Getting an error report opening JOSM, not sure what the cause is.

[hairyhaggis]

What steps will reproduce the problem?

1. Open JOSM, bring in data from tasking manager

What is the expected result? JOSM to open normally

What happens instead? Error report generated, i can exit out and continue though, it doesnt stop/block my access

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: 2020-11-15 19:47:37 +0100 (Sun, 15 Nov 2020)
Build-Date:2020-11-15 18:50:11
Revision:17313
Relative:URL: ^/trunk

Identification: JOSM/1.5 (17313 en) Mac OS X 10.16
OS Build number: macOS 11.0.1 (20B29)
Memory Usage: 903 MB / 1820 MB (397 MB allocated, but free)
Java version: 1.8.0_261-b12, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Look and Feel: com.formdev.flatlaf.FlatDarculaLaf
Screen: Display 188945227 1920x1080 (scaling 1.0x1.0), Display 69943696 2048x1152 (scaling 1.0x1.0), Display 1007470786 1920x1080 (scaling 1.0x1.0)
Maximum Screen Size: 2048x1152
Best cursor sizes: 16x16 -> 16x16, 32x32 -> 32x32
VM arguments: [-Djava.security.policy=file:<java.home>/lib/security/javaws.policy, -DtrustProxy=true, -Djnlpx.home=<java.home>/bin, -Djava.security.manager, -Djnlpx.origFilenameArg=${HOME}/Library/Application Support/Oracle/Java/Deployment/cache/6.0/31/583aa85f-515f86a1, -Djnlpx.remove=false, -Dsun.awt.warmup=true, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlpx.heapsize=NULL,2048m, -Dmacosx.jnlpx.dock.name=JOSM (development version), -Dmacosx.jnlpx.dock.icon=${HOME}/Library/Application Support/Oracle/Java/Deployment/cache/6.0/25/4c122699-5f3ee590.icns, -Djnlp.application.href=https://josm.openstreetmap.de/download/josm-latest.jnlp , -Djnlpx.jvm="<java.home>/bin/java"]
Dataset consistency test: No problems found

Plugins:
+ FastDraw (35640)
+ Mapillary (1.5.27)
+ apache-commons (35524)
+ apache-http (35589)
+ auto_tools (73)
+ buildings_tools (35640)
+ flatlaf (35589)
+ graphview (35640)
+ imagery_offset_db (35640)
+ javafx-osx (35458)
+ jna (35458)
+ jts (35458)
+ markseen (14)
+ osm-obj-info (56)
+ rex (53)
+ scripting (30798)
+ tageditor (35640)
+ turnlanes-tagging (288)
+ turnrestrictions (35640)
+ utilsplugin2 (35624)

Map paint styles:
+ https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
+ https://raw.githubusercontent.com/KaartGroup/Kaart-Styles/master/Kaart-Styles.mapcss
+ https://raw.githubusercontent.com/KaartGroup/Kaart-Styles/master/Overlapping%20Ways.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/Coloured_Streets&zip=1
- ${HOME}/Downloads/MX_Import Test .mapcss
- https://raw.githubusercontent.com/KaartGroup/Kaart-Styles/master/Kaart_QC_Quandary.mapcss

Validator rules:
+ https://raw.githubusercontent.com/KaartGroup/KaartValidator/master/kaart.clingstone.validator.mapcss
- https://raw.githubusercontent.com/KaartGroup/KaartValidator/master/kaart.durazno.validator.mapcss

Last errors/warnings:
- 00014.961 E: Handled by bug report queue: java.lang.NullPointerException


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

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-2 (39) of javawsApplicationThreadGroup
java.lang.NullPointerException
	at javax.swing.TransferHandler$DropHandler.drop(TransferHandler.java:1521)
	at java.awt.dnd.DropTarget.drop(DropTarget.java:455)
	at javax.swing.TransferHandler$SwingDropTarget.drop(TransferHandler.java:1282)
	at sun.awt.dnd.SunDropTargetContextPeer.processDropMessage(SunDropTargetContextPeer.java:538)
	at sun.lwawt.macosx.CDropTargetContextPeer.processDropMessage(CDropTargetContextPeer.java:143)
	at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchDropEvent(SunDropTargetContextPeer.java:852)
	at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(SunDropTargetContextPeer.java:776)
	at sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:48)
	at java.awt.Component.dispatchEventImpl(Component.java:4744)
	at java.awt.Container.dispatchEventImpl(Container.java:2297)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4904)
	at java.awt.LightweightDispatcher.processDropTargetEvent(Container.java:4609)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4471)
	at java.awt.Container.dispatchEventImpl(Container.java:2283)
	at java.awt.Window.dispatchEventImpl(Window.java:2746)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:84)
	at java.awt.EventQueue$4.run(EventQueue.java:733)
	at java.awt.EventQueue$4.run(EventQueue.java:731)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:730)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

[Don-vip]

Can't reproduce, and Java 8 bug reports on macOS are not worth spending much time on them as we're migrating to Java 15 builds, please try the new packages at ​https://github.com/openstreetmap/josm/releases.