Fix kapt on JDK 16

Author: tschuchortdev

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
     if: ${{ needs.check_duplicate_workflows.outputs.should_skip != 'true' }}
     strategy:
       matrix:
-        java: [ '8', '11', '15' ]
+        java: [ '8', '11', '16' ]
         platform: ['windows-latest', 'ubuntu-latest']
     steps:
     - uses: actions/checkout@v2
@@ -40,6 +40,17 @@ jobs:
         restore-keys: ${{ runner.os }}-gradle
     - name: print Java version
       run: java -version
+    - name: Set JVM options for JDK 16
+      if: ${{ matrix.java == 16 }}
+      run: echo org.gradle.jvmargs="--illegal-access=permit \
+        --add-opens=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED \
+        --add-opens=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED \
+        --add-opens=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED \
+        --add-opens=jdk.compiler/com.sun.tools.javac.jvm=ALL-UNNAMED \
+        --add-opens=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED \
+        --add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED \
+        --add-opens=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED \
+        --add-opens=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED" >> gradle.properties
     - name: Run build
       run: ./gradlew clean assemble --info
 
@@ -49,7 +60,7 @@ jobs:
     needs: [build]
     strategy:
       matrix:
-        java: [ '8', '11', '15' ]
+        java: [ '8', '11', '16' ]
         platform: ['windows-latest', 'ubuntu-latest']
     steps:
       - uses: actions/checkout@v2
@@ -68,6 +79,17 @@ jobs:
           restore-keys: ${{ runner.os }}-gradle
       - name: print Java version
         run: java -version
+      - name: Set JVM options for JDK 16
+        if: ${{ matrix.java == 16 }}
+        run: echo org.gradle.jvmargs="--illegal-access=permit \
+          --add-opens=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED \
+          --add-opens=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED \
+          --add-opens=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED \
+          --add-opens=jdk.compiler/com.sun.tools.javac.jvm=ALL-UNNAMED \
+          --add-opens=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED \
+          --add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED \
+          --add-opens=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED \
+          --add-opens=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED" >> gradle.properties
       - name: Run test
         run: ./gradlew check --info
 

build.gradle

@@ -155,4 +155,20 @@ subprojects {
     }
 
     sourceCompatibility = 1.8
+
+    if (JavaVersion.current() >= JavaVersion.VERSION_16) {
+        test {
+            jvmArgs = [
+                    "--illegal-access=permit",
+                    "--add-opens=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED",
+                    "--add-opens=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED",
+                    "--add-opens=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED",
+                    "--add-opens=jdk.compiler/com.sun.tools.javac.jvm=ALL-UNNAMED",
+                    "--add-opens=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED",
+                    "--add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED",
+                    "--add-opens=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED",
+                    "--add-opens=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED"
+            ]
+        }
+    }
 }