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[Backport] Startup scripts: verify Java 8 (exactly), improve port/java verification messages. (#8794)#8951

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jon-wei merged 2 commits intoapache:0.16.1-incubatingfrom
jon-wei:backport-8794-to-0.16.1-incubating
Nov 27, 2019
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[Backport] Startup scripts: verify Java 8 (exactly), improve port/java verification messages. (#8794)#8951
jon-wei merged 2 commits intoapache:0.16.1-incubatingfrom
jon-wei:backport-8794-to-0.16.1-incubating

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@jon-wei jon-wei commented Nov 27, 2019

Backport of #8794 to 0.16.1-incubating

…ion messages. (apache#8794)

* Startup scripts: verify Java 8 (exactly), improve port/java verification messages.

Java 11 compatibility isn't fully baked yet (users have reported various
issues on Java 11), so block startup with an error message unless Java 8
is found. Allow overriding this decision with an environment variable.

* Message adjustments.
@jon-wei jon-wei added this to the 0.16.1 milestone Nov 27, 2019
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jon-wei commented Nov 27, 2019

TeamCity failures are unrelated, merging

@jon-wei jon-wei merged commit cd28850 into apache:0.16.1-incubating Nov 27, 2019
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