8345213: JVM Prefers /etc/timezone Over /etc/localtime on Debian 12

[naotoj]

Removing the support for /etc/timezone file that is Debian distro specific. The file is no longer considered authoritative (https://wiki.debian.org/TimeZoneChanges#Check_Configured_Timezone), and in fact, it is now out of sync as the bug reports. The fix was confirmed manually on a Ubuntu 25.04.

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Issue

• JDK-8345213: JVM Prefers /etc/timezone Over /etc/localtime on Debian 12 (Bug - P4)

Reviewers

• Joe Wang (@JoeWang-Java - Reviewer)

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[openjdk]

@naotoj This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8345213: JVM Prefers /etc/timezone Over /etc/localtime on Debian 12

Reviewed-by: joehw

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At the time when this comment was updated there had been 55 new commits pushed to the master branch:

• 39cb493: 8348106: Catch C++ exception in Java_sun_awt_windows_WTaskbarPeer_setOverlayIcon
• ddb2569: 8280682: Refactor AOT code source validation checks
• 65f79c1: 8347335: ZGC: Use limitless mark stack memory
• e410af0: 8342393: Promote commutative vector IR node sharing
• f755fad: 8349653: Clarify the docs for MemorySegment::reinterpret
• a5c9a4d: 8349032: C2: Parse Predicate refactoring in Loop Unswitching broke fix for JDK-8290850
• 302bed0: 8350499: Minimal build fails with slowdebug builds
• 0795d11: 8350464: The flags to set the native priority for the VMThread and Java threads need a broader range
• 05b4812: 8350041: Skip test/jdk/java/lang/String/nativeEncoding/StringPlatformChars.java on static JDK
• a891630: 8350480: RISC-V: Relax assertion about registers in C2_MacroAssembler::minmax_fp
• ... and 45 more: https://git.openjdk.org/jdk/compare/2d03bd007895b139b027947852c8b5ad8eab49b6...master

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• 00: Full (a8894963)