macOS appbundler limitation means Oracle JDK 8 is mandatory

[joewiz]

What is the problem

eXist uses appbundler for the macOS .app distribution. The appbundler's launch method used by eXist has a hidden dependency on Oracle JDK 8 and will thus prevent eXist from launching without it. This has affected eXist since v3.0.4, if not earlier versions.

I've submitted a PR to appbundler fixing the issue: https://bitbucket.org/infinitekind/appbundler/pull-requests/55. There's no ETA for this merge, but I hope it is in time for the release of 4.7.0 and 5.0.0-RC8. Once it is merged in, the mavenized branch of eXist will immediately pick it up, but the develop-4.x branch will need its tools/appbundler jar to be updated. I can do this as I did with #2187.

Update (2019-05-31): My PR to appbundler has been merged, so I've now submitted a corresponding PR for develop-4.x.x, #2768 - an important bugfix for users of 4.x.

Context information

• eXist-db version + Git Revision hash: all since v3.0.4, if not earlier versions
• Java version: all
• Operating system: macOS
• 32 or 64 bit: 64 bit
• How is eXist-db installed? DMG or locally built .app
• Any custom changes in e.g. conf.xml: none

[adamretter]

@joewiz Actually for the Mavenized branch we will need a new version of the appbundler-maven-plugin

[joewiz]

@adamretter I've submitted a PR for develop-4.x.x systems. I'm not sure what actions are needed for appbundler-maven-plugin to ensure this change is propagated to develop?

[adamretter]

@joewiz I have published updated releases of the AppBundler, and the PRs to update eXist-db are here: #2769 and #2770

[joewiz]

My PR #2768 in fact contained a regression in recent commits to appbundler. I've reported this bug to the upstream project and will submit a revised PR for 4.x.x when appbundler is fixed.

[adamretter]

@joewiz Do we still need an update?

[joewiz]

@adamretter No, I think we're all set now:

• develop: Bump appbundler-maven-plugin from 1.0.1 to 1.0.4 #2790
• develop-5.0.0: (5.0.0) Bump appbundler-maven-plugin from 1.0.1 to 1.0.4 #2793
• develop-4.x.x: (4.x.x) Follow-on fix for macOS startup w/o Oracle JDK 8 #2794