Too few arguments MS Access exception

Question

Hello together!
I am getting frustrated with that problem.
I have a MS Access database and try to execute the following statement:
SELECT * FROM RegisteredUser WHERE UName = "+userName+ " AND UPassword = "+password
userName and password are Strings.
The table and the columns are spelled exactly the same, i already checked this, but I gut the error: Too few arguments.
Are there any other possible error reasons?
When I copy my statement and execute it in MS Access then it works.
Thanks a lot.

Answer 1

Thanks for your help.
Of course I will only store a hash value in the end version.
I just need it for test reason now without a hash.
Here is my code:
public static boolean isUser(String userName, String password) throws SQLException
          Statement statement = DataBase.getConnection().createStatement();
     ResultSet resultSet = statement.executeQuery(
          "SELECT * FROM RegisteredUser WHERE UName = "+userName+ " AND UPassword = "+password+"");
     if (resultSet.next()) {
          resultSet.close();
               statement.close();
          return true;
          } // if
     resultSet.close();
          statement.close();
          return false;
     }