Determine / find the database owner ("dbo") and current user in an embedded Derby (JavaDB) database

GetDerbyDBO.java

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;

/**
  * Example class, showing how to find owner of an embedded Derby database.
  *
  * <p>Creates a simple embedded Derby database with a user-specified
  * {@code databaseName}, and creates a user with the given {@code username}
  * and {@code password}.</p>
  *
  **/
public class GetDerbyDBO {

  // The `bootPassword` is the password required to start the embedded
  // database server. It should be entered each time the database is to be
  // started, and not hardcoded like it is here.

  private static final String bootPassword = "correcthorsebatterystaple";

  private static void usage() {
    System.out.println("usage: GetDerbyDBO <databaseName> <username> <password>");
  }

  public static void main (String[] args) {
    if (args.length != 3) {
      usage();
      System.exit(-1);
    } connectToDB(args);
  }

  public static boolean connectToDB (String[] args) {
    String url =
      "jdbc:derby:" + args[0] +        // embedded database name
      ";user=" + args[1] +             // username
      ";password=" + args[2] +         // password
      ";bootPassword=" + bootPassword; // password to boot database server

    Connection connection = null;
    Statement statement = null;

    try { // try to connect to the database
      connection = DriverManager.getConnection(url);
      System.out.println("connectToDB() : connected to database");

    // if there's an exception, the database can't be found
    } catch (SQLException ex) {
      url += ";create=true;dataEncryption=true";

      try { // try to create the database
        connection = DriverManager.getConnection(url);
        System.out.println("connectToDB() : created database");

      } catch (SQLException e2) {
        printSQLException(e2);
        return false;
      }
    }

    ResultSet resultSet = null;
    ResultSetMetaData rsmd = null;
    int columnsNumber = -1;

    try {
      statement = connection.createStatement();

      // Derby DB configuration can be found in "system tables":
      // https://db.apache.org/derby/docs/10.9/ref/rrefsistabs38369.html

      // get the name of the database owner
      resultSet = statement.executeQuery("select authorizationid from sys.sysschemas where schemaname='SYS'");
      rsmd = resultSet.getMetaData();
      resultSet.next();
      System.out.println("database owner is: " + resultSet.getString(1));

      // get the name of the current user
      resultSet = statement.executeQuery("values current_user");
      rsmd = resultSet.getMetaData();
      resultSet.next();
      System.out.println("current user is: " + resultSet.getString(1));

    } catch (SQLException ex) {
      printSQLException(ex);
      return false;
    }

    return true;
  }

  // from: http://bit.ly/2zJV23d
  public static void printSQLException(SQLException e) {
    while (e != null) {
      System.err.println("\n----- SQLException -----");
      System.err.println("  SQL State:  " + e.getSQLState());
      System.err.println("  Error Code: " + e.getErrorCode());
      System.err.println("  Message:    " + e.getMessage());
      e = e.getNextException();
    }
  }

}

/* EXAMPLE USAGE:

$ java GetDerbyDBO myExampleDB dbo dbopassword
connectToDB() : created database
database owner is: DBO
current user is: DBO

$ java GetDerbyDBO myExampleDB otherUser anotherPwd
connectToDB() : connected to database
database owner is: DBO
current user is: OTHERUSER

*/