Instance method reference of a null object

Question

What is the right behavior according to JLS when methodReferenceOfNullObject() is invoked?

• throw a NullPointerException (Oracle Java Compiler) or

• assign supplier to result though o is null (Eclipse Java Compiler)

  public void methodReferenceOfNullObject() {
      Object o = nullReference();
  
      Supplier<String> result = o::toString; // <-- point of interest
  
      ...
  }
  
  private Object nullReference() {
      return null;
  }