Cannot insert data into a table in db using jdbc

I have a problem to insert a new row of data into a table I created via JDBC. It throws SQLException after the ExecuteUpdate() line.

Below I provide a code which created the DB and the Table in this DB. The second part has the code which is supposed to insert values into row in a PatientsData table.

public class DbSetUp {

private static Connection con;
private static String mySqlString = "CREATE TABLE PatientsData" +
        "(id INTEGER PRIMARY KEY," +
        "fname VARCHAR(30) NOT NULL," +
        "lname VARCHAR(30) NOT NULL," +
        "sex VARCHAR(1) NOT NULL," +
        "insurance VARCHAR(1) NOT NULL," +
        "profession VARCHAR(30) NOT NULL)";
//private boolean end;
private static String strTemp = "CREATE TABLE PatientsTemp" +
        "(id INTEGER PRIMARY KEY," +
        "name VARCHAR(256) NOT NULL," +
        "date DATE NOT NULL," + 
        "temp NUMERIC NOT NULL)";


public static void main(String[] args) {

    try {
        Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
    } catch (ClassNotFoundException e) {
        System.out.println("Driver not found");
        e.printStackTrace();
    }   

    try {
        con = DriverManager.getConnection("jdbc:derby:PatientDb;create=true");
    } catch (SQLException e) {
        System.out.println("Db not found");
        e.printStackTrace();
    }

    Statement statement = null;
    try{
        statement = con.createStatement();
        statement.execute(mySqlString);
        statement.execute(strTemp);

    } catch(SQLException ex){
        ex.printStackTrace();
    }



}

The above code works fine throwing no exceptions. I assume that both tables have been created and the DB exists:)

Not the part which is supposed to insert data:

public Patient createNewPatient(int id, String fname, String lname,
        String sex, String insurance, String profession) {

    try {
        DriverManager.registerDriver(new org.apache.derby.jdbc.EmbeddedDriver());
    } catch (SQLException e1) {
        System.out.println("to na poczatku");
        e1.printStackTrace();
    }

    try{
        con = DriverManager.getConnection("jdbc:derby:PatientDb"); 
        PreparedStatement ps = con.prepareStatement("INSERT INTO PatientsData VALUES(?,?,?,?,?,?)");
        System.out.println("Prepared Statement");
        ps.setInt(1, id);
        System.out.println("set int id");
        ps.setString(2, fname);
        ps.setString(3,lname);
        ps.setString(4,sex);
        ps.setString(5, insurance);
        ps.setString(6,profession);
        System.out.println("set string profession");
        result = ps.executeUpdate();
        System.out.println(result);
        return new Patient(id,fname,lname,sex,insurance,profession);
        //System.out.println("set string profession");


    } catch(SQLException e){
        System.out.println("SQL exception");
        return null;
    }

}

The line: result = ps.executeUpdate(); throws SQLException, I have no idea where is the mistake. I have added derby.jar into my build path.