Call a function with one IN/OUT parameter and returning a VARCHAR type value in Java

import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Types;
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public class Main {
  public static void main(String[] args) throws Exception {
    Connection connection = getConnection();
    CallableStatement cs = connection.prepareCall("{? = call myfuncinout(?)}");
    
    // Register the types of the return value and OUT parameter
    cs.registerOutParameter(1, Types.VARCHAR);
    cs.registerOutParameter(2, Types.VARCHAR);

    // Set the value for the IN/OUT parameter
    cs.setString(2, "a string");

    // Execute and retrieve the returned values
    cs.execute();
    String retValue = cs.getString(1);           // return value
    String outParam = cs.getString(2);           // IN/OUT parameter

  }

  private static Connection getConnection() throws Exception {
    Class.forName("org.hsqldb.jdbcDriver");
    String url = "jdbc:hsqldb:mem:data/tutorial";

    return DriverManager.getConnection(url, "sa", "");
  }
}