Java Collection compare generic class that extends interface that extends comparable

I have this interface

public interface IDataPoint<T> extends Comparable<T>  {
     public T getValue();
 }
 

and this implementation...

public class IntegerDataPoint implements IDataPoint<Integer> {
 
     // ... some code omitted for this example
 
     public int compareTo(Integer another) {
          // ... some code
     }
 }
 

and another class...

public class HeatMap<X extends IDataPoint<?> {
     private List<X> xPoints;
 }
 

Now I would like to use Collections.max (and similar) on the xPoints list, but that does not work, probably because I got my generics all messed up.

Any suggestions how this could be solved (without a Comparator)?

Collections.max(xPoints);
 

gives me this error:

Bound mismatch: The generic method max(Collection<? extends T>) of type Collections is not applicable for the arguments (List<X>). The inferred type X is not a valid substitute for the bounded parameter <T extends Object & Comparable<? super T>>
 

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