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# Description of Changes Changes - Use 127.0.0.1 instead of localhost for the local backend. The bundled backend starts on a random port and binds the IPv4 wildcard, but the frontend health-checked http://localhost:{port}. On macOS (and some Linux) localhost resolves to IPv6 ::1 first, so the connection is refused and every backend-dependent tool shows "backend offline" even though the backend started fine. Switched getBackendUrl() and the health-check URL to the 127.0.0.1 loopback literal (already in the Tauri HTTP capability allowlist, and what the OAuth loopback server already uses). Client-side tools were unaffected, which matches the reports. - Fail the desktop build when the bundled JRE is older than the app JAR. The app JAR is compiled for Java 25, but the bundle could ship an older runtime/jre (jlink:runtime short-circuits on an existing runtime, and nothing checked its version), producing UnsupportedClassVersionError at launch so the backend never starts. Added a jlink:verify task that reads the jlink release file and fails the build if the bundled JRE major is below REQUIRED_JAVA (25, kept in sync with build.gradle modernJavaVersion). It runs after the runtime is staged - including the short-circuit reuse path that lets a stale JRE slip through. Cross-platform Node script, no new dependencies. --- ## Checklist ### General - [ ] I have read the [Contribution Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md) - [ ] I have read the [Stirling-PDF Developer Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md) (if applicable) - [ ] I have read the [How to add new languages to Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md) (if applicable) - [ ] I have performed a self-review of my own code - [ ] My changes generate no new warnings ### Documentation - [ ] I have updated relevant docs on [Stirling-PDF's doc repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/) (if functionality has heavily changed) - [ ] I have read the section [Add New Translation Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags) (for new translation tags only) ### Translations (if applicable) - [ ] I ran [`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md) ### UI Changes (if applicable) - [ ] Screenshots or videos demonstrating the UI changes are attached (e.g., as comments or direct attachments in the PR) ### Testing (if applicable) - [ ] I have run `task check` to verify linters, typechecks, and tests pass - [ ] I have tested my changes locally. Refer to the [Testing Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#7-testing) for more details.