Confused by error overriding generics

Question

Hi,
I am taking my first tentative steps with generics, but don't really understand what is happening.
I have overridden AbstractList<String> with the simplest sub-class I could (see below).
It compiles, but when I run it, I get an error:
"java.lang.ClassFormatError: Repetitive method name/signature in class file StringList"
If I run with the -noverify flag on the VM, it runs fine.
Does anyone know why this happens? Where is the repetitiion?
Thanks
Roger
import java.util.AbstractList;
import java.util.Vector;
public class StringList extends AbstractList<String>
     private final Vector<String> _list;
     public StringList(String[] arr)
          super();
          _list = new Vector<String>();
          for (String s: arr)
               _list.add(s);
     public String get(int index)
          return _list.get(index);
     public int size()
          return _list.size();
     public static void main(String[] args)
          StringList s = new StringList(args);
          for (String text: s._list)
               System.out.print(text+" ");
}

Answer 1

Runs fine for me. Are you using Tiger beta 1 or 2. If using beta 1, try specifying -source 1.5 -target 1.5 javac options.
I would also suggest:
import java.util.AbstractList;
import java.util.Vector;
public class StringList<T extends String> extends AbstractList<T> {
   private final Vector<T> list;
   public StringList(T... arr) {
      super();
      list = new Vector<T>();
      for (T s: arr)
         list.add(s);
   public T get(int index) {
      return list.get(index);
   public int size() {
      return list.size();
   public static void main(String[] args) {
      StringList<String> s = new StringList<String>("one", "two", "three");
      for (String text: s)
         System.out.println(text + " ");
}