[bugfix] macOS .app: accept Java 21+ for JVM discovery#6436
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The appbundler-maven-plugin writes <jvmRequired> verbatim into the
.app bundle's Info.plist as JVMVersion. Apple's JavaAppLauncher uses
that key (and the convention "<major>+") to gate which installed JVM
it will use to launch the app. With <jvmRequired>21</jvmRequired> the
launcher's plist contains JVMVersion = 21 (a strict match), so a
host with only Java 22 / 23 / 24 / … installed would be rejected even
though eXist runs fine on those.
Switch to "21+" — matches the established Apple convention (1.6+,
1.7+, 1.8+, …) and lines up with how Zulu / Temurin / Liberica / Apple
JDKs all install their major-version directories. Verified the plugin
propagates the literal:
/usr/libexec/PlistBuddy -c "Print :JVMVersion" Contents/Info.plist
# 21+
Follow-up to @duncdrum review on PR eXist-db#6434 (eXist-db#6434 (comment)).
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[This PR was co-authored with Claude Code. -Joe]
Summary
The macOS
.appbundle'sInfo.plistJVMVersionkey currently reads21(literal). Apple'sJavaAppLauncherinterprets that as a strict match: hosts that only have Java 22 / 23 / 24 installed would be rejected even though eXist runs fine on those. Switch to21+— the established Apple-convention "this major or later" form (1.6+,1.7+,1.8+, …) — so the launcher picks up any JDK ≥ 21.Follow-up to @duncdrum's review on PR #6434 (#6434 (comment)), where he flagged the same JVM-discoverability concern.
What changed
exist-distribution/pom.xml, line 926:<jvmRequired>21</jvmRequired>→<jvmRequired>21+</jvmRequired>.The
appbundler-maven-pluginpropagates this value intoInfo.plistverbatim as a string, so the+reaches the launcher with no further plumbing.Verification
End-to-end JVM-discovery testing against the various JDK distributions @duncdrum mentioned (Zulu / Temurin / system-default) needs the full signed-and-notarized DMG pipeline, which happens on a release cut — so the "would Zulu have been discovered before this change?" question is best answered against the next beta DMG.
Related
JavaAppLauncherconvention forJVMVersion: trailing+denotes "this version or later"