ssm報：HTTP Status 500 - Request processing failed; nested exception is java.lang.NullPointerException
SSM項目報：HTTP Status 500 - Request processing failed; nested exception is java.lang.NullPointerException 錯誤！ 這個錯誤可能是因爲你在Controller中接收頁面傳過去的id接收失敗，而且{itemId}下面會有一個黃色的波浪線 解決這個錯誤只需要在方法的參數前面加上@PathVariable，
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