Bug#1118400: josm just shows a blank window

[Martin Dosch]

Package: josm
Version: 0.0.svn19439+dfsg-1
Severity: important

Dear Maintainer,

when starting josm (on debian testing with some packages from sid, 
running sway) I only see a blank window (see attached screenshot).
When running from the terminal I only see:

```
josm
Using /usr/lib/jvm/java-21-openjdk-amd64/bin/java to execute josm.
2025-10-19 12:28:28.911 INFORMATION: Protokollierungsgrad ist bei INFORMATION (INFO, 800)
2025-10-19 12:28:29.773 INFORMATION: Nutzbares IPv6-Netzwerk erkannt, IPv6 wird nach dem nächsten Neustart gegenüber IPv4 bevorzugt.
2025-10-19 12:28:32.849 INFORMATION: 182 Tag2Link Regeln wurden von resource://META-INF/resources/webjars/tag2link/2025.7.21/index.json bezogen
2025-10-19 12:28:35.814 INFORMATION: Could not load tool definition splitway
2025-10-19 12:28:36.051 INFORMATION: Changeset updater active (checks every 60 minutes if open changesets have been closed)
```

Best regards,
Martin

-- System Information:
Debian Release: forky/sid
  APT prefers testing
  APT policy: (900, 'testing'), (600, 'unstable'), (500, 'unstable-debug'), (500, 'testing-debug'), (500, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.16.9+deb14-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages josm depends on:
ii  default-jre [java11-runtime]     2:1.21-76
ii  fonts-noto                       20201225-2
ii  jmapviewer                       2.25+dfsg-1
ii  libgettext-commons-java          0.9.8-1
ii  openjdk-17-jre [java11-runtime]  17.0.17~8ea-1
ii  openjdk-21-jre [java11-runtime]  21.0.9~8ea-1
ii  proj-data                        9.7.0-1

Versions of packages josm recommends:
ii  josm-l10n  0.0.svn19439+dfsg-1
ii  openjfx    11.0.11+1-7

josm suggests no packages.

-- no debconf information
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