#8526 Incorrect error with generics inheritance

I came across this in some legacy code. I have a feeling something like this has come up before, but it appears very simple:

This is because JTable declares and implements the method as returning a genericized Class:

 getColumnClass(int columnIndex);]]>

The error goes away if Table.getColumnClass(..) is changed to return the genericized Class:

 getColumnClass(int columnIndex);
}

class Bar extends JTable implements Table {     <--- No Error 
}]]>

The code will compile and run correctly either way, so this should be a warning rather than an error.