Just tried to duplicate this and can't. Might be a Java8 bug.
Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2013-05-02 01:35:17
Last Changed Author: Don-vip
Revision: 5921
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2013-05-01 03:38:53 +0200 (Wed, 01 May 2013)
Last Changed Rev: 5921
Identification: JOSM/1.5 (5921 en) Windows 7 64-Bit
Memory Usage: 213 MB / 2730 MB (73 MB allocated, but free)
Java version: 1.7.0_21, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
VM arguments: [-Xmx3072M]
Dataset consistency test: No problems found
Plugin: ImageryCache (29484)
Plugin: OpeningHoursEditor (29435)
Plugin: buildings_tools (29435)
Plugin: mapdust (29525)
Plugin: measurement (29545)
Plugin: mirrored_download (29505)
Plugin: openstreetbugs (29435)
Plugin: osmarender (29435)
Plugin: reverter (29553)
Plugin: scripting (30300)
Plugin: turnrestrictions (29435)
Plugin: undelete (29555)
Plugin: utilsplugin2 (29435)
