NPE in Changesetmanager when trying to sort by e.g. "created at"

[GerdP]

What steps will reproduce the problem?

1. Upload a few changesets
2. open Changeset Manager window
3. click on column header "Created at"

What is the expected result?

What happens instead?

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

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2025-08-31 14:19:57 +0200 (Sun, 31 Aug 2025)
Revision:19439
Build-Date:2025-09-02 01:30:58
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (19439 en) Windows 10 64-Bit
OS Build number: Windows 10 Home 22H2 (19045)
Memory Usage: 2016 MB / 2016 MB (407 MB allocated, but free)
Java version: 17.0.5+8-LTS, Azul Systems, Inc., OpenJDK 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 1920x1080x32bpp@60Hz (scaling 1.50×1.50)
Maximum Screen Size: 1920×1080
Best cursor sizes: 16×16→48×48, 32×32→48×48
System property file.encoding: Cp1252
System property sun.jnu.encoding: Cp1252
Locale info: en_DE
Numbers with default locale: 1234567890 -> 1234567890
VM arguments: [-Dsun.java2d.uiScale=1.5, -Djpackage.app-version=1.5.18622, --add-modules=java.scripting,java.sql,javafx.controls,javafx.media,javafx.swing,javafx.web, --add-exports=java.base/sun.security.action=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.spi=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, -Djpackage.app-path=%UserProfile%\AppData\Local\JOSM\HWConsole.exe]

Plugins:
+ OpeningHoursEditor (36438)
+ buildings_tools (36438)
+ measurement (36438)
+ o5m (36438)
+ poly (36438)
+ reverter (36447)
+ terracer (36438)
+ undelete (36438)
+ utilsplugin2 (36438)

Tagging presets:
+ d:\josm\core\resources\data\defaultpresets.xml

Last errors/warnings:
- 629759.408 W: Not downloading all tiles because there are more than 40 tiles on an axis!
- 629759.519 W: Not downloading all tiles because there are more than 40 tiles on an axis!
- 629759.521 W: Not downloading all tiles because there are more than 40 tiles on an axis!
- 629762.021 W: Not downloading all tiles because there are more than 40 tiles on an axis!
- 629762.022 W: Not downloading all tiles because there are more than 40 tiles on an axis!
- 629763.199 W: Not downloading all tiles because there are more than 40 tiles on an axis!
- 629763.202 W: Not downloading all tiles because there are more than 40 tiles on an axis!
- 717526.316 E: Handled by bug report queue: java.lang.NullPointerException: Cannot invoke "java.lang.Comparable.compareTo(Object)" because the return value of "java.util.function.Function.apply(Object)" is null
- 717538.311 E: Handled by bug report queue: java.lang.NullPointerException: Cannot invoke "java.lang.Comparable.compareTo(Object)" because the return value of "java.util.function.Function.apply(Object)" is null
- 724952.068 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-0 (22) of main
java.lang.NullPointerException

[GerdP]

No idea why but the traceback was truncated. Here it is:

=== STACK TRACE ===
Thread: AWT-EventQueue-0 (22) of main
java.lang.NullPointerException: Cannot read field "seconds" because "<parameter1>" is null
	at java.base/java.time.Instant.compareTo(Unknown Source)
	at java.base/java.time.Instant.compareTo(Unknown Source)
	at java.base/java.util.Comparator.lambda$comparing$77a9974f$1(Unknown Source)
	at java.desktop/javax.swing.DefaultRowSorter.compare(Unknown Source)
	at java.desktop/javax.swing.DefaultRowSorter$Row.compareTo(Unknown Source)
	at java.desktop/javax.swing.DefaultRowSorter$Row.compareTo(Unknown Source)
	at java.base/java.util.ComparableTimSort.countRunAndMakeAscending(Unknown Source)
	at java.base/java.util.ComparableTimSort.sort(Unknown Source)
	at java.base/java.util.Arrays.sort(Unknown Source)
	at java.desktop/javax.swing.DefaultRowSorter.sort(Unknown Source)
	at java.desktop/javax.swing.DefaultRowSorter.setSortKeys(Unknown Source)
	at java.desktop/javax.swing.DefaultRowSorter.toggleSortOrder(Unknown Source)
	at java.desktop/javax.swing.plaf.basic.BasicTableHeaderUI$MouseInputHandler.mouseClicked(Unknown Source)
	at java.desktop/java.awt.AWTEventMulticaster.mouseClicked(Unknown Source)
	at java.desktop/java.awt.Component.processMouseEvent(Unknown Source)
	at java.desktop/javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.desktop/java.awt.Component.processEvent(Unknown Source)
	at java.desktop/java.awt.Container.processEvent(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
	at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.desktop/java.awt.EventQueue$5.run(Unknown Source)
	at java.desktop/java.awt.EventQueue$5.run(Unknown Source)
	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.run(Unknown Source)

[GerdP]

In 19512/josm:

fix #24632: NPE in Changesetmanager when trying to sort by e.g. "created at"

• handle null values as with "Closed at" column