I have a problem when compiling a generic class with an inner class. The class extends a generic class, the inner class also.

Here the interface implemented:

public interface IndexIterator<Element>
    extends Iterator<Element>
{
  ...
}

The generic super class:

public abstract class CompoundCollection<Element, Part extends Collection<Element>>
    implements Collection<Element>
{
  ...

  protected class CompoundIterator<Iter extends Iterator<Element>>
      extends ImmutableIterator<Element>
  {
    ...
  }
}

The generic subclass with the compiler error:

public class CompoundList<Element>
    extends CompoundCollection<Element, List<Element>>
    implements List<Element>
{
  ...

  private class CompoundIndexIterator
      extends CompoundIterator<IndexIterator<Element>>
      implements IndexIterator<Element>
  {
    ...
  }
}

The error is:

type parameter diergo.collect.IndexIterator<Element> is not within its bound
       extends CompoundIterator<IndexIterator<Element>>
                                             ^

What is wrong? The code compiles with eclipse, but bot with java 5 compiler (I use ant with java 5 on a mac and eclipse 3.5). No, I cannot convert it to a static inner class.