NoSuchFieldError using Contourmerge Plugin

[mdk]

What steps will reproduce the problem?

1. Install Contourmerge plugin (no restart requested, but dib't work)
2. Restart JOSM
3. Try to use Plugin

What is the expected result?

Plugin is working

What happens instead?

NoSuchFieldError and Dialog to disable Plugin.

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

It looks like the eroor didn't occur on windows.
If I didn't disable the dialog, more errors occure.

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2021-05-13 19:28:55 +0200 (Thu, 13 May 2021)
Revision:17892
Build-Date:2021-05-14 01:31:02
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (17892 en) Linux Ubuntu 20.10
Memory Usage: 491 MB / 1980 MB (192 MB allocated, but free)
Java version: 15.0.3+3-Ubuntu-120.10, Private Build, OpenJDK 64-Bit Server VM
Look and Feel: javax.swing.plaf.metal.MetalLookAndFeel
Screen: :0.0 3840×2160 (scaling 2.00×2.00)
Maximum Screen Size: 3840×2160
Best cursor sizes: 16×16→16×16, 32×32→32×32
Environment variable LANG: de_CH.UTF-8
System property file.encoding: UTF-8
System property sun.jnu.encoding: UTF-8
Locale info: en_CH
Numbers with default locale: 1234567890 -> 1234567890
Desktop environment: ubuntu:GNOME
Java ATK Wrapper package: libatk-wrapper-java:all-0.38.0-1
libcommons-compress-java: libcommons-compress-java:all-1.20-1
libcommons-logging-java: libcommons-logging-java:all-1.2-2
fonts-noto: fonts-noto:all-20200323-1build1
VM arguments: [--add-modules=java.scripting,java.sql, -Djosm.restart=true, -Djosm.dir.name=JOSM-latest, -Djava.net.useSystemProxies=true]
Dataset consistency test: No problems found

Plugins:
+ FastDraw (35640)
+ HouseNumberTaggingTool (35640)
+ OpeningHoursEditor (35640)
+ RoadSigns (35640)
+ SimplifyArea (35640)
+ apache-commons (35524)
+ apache-http (35589)
+ buildings_tools (35740)
+ contourmerge (v0.1.6)
+ imagery-xml-bounds (35723)
+ imagery_offset_db (35640)
+ jna (35662)
+ pbf (35720)
+ poly (35640)
+ public_transport (35640)
+ reltoolbox (35640)
+ reverter (35732)
+ terracer (35640)
+ turnrestrictions (35640)
+ utilsplugin2 (35691)
+ wikipedia (1.1.4)

Tagging presets:
+ https://josm.openstreetmap.de/josmfile?page=Presets/OneClick&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/LaneAttributes&preset&zip=1

Map paint styles:
+ https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Styles/Maxspeed&style&zip=1

Last errors/warnings:
- 00030.783 E: Handled by bug report queue: java.lang.NoSuchFieldError: way



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

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-0 (20) of main
java.lang.NoSuchFieldError: way
	at org.openstreetmap.josm.plugins.contourmerge.ContourMergeModel.getWaySliceFromSelectedNodes(ContourMergeModel.java:280)
	at org.openstreetmap.josm.plugins.contourmerge.ContourMergeModel.getDragSource(ContourMergeModel.java:375)
	at org.openstreetmap.josm.plugins.contourmerge.ContourMergeView.lambda$paint$11(ContourMergeView.java:358)
	at java.base/java.util.Optional.ifPresent(Optional.java:176)
	at org.openstreetmap.josm.plugins.contourmerge.ContourMergeView.paint(ContourMergeView.java:355)
	at org.openstreetmap.josm.gui.MapView.drawTemporaryLayers(MapView.java:650)
	at org.openstreetmap.josm.gui.MapView.drawMapContent(MapView.java:587)
	at org.openstreetmap.josm.gui.MapView.paint(MapView.java:490)
	at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:907)
	at java.desktop/javax.swing.JComponent.paint(JComponent.java:1083)
	at java.desktop/javax.swing.JComponent.paintToOffscreen(JComponent.java:5255)
	at java.desktop/javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:246)
	at java.desktop/javax.swing.RepaintManager.paint(RepaintManager.java:1323)
	at java.desktop/javax.swing.JComponent._paintImmediately(JComponent.java:5203)
	at java.desktop/javax.swing.JComponent.paintImmediately(JComponent.java:5013)
	at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:865)
	at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:848)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:848)
	at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:823)
	at java.desktop/javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:772)
	at java.desktop/javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1884)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:316)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

[mdk]

The problem didn't occur on stable version r17833:

Identification: JOSM/1.5 (17833 en) Linux Ubuntu 20.10
Memory Usage: 584 MB / 1980 MB (137 MB allocated, but free)
Java version: 15.0.3+3-Ubuntu-120.10, Private Build, OpenJDK 64-Bit Server VM
Look and Feel: javax.swing.plaf.metal.MetalLookAndFeel
Screen: :0.0 3840×2160 (scaling 2.00×2.00)
Maximum Screen Size: 3840×2160
Best cursor sizes: 16×16→16×16, 32×32→32×32
Environment variable LANG: de_CH.UTF-8
System property file.encoding: UTF-8
System property sun.jnu.encoding: UTF-8
Locale info: en_CH
Numbers with default locale: 1234567890 -> 1234567890
Desktop environment: ubuntu:GNOME
Java ATK Wrapper package: libatk-wrapper-java:all-0.38.0-1
libcommons-compress-java: libcommons-compress-java:all-1.20-1
libcommons-logging-java: libcommons-logging-java:all-1.2-2
fonts-noto: fonts-noto:all-20200323-1build1
VM arguments: [--add-modules=java.scripting,java.sql, -Djosm.restart=true, -Djava.net.useSystemProxies=true]
Dataset consistency test: No problems found

Plugins:
+ OpeningHoursEditor (35640)
+ apache-commons (35524)
+ apache-http (35589)
+ buildings_tools (35740)
+ contourmerge (v0.1.6)
+ imagery-xml-bounds (35723)
+ imagery_offset_db (35640)
+ javafx-unixoid (35655)
+ jna (35662)
+ pbf (35720)
+ poly (35640)
+ reltoolbox (35640)
+ reverter (35732)
+ terracer (35640)
+ utilsplugin2 (35691)

[skyper]

Similar: #20876

[taylor.smock]

PR made: ​https://github.com/Gubaer/josm-contourmerge-plugin/pull/25

[taylor.smock]

This was merged and released in ​v1.0.7.