GWT compiler complains but the JDK does not ...

During dev mode (gwt 2.5.1), gwt complaints in the gwt dev mode console about a compiler error, mainly:

This error I don't see in Eclipse, using java 1.6.35.

        00:00:55,152 [ERROR] Line 45: Bound mismatch: The generic method createSimpleCheckTracker(FormField<SelectedBooleans>, W, H, N, Form, P, AsyncConfirmer) of type FormFieldMutationFacade is not applicable for the arguments (FormField<SelectedBooleans>, W, H, N, Form, null, null). The inferred type HasSize is not a valid substitute for the bounded parameter <P extends HasSize & HasIndexOf<IsWidget> & HasRemoveAllStart>     

Line 45 is the forward of the first method below to the second method. The error concerns the fore last argument which is null (the P generics)...

Any idea why their is a difference in compiler output ?

The code:

public <W extends HasWidgetRead, P extends HasSize & HasIndexOf<IsWidget> & HasRemoveAllStart, H extends HasFlexWidget<W>, N extends HasNextBoolean> ValueChangeFormFieldTracker<SelectedBooleans> createSimpleCheckTracker(final FormField<SelectedBooleans> formField, final W widget, final H hasWidget, final N nextProcessor, final Form form) {
return createSimpleCheckTracker(formField, widget, hasWidget, nextProcessor, form, null, null);
}

 

public <W extends HasWidgetRead, P extends HasSize & HasIndexOf<IsWidget> & HasRemoveAllStart, H extends HasFlexWidget<W>, N extends HasNextBoolean> ValueChangeFormFieldTracker<SelectedBooleans> createSimpleCheckTracker(final FormField<SelectedBooleans> formField, final W widget, final H hasWidget, final N nextProcessor, final Form form, final P container, final AsyncConfirmer confirmPerformer) {

    ....
    return ..... 

}

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