问Java jdbc超时

EN

public class Database {

public static Database instance;

private Connection connection;

private Database() {
    try {
        Class.forName("com.mysql.jdbc.Driver");
        Log.debug("ok");
        this.connection = DriverManager.getConnection("jdbc:mysql://just.not.for.you:3006/database?connectTimeout=5000", "database", "secret");
        Log.debug("ok");
    } catch (ClassNotFoundException e) {
        Log.warn("Cloud not find jdbc driver class");
    } catch (SQLException e) {
        Log.warn("Cloud not connect to database: " + e.getMessage(), e);
    }
}


public static synchronized Database getInstance() {
    if(Database.instance == null) {
        Database.instance = new Database();
    }
    return Database.instance;
}