Check for Java 17 toolchain and fail if not found

[bogdandrutu]

You cannot build unless java17 is installed, see https://github.com/open-telemetry/opentelemetry-java/blob/main/buildSrc/build.gradle.kts#L69

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: bogdandrutu / name: Bogdan Drutu (8ca11c3)
• ✅ login: jack-berg (c961087)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.04%. Comparing base (b2298ab) to head (c961087).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #6303   +/-   ##
=========================================
  Coverage     91.04%   91.04%           
  Complexity     5726     5726           
=========================================
  Files           625      625           
  Lines         16744    16744           
  Branches       1713     1713           
=========================================
  Hits          15244    15244           
  Misses         1006     1006           
  Partials        494      494           

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[breedx-splk]

Yeah, we don't want to break users who are already on 21.

[jack-berg]

I've pushed a commit which reflects this recommendation: #6303 (comment)

Updated the PR title

[jord1e]

Hi, here from the release notes.

You can actually configure Gradle to install the JDK version that is not present (17 in this case) when it is not found on the local system, this is a better experience than erroring and was the default up to Gradle 7.x or so.
You can keep the check in this PR for sanity.

Just edit settings.gradle(.kts) [NOT build.gradle(.kts)] and add this one line plugin. Here is a snippet:

plugins {
    id 'org.gradle.toolchains.foojay-resolver-convention' version '0.8.0'
}

rootProject.name = 'xxx'

See the official docs: https://docs.gradle.org/current/userguide/toolchains.html#sec:provisioning