获取java.lang.IllegalArgumentException：无效的URL：无效的URL或找不到资源

Question

我收到IllegalArgumentException错误：尝试显示骰子图像时出现无效的URL错误。错误发生在playRound方法中，该行由注释标记。当用户点击掷骰子按钮时，会出现此错误，掷骰子按钮将显示用户掷骰子。我的图像位于项目的“我的图像”文件夹中。任何帮助将不胜感激，谢谢。

Netbeans项目结构

我已经打印出文件是否存在，以查看我的网址是否正确。它表明该路径存在，但是我仍然收到无效的URL错误。

        private static void playRound() {
    playerIndex = 0;
    maxScore = 0;
    hitButton.setDisable(false);
    standButton.setDisable(false);
    blackJackRoundPlayer = blackJackRound.get(playerIndex);
    playerName.setText("Player Name: " + blackJackRoundPlayer.getPlayer().getPlayer());
    currentBalance.setText("Player Holdings: " + Integer.toString(blackJackRoundPlayer.getPlayer().getCurrentHoldings()));
    betAmountLbl.setText("Wager Amount: " + blackJackRoundPlayer.getRoundWager());
    currentBalance.setText("Current Holdings: " + blackJackRoundPlayer.getPlayer().getCurrentHoldings());

    hitButton.setOnAction(e -> {
        roll1 = rollDice();
        roll2 = rollDice();
        //validate file exists
        System.out.println("Dice Roll 1: " + new File(".\\src\\blackjack\\Images\\dice-six-faces-" + roll1 + ".png").exists());
        System.out.println("Dice Roll 2: " + new File(".\\src\\blackjack\\Images\\dice-six-faces-" + roll2 + ".png").exists());
        System.out.println("dice-six-faces-" + roll1 + ".png");
        dice1View.setImage(new Image(".\\src\\blackjack\\Images\\dice-six-faces-dice-six-faces-" + roll1 + ".png"));/*error occurs on this line*/
        dice2View.setImage(new Image(".\\src\\blackjack\\Images\\dice-six-faces-dice-six-faces-" + roll2 + ".png"));

        blackJackRoundPlayer.addToRoundScore(roll1 + roll2);

        roundScore.setText("Round Score: " + blackJackRoundPlayer.getRoundScore());
        //player score is 21 or break
        if (blackJackRoundPlayer.getRoundScore() >= 21 && playerIndex <= blackJackRound.size()) {
            playerIndex++;
            if (playerIndex <= players.size() - 1) {
                if (blackJackRoundPlayer.getRoundScore() > maxScore) {
                    maxScore = blackJackRoundPlayer.getRoundScore();
                }

                blackJackRoundPlayer = blackJackRound.get(playerIndex);
                playerName.setText("Player Name: " + blackJackRoundPlayer.getPlayer().getPlayer());
                currentBalance.setText("Player Holdings: " + Integer.toString(blackJackRoundPlayer.getPlayer().getCurrentHoldings()));
                betAmountLbl.setText("Wager Amount: " + blackJackRoundPlayer.getRoundWager());
                currentBalance.setText("Current Holdings: " + blackJackRoundPlayer.getPlayer().getCurrentHoldings());
                roundScore.setText("Round Score: " + blackJackRoundPlayer.getRoundScore());
            } else {
                hitButton.setDisable(true);
                standButton.setDisable(true);
                determineWinner(maxScore);
            }

        }
    });

    standButton.setOnAction(e -> {

        playerIndex++;
        if (blackJackRoundPlayer.getRoundScore() > maxScore) {
            maxScore = blackJackRoundPlayer.getRoundScore();
        }

        if (playerIndex <= players.size() - 1) {
            blackJackRoundPlayer = blackJackRound.get(playerIndex);
            playerName.setText("Player Name: " + blackJackRoundPlayer.getPlayer().getPlayer());
            currentBalance.setText("Player Holdings: " + Integer.toString(blackJackRoundPlayer.getPlayer().getCurrentHoldings()));
            betAmountLbl.setText("Wager Amount: " + blackJackRoundPlayer.getRoundWager());
            currentBalance.setText("Current Holdings: " + blackJackRoundPlayer.getPlayer().getCurrentHoldings());
            roundScore.setText("Round Score: " + blackJackRoundPlayer.getRoundScore());
            //determine winner
        } else {
            hitButton.setDisable(true);
            standButton.setDisable(true);
            determineWinner(maxScore);
        }

    });
}




 Dice Roll 1: true 
 Dice Roll 2: true
 dice-six-faces-4.png
 Exception in thread "JavaFX Application Thread" 
 java.lang.IllegalArgumentException: Invalid URL: Invalid URL or