java:94)
	at org.openstreetmap.josm.gui.PleaseWaitRunnable.run(PleaseWaitRunnable.java:142)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.base/java.lang.Thread.run(Thread.java:1583)

[GerdP]

Closed as duplicate of #24760.