@Test(expected = WrongReferenceAttributeValueException.class)
public void testCheckNullValue() throws Exception {

	System.out.println("testCheckNullValue()");
	List<String> list = new ArrayList<>();
	list.add("not name");
	reqAttribute.setValue(list);
	attributeToCheck.setValue(null);
	classInstance.checkAttributeSemantics(session, user, attributeToCheck);
}