NPE in MapView.drawMapContent

[SekeRob]

Since OWS fetched this release around May 2 with simultaneously updating whatever plugin needing a refresh, JOSM just exits without any warning often after some higher mouse clicking activity, for instance double click to end a line drawing. Only today did it twice pop up an error screen which invoked this bug report. Can't tell anything more than this.

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

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2025-05-01 13:38:02 +0200 (Thu, 01 May 2025)
Revision:19396
Build-Date:2025-05-02 01:30:34
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (19396 en) Windows 10 64-Bit
OS Build number: Windows 10 Home 22H2 (19045)
Memory Usage: 2506 MB / 4084 MB (1416 MB allocated, but free)
Java version: 21.0.5+11-LTS, Azul Systems, Inc., OpenJDK 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 1920x1080x32bpp@60Hz (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: UTF-8
System property sun.jnu.encoding: Cp1252
Locale info: en_US
Numbers with default locale: 1234567890 -> 1234567890
VM arguments: [-Dicedtea-web.bin.location=%UserProfile%\AppData\Local\Programs\OpenWebStart\javaws, -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:
+ Elevation (0.10.2)
+ ElevationProfile (36438)
+ FixAddresses (36438)
+ HouseNumberTaggingTool (36438)
+ KartaView (545)
+ MakeParallel (v1.1.0)
+ Mapillary (1792)
+ MicrosoftStreetside (36438)
+ OpeningHoursEditor (36438)
+ QuickLabel (23)
+ RoadSigns (36438)
+ apache-commons (36438)
+ buildings_tools (36438)
+ comfort0 (36438)
+ conflation (269)
+ contourmerge (v0.2.2)
+ easypresets (1623509627)
+ flatlaf (36438)
+ graphview (36438)
+ gridify (1743579163)
+ javafx (36438)
+ josm_magic_wand (3.0.0)
+ jts (36438)
+ libphonenumber (9.0.4)
+ measurement (36438)
+ movemembership (1.3.0)
+ notesolver (0.5.0)
+ phonenumber (1.1.1)
+ pt_assistant (656)
+ reltoolbox (36438)
+ reverter (36438)
+ routing (36438)
+ scripting (v0.3.5)
+ tageditor (36438)
+ terracer (36438)
+ todo (150)
+ turnlanes (36438)
+ turnlanes-tagging (1746100629)
+ turnrestrictions (36438)
+ undelete (36438)
+ utilsplugin2 (36438)

Tagging presets:
+ <josm.pref>/EasyPresets.xml
+ https://josm.openstreetmap.de/josmfile?page=Presets/OneClick&zip=1
+ https://raw.githubusercontent.com/osmlab/name-suggestion-index/main/dist/presets/nsi-josm-presets.min.xml
+ https://josm.openstreetmap.de/josmfile?page=Presets/Golf_Course&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/AdvertisingPreset&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Maxspeed-zones&zip=1
+ https://raw.githubusercontent.com/yopaseopor/traffic_signs_preset_JOSM/master/IT.zip
+ https://josm.openstreetmap.de/josmfile?page=Presets/Manholes&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/LaneAttributes&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/TurnLanes&zip=1
+ https://github.com/kendzi/Simple3dBuildingsPreset/releases/download/0.9_2018-05-08/s3db-preset.zip

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Potlach2_access&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Admin_Boundaries&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/AddressValidator&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Styles/PublicTransportV2&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Styles/SlovakiaBicycleRoutes&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Styles/ColorWays&zip=1
- https://josm.openstreetmap.de/josmfile?page=Rules/IncompleteObjectWarnings&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Styles/Coloured_buildings_en&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Enhanced_Lane_and_Road_Attributes&zip=1
+ https://gitlab.com/cartocite/josm-style-traffic-signs-orientation/-/raw/main/traffic_sign_orientation_style.zip
- https://josm.openstreetmap.de/josmfile?page=Styles/Modified&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Styles/MapWithAI&zip=1
+ https://raw.githubusercontent.com/yopaseopor/traffic_signs_style_JOSM/master/Styles_Traffic_signs_EUR_OC.zip
- https://josm.openstreetmap.de/josmfile?page=Styles/Maxspeed&zip=1
- https://raw.githubusercontent.com/OpenNauticalChart/josm/master/european-waterways-classification-style/CEMT-style.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/Waterways&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/NewParkingFeatures&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Styles/ParkingLanes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Coloured_Streets&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/PriorityRoad&zip=1

Last errors/warnings:
- 00189.331 W: java.io.IOException: Attribution is not loaded yet
- 00189.332 W: java.io.IOException: Attribution is not loaded yet
- 00189.334 W: java.io.IOException: Attribution is not loaded yet
- 00189.336 W: java.io.IOException: Attribution is not loaded yet
- 00189.337 W: java.io.IOException: Attribution is not loaded yet
- 00189.338 W: java.io.IOException: Attribution is not loaded yet
- 00189.339 W: java.io.IOException: Attribution is not loaded yet
- 00189.340 W: java.io.IOException: Attribution is not loaded yet
- 00470.345 E: Handled by bug report queue: java.lang.InternalError: Odd number of new curves!
- 00796.187 E: Handled by bug report queue: java.lang.NullPointerException: Cannot read the array length because "a" is null



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

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-1 (64) of JOSM
java.lang.NullPointerException: Cannot read the array length because "a" is null
	at java.base/java.util.ArrayList.addAll(ArrayList.java:754)
	at org.openstreetmap.josm.gui.MapView.drawMapContent(MapView.java:591)
	at org.openstreetmap.josm.gui.MapView.paint(MapView.java:509)
	at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:961)
	at java.desktop/javax.swing.JComponent.paint(JComponent.java:1137)
	at java.desktop/javax.swing.JComponent.paintToOffscreen(JComponent.java:5318)
	at java.desktop/javax.swing.RepaintManager$PaintManager.paintDoubleBufferedImpl(RepaintManager.java:1656)
	at java.desktop/javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1631)
	at java.desktop/javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1569)
	at java.desktop/javax.swing.RepaintManager.paint(RepaintManager.java:1336)
	at java.desktop/javax.swing.JComponent._paintImmediately(JComponent.java:5266)
	at java.desktop/javax.swing.JComponent.paintImmediately(JComponent.java:5076)
	at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:878)
	at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:861)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:861)
	at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:834)
	at java.desktop/javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:784)
	at java.desktop/javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1897)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:720)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:714)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
	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)

[stoecker]

In 19403/josm:

fix #24299 - do zero check

[stoecker]

Don't know if it will help, but I added an check to prevent calling the function with 0 entries.