code: public void setInvalidUserList(java.util.Collection<String> invalidUserList) {
          if (invalidUserList == null) {
              this.invalidUserList = null;
              return;
          }
  
          this.invalidUserList = new com.amazonaws.internal.SdkInternalList<String>(invalidUserList);
      }
docs: <p>
  A list of users or groups in the Active Directory that are not allowed to access the file share. A group must be
  prefixed with the @ character. For example <code>@group1</code>. Can only be set if Authentication is set to
  <code>ActiveDirectory</code>.
  </p>
  
  @param invalidUserList
  A list of users or groups in the Active Directory that are not allowed to access the file share. A group
  must be prefixed with the @ character. For example <code>@group1</code>. Can only be set if Authentication
  is set to <code>ActiveDirectory</code>.