I am able to draw a generalization link from class to interface.
But generated code contains 'class extends interface' string and it is not
compilable.
See also issue 79835 and issue 80551.

Steps to reproduce:

- Create a Java-Model UML project
- Create a Class diagram
- Put a Class element on the diagram and name it 'MyClass'
- Put an Interface element on the diagram and name it 'Myinterface'
- Generate code for the UML project
  'MyClass.java' and 'MyInterface.java' files are generated

- Draw a Generalization link from class to interface
- Generate code for the UML project
  The generated code is:
  -------------------------------------------------------------------
  public class MyClass extends MyInterface {
    public MyClass() {
    }
  }
  ---------------------------------------------------------------------

  The code is not compiled:
  ---------------------------------------------------------------------
  UMLProject1Sources\src\MyClass.java:3: no interface expected here
  public class MyClass extends MyInterface {
  1 error
  BUILD FAILED (total time: 3 seconds)
  ---------------------------------------------------------------------