The v1.09.1 desktop release (DMG/MSI/DEB/RPM) fails to launch on every
platform with:
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.fasterxml.jackson.databind.ObjectMapper.<init>(ObjectMapper.java:700)
at com.vitorpamplona.amethyst.desktop.ui.deck.DeckState.<clinit>
Caused by: java.lang.NullPointerException:
Cannot read the array length because the return value of
"java.lang.Class.getEnumConstants()" is null
at com.fasterxml.jackson.databind.cfg.MapperConfig
.collectFeatureDefaults(MapperConfig.java:107)
Failed to launch JVM
Root cause: PR #2914 wired Compose 1.11.0's new ProGuard pass into the
release build but added only `-dontwarn` rules. ProGuard then optimized
Jackson's enum classes (`SerializationFeature`, `MapperFeature`, etc.) and
stripped their synthetic `values()` / `valueOf()` methods because nothing
in Amethyst's own bytecode calls them. Jackson does call them — but
reflectively, at `ObjectMapper` construction time, long after ProGuard
finished. The result is `Class.getEnumConstants()` returning null and the
JVM giving up.
The same regression silently broke VLC media playback (VLCj's
`ServiceLoader` lookup of `DiscoveryDirectoryProvider` impls printed
`ConfigDirConfigFileDiscoveryDirectoryProvider not found` because
ProGuard stripped both the META-INF/services file and the impl class).
Fix: add explicit `-keep` rules for the four reflection-heavy libraries
on the desktop classpath:
- Jackson (databind, core, annotations, module-kotlin): keep classes
intact and keep `values()`/`valueOf()` on every Jackson enum.
- JNA (com.sun.jna.\*\*): used by VLCj and kmp-tor — its `Structure`
field-order reflection requires field metadata to survive.
- VLCj (uk.co.caprica.vlcj.\*\*): `ServiceLoader`-based discovery providers
and reflective binding classes throughout.
- SLF4J: detected by Jackson via `Class.forName`.
Verified by building `:desktopApp:createReleaseDistributable` and
launching the resulting bundle on macOS arm64:
- No `ExceptionInInitializerError`
- `VLC: bundled discovery succeeded`
- `VLC: MediaPlayerFactory created successfully`
The same ProGuard pass runs on all four target formats (Dmg, Msi, Deb,
Rpm) so this single change fixes the regression on every desktop OS.
m
31e73e3865