Release from Java 8 build

[ssoloff]

Fixes #2801.

The Java 9 build seems to have some backwards incompatibilities when targetting Java 8.

EDIT: Actually, the problem appears to be because we're not specifying a Java 8 boot classpath when using JDK 9 to build for Java 8.

[ron-murhammer]

@ssoloff Correct, the issue is not specifying a Java 8 boot classpath which means we aren't guaranteed that the proper libraries are available at runtime when using Java 8. I'm gonna merge this to fix the latest release.

[codecov-io]

Codecov Report

Merging #2802 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2802   +/-   ##
=========================================
  Coverage     20.12%   20.12%           
  Complexity     5748     5748           
=========================================
  Files           815      815           
  Lines         73285    73285           
  Branches      12153    12153           
=========================================
  Hits          14750    14750           
  Misses        56428    56428           
  Partials       2107     2107

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