D8 cannot handle classes compiled for Java 11 which access private members across a class boundary because of the new nestmates: http://openjdk.java.net/jeps/181.

Ideally D8 would desugar these nestmates. A simple strategy would be falling back to pre-Java 11 behavior of generating a synthetic accessor method (which R8 could then remove, if enabled) for each access across the nest.

Repro:

$ java -version
openjdk version "11" 2018-09-25
OpenJDK Runtime Environment 18.9 (build 11+28)
OpenJDK 64-Bit Server VM 18.9 (build 11+28, mixed mode)

$ java -jar ~/dev/android/r8/build/libs/d8.jar --version
D8 1.3.22-dev
build engineering

$ cat Java11.java
import java.util.function.*;

class Java11 {
private final String name;

Java11(String name) {
this.name = name;
}

private final class Inner implements Runnable {
@Override public void run() {
System.out.println(name); // <-- private member across class boundary
}
}

public static void main(String... args) {
new Java11("Test").new Inner().run();
}
}

$ javac Java11.java

$ java -jar /Users/jakew/dev/android/r8/build/libs/d8.jar --lib $ANDROID_HOME/platforms/android-28/android.jar --release --output . *.class
Compilation failed with an internal error.
java.lang.UnsupportedOperationException
at com.android.tools.r8.org.objectweb.asm.ClassVisitor.visitNestHostExperimental(ClassVisitor.java:158)
at com.android.tools.r8.org.objectweb.asm.ClassReader.accept(ClassReader.java:541)
at com.android.tools.r8.org.objectweb.asm.ClassReader.accept(ClassReader.java:391)
at com.android.tools.r8.graph.JarClassFileReader.read(JarClassFileReader.java:96)
at com.android.tools.r8.dex.ApplicationReader$ClassReader.lambda$readClassSources$1(ApplicationReader.java:231)
at java.base/java.util.concurrent.ForkJoinTask$AdaptedCallable.exec(ForkJoinTask.java:1448)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

Issue 116628246

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