空指针Excpetion Java Minecraft MySQL

我正在开发一个Minecraft/TeamSpeak验证系统。 但当我想连接到我的数据库时

java.lang.NullPointerException

. 这是密码

public class MySQL {

    public String host = "localhost";
    public String database = "tsverify";
    public String username = "silentgames";
    public String password = "Epic_Password";
    public Connection con;

    public void connect() {
        if (!isConnected()) {
            try
            {
                con = DriverManager.getConnection("jdbc:mysql://" + host + ":3306/" + database + "?autoReconnect=true", username, password);
                System.out.println("[MySQL] [Sync] Verbindung aufgebaut!");
            }
            catch (SQLException e)
            {
                System.out.println("[MySQL] Connection failed");
                e.printStackTrace();
            }
        }
    }
}

我还在onEnable()方法中添加了mysql.connect()方法,所以它实际上是连接到数据库的。