Compile error on inheritance of generic inner class extending with bounds
- by Arne Burmeister
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.
