Unexpected exception at startup.

[mapper377]

What steps will reproduce the problem?

1. Click on the josm-tested-11369.jar icon to invoke JOSM. Mac OS X 10.10.5. Java version 1.8.0_121.
2. I cannot reproduce the bug.

What is the expected result?

JOSM should start normally, which did not happen on this invocation.

What happens instead?

A window appeared titled "You have encountered a bug in JOSM". It offered a choice to report the bug, and this is the report.
I cannot report the behavior after invoking JOSM because I stepped away from the computer while the statup process was running. I found the "You have encountered a bug in JOSM" window" only after i returned a few minutes later.

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

I then quit JOSM and invoked it again. JOSM then started normally.

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2017-02-26 23:10:22 +0100 (Sun, 26 Feb 2017)
Build-Date:2017-02-26 22:34:39
Revision:11639
Relative:URL: ^/trunk

Identification: JOSM/1.5 (11639 en) Mac OS X 10.10.5
Memory Usage: 452 MB / 2276 MB (223 MB allocated, but free)
Java version: 1.8.0_121-b13, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: Display 69522572 1920x1200
Maximum Screen Size: 1920x1200

Plugins:
+ Mapillary (v1.4.0)
+ apache-commons (32994)
+ apache-http (32699)
+ buildings_tools (33004)
+ editgpx (33004)
+ utilsplugin2 (33124)

Last errors/warnings:
- E: java.lang.reflect.InvocationTargetException. Cause: java.lang.NullPointerException
- 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 (19) of main
java.lang.NullPointerException
	at javax.swing.BoxLayout.preferredLayoutSize(BoxLayout.java:302)
	at javax.swing.JToolBar$DefaultToolBarLayout.preferredLayoutSize(JToolBar.java:771)
	at java.awt.Container.preferredSize(Container.java:1796)
	at java.awt.Container.getPreferredSize(Container.java:1780)
	at javax.swing.JComponent.getPreferredSize(JComponent.java:1664)
	at java.awt.BorderLayout.layoutContainer(BorderLayout.java:815)
	at java.awt.Container.layout(Container.java:1510)
	at java.awt.Container.doLayout(Container.java:1499)
	at java.awt.Container.validateTree(Container.java:1695)
	at java.awt.Container.validateTree(Container.java:1704)
	at java.awt.Container.validateTree(Container.java:1704)
	at java.awt.Container.validateTree(Container.java:1704)
	at java.awt.Container.validate(Container.java:1630)
	at java.awt.Window.dispatchEventImpl(Window.java:2744)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
	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:80)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
	at java.awt.EventQueue$4.run(EventQueue.java:731)
	at java.awt.EventQueue$4.run(EventQueue.java:729)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	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)

[stoecker]

If it happens again or is reproducible please reopen/report again. The error seems to be a plain Java issue. It may be caused by an error in JOSM, but there is not much we can do with above details.

[Don-vip]

Closed as duplicate of #13100.