小编Aza*_*aan的帖子

我正在尝试将我的tic tac toe游戏结果输出到数据库.但是,只要两个客户端之间的匹配完成,我就会遇到此错误.这是我的服务器端代码的摘录和错误消息:

数据库类:

    import java.sql.*;
    import java.util.*;
    import javax.swing.JOptionPane;

    class Database {

final String JDBC_DRIVER = "org.apache.derby.jdbc.ClientDriver";
final String DB_URL = "jdbc:derby://localhost:1527/Mini Project";

//  Database credentials
final String USER = "Joe";
final String PASS = "plateau";

Connection conn; 
Statement stmt;

public Database() {

    try {
        Class.forName("org.apache.derby.jdbc.ClientDriver");

        System.out.println("Connecting to database...");
        conn = DriverManager.getConnection(DB_URL, USER, PASS);

        //STEP 4: Execute a query
        System.out.println("Creating statement...");
        stmt = (Statement) conn.createStatement();

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

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

    }

} …