Bug#838247: josm: Help->Help gives "an unexpected exception occurred"

[Akkana Peck]

Package: josm
Version: 0.0.svn10966+dfsg-1
Severity: normal

First time I've run josm. I loaded a gpx trace from a local file,
then couldn't figure out how to log in to OSM and edit the map to
add my trace, so I tried Help->Help, and got a window saying:

An unexpected exception occurred.
This is always a coding error. If you are running the latest version
of JOSM, please being kind and file a bug report. See
https://bugs.debuan.org for a guide how to do this.

It does say my JOSM is up to date, so I'm filing a bug as requested.

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 4.3.0-1-686 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages josm depends on:
ii  default-jre [java8-runtime]      2:1.8-57
ii  fonts-noto                       20160724-1
ii  jmapviewer                       2.0+dfsg-1
ii  libcommons-compress-java         1.11-1
ii  libcommons-logging-java          1.2-1
ii  libgettext-commons-java          0.9.6-3
ii  liboauth-signpost-java           1.2.1.2-1.5
ii  libsvgsalamander-java            1.1.1+dfsg-1
ii  openjdk-8-jre [java8-runtime]    8u102-b14.1-2
ii  openstreetmap-map-icons-classic  1:0.0.svn32805-1

Versions of packages josm recommends:
pn  josm-l10n                           <none>
ii  josm-plugins                        0.0.svn32928+ds-1
pn  webkit-image-gtk | webkit-image-qt  <none>

josm suggests no packages.

-- no debconf information