Add java doc comments

+        return username;
+    }
+
+    public void setUsername(String username) {

+        return userMailAttributes;
+    }
+
+    private void populateUserAttributes(UserMailAttributes userMailAttributes, List<EnrollmentTypeMail> enrollmentTypeMails) {

+        return enrollmentTypeMail;
+    }
+
+    private List<EnrollmentTypeMail> getEnrollmentTypeMails(List<DeviceEnrollmentType> deviceEnrollmentTypes) {