IllegalAccessError (Appトレイトを使ってないバージョン)

A.java

package test;

public class A {
	protected int i; // ← コンストラクタ起動時にこいつにアクセスすると IllegalAccessError
	public A(int i) {
		this.i = i;
	}
}

Sample.scala

import test._

object Sample {
  def main(args: Array[String]) {
    new B(1) {
      new B(i) // 問題なし
    }

    new B(1) {
      new B(i){} // 問題なし
    }

    new A(1) {
      new A(i) // 問題なし
    }

    new A(1) {
      new A(i){} // throw IllegalAccessError
    }
  }
}

package test {
  class B(protected[test] var i: Int)
}

SampleJ.java

import test.*;

class SampleJ {
	public static void main(String[] args) {
		new A(1) {
			/* initializer */ {
				new A(i) { // 問題なし
				};
			}
		};
	}
}

コンソール

> mkdir test
> copy A.java test\A.java
> javac SampleJ.java
> java SampleJ
> scalac Sample.scala
> scala Sample
java.lang.IllegalAccessError: tried to access field test.A.i from class Sample$$
anon$5$$anon$6
        at Sample$$anon$5$$anon$6.<init>(Sample.scala:18)
        at Sample$$anon$5.<init>(Sample.scala:18)
        at Sample$.main(Sample.scala:17)
        at Sample.main(Sample.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at scala.tools.nsc.util.ScalaClassLoader$$anonfun$run$1.apply(ScalaClass
Loader.scala:78)
        at scala.tools.nsc.util.ScalaClassLoader$class.asContext(ScalaClassLoade
r.scala:24)
        at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.asContext(ScalaC
lassLoader.scala:88)
        at scala.tools.nsc.util.ScalaClassLoader$class.run(ScalaClassLoader.scal
a:78)
        at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLo
ader.scala:101)
        at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:33)
        at scala.tools.nsc.ObjectRunner$.runAndCatch(ObjectRunner.scala:40)
        at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala
:56)
        at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:80)

        at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
        at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)