Implement reflective support for Java Records (#1381)

* Standardize around JDK 8

* Update GJF to support newer JDKs

* Fix misc java 8 issues in tests

* Prepare java 16/records checking at runtime

* Implement real RecordJsonAdapter

* Spotless

* Prepare build for JDK 16+

* Fix property name for kapt

* Small cleanup

* Make FallbackEnum java-8 happy

* Remove animalsniffer

* Fix format

* Add opens for ExtendsPlatformClassWithProtectedFields

* Return null every time in shim for main tests

* Use JDK 16 + release 8 to replace animalsniffer

* Simplify accessor accessible handling

* Remove manifest attrs

* Fix typo

* Fix KCT tests + upgrade it

* Cover another

* Try explicit kotlin daemon args for java 17?

* Disable 17-ea for now until kotlin 1.5.30

* Add JsonQualifier and Json(name) tests + fix qualifiers

* Ensure constructor is accessible

* GJF it properly

* GJF 1.11

* Unwrap InvocationTargetException

* Use MethodHandle for constructor

* Use MethodHandle for accessor too

* Revert "Remove manifest attrs"

This reverts commit 3eb768fd6904bb5c979aa01c3c182e0fb9329d62.

* Proper MR jar

* *actually* fix GJF, which wasn't getting applied before

We can just enable this everywhere now since we require JDK 16 anyway

* Make IDE happy about modules access

* Fixup records tests to play nice with modules

Gotta be public

* Add complex smoke test

* Remove comment

Not a regression test in this case

.github/workflows/build.yml

@@ -10,14 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         java-version:
-          - 8
-          - 9
-          - 10
-          - 11
-          - 12
-          - 13
-          - 14
-          - 15
+          - 16
 
     steps:
       - name: Checkout
@@ -46,7 +39,7 @@ jobs:
         run: ./gradlew build check --stacktrace
 
       - name: Publish (default branch only)
-        if: github.repository == 'square/moshi' && github.ref == 'refs/heads/master' && matrix.java-version == '8'
+        if: github.repository == 'square/moshi' && github.ref == 'refs/heads/master' && matrix.java-version == '16'
         run: ./gradlew uploadArchives
         env:
           ORG_GRADLE_PROJECT_SONATYPE_NEXUS_USERNAME: ${{ secrets.SONATYPE_NEXUS_USERNAME }}