A protected inner class is inaccessible from another package. The following
example demonstrates the problem.

-----


package p1;

public class ProtectedInnerClass1 {
    protected class Foo {
public String getBar() { return "bar"; }
    }
}

-----

package p2;

public class ProtectedInnerClass2 extends p1.ProtectedInnerClass1
{
    /* ProtectedInnerClass2.java:4: Can't access inner class p1.ProtectedInnerClass1.Foo.
     * Only public classes and interfaces in other packages can be accessed.
     * protected class Bug extends Foo {
     * ^
     */

    class Bug extends Foo {
String getBug() { return getBar(); }
    }
}