8341778: Some javac tests ignore the result of JavacTask::call

[rm-gh-8]

Backporting JDK-8341778: Some javac tests ignore the result of JavacTask::call.

Multiple tests ignore the Boolean return value from JavacTask.call(), causing silent failures where tests appear to pass despite actual compilation errors. This fix adds result validation to all affected test cases.. Ran GHA Sanity Checks (passed), jtreg tier1 tests (passed) and related tests (passed) on linux-x64, linux-aarch64, macos-aarch64 and windows-x64:

(Passed) - make test-tier1
(Passed) - make test TEST=test/jdk/java/beans
(Passed) - make test TEST=test/hotspot/jtreg/vmTestbase/gc/g1/unloading

Results are attached.

linux-aarch64-jtreg-tier1.log
linux-aarch64-specific-test.log
linux-aarch64-specific-2-test.log
linux-x64-jtreg-tier1.log
linux-x64-specific-test.log
linux-x64-specific-2-test.log
macos-aarch64-jtreg-tier1.log
macos-aarch64-specific-test.log
macos-aarch64-specific-2-test.log
windows-x64-jtreg-tier1.log
windows-x64-specific-test.log
windows-x64-specific-2-test.log

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8341778 needs maintainer approval

Issue

• JDK-8341778: Some javac tests ignore the result of JavacTask::call (Bug - P3 - Requested)

Reviewing

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$ git fetch https://git.openjdk.org/jdk25u-dev.git pull/40/head:pull/40
$ git checkout pull/40

Update a local copy of the PR:
$ git checkout pull/40
$ git pull https://git.openjdk.org/jdk25u-dev.git pull/40/head

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$ git pr checkout 40

View PR using the GUI difftool:
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https://git.openjdk.org/jdk25u-dev/pull/40.diff

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[bridgekeeper]

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[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[rm-gh-8]

/approval request for backport of JDK-8341778: Some javac tests ignore the result of JavacTask::call.

The commit improves existing tests by preventing silent errors propagated in tests that use "JavacTask.call()". It doesn't introduce behavioral changes.

[openjdk]

@rm-gh-8
8341778: The approval request has been created successfully.

[mlbridge]

Webrevs

• 00: Full (080582c2)