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java.lang.NullPointerException] with root cause

本文轉載自查看原文 2021-04-09 18:26 487

報錯大致內容

java.lang.NullPointerException] with root cause

寫在前面

說明：這只是我發現的其中一個原因，可能你的和我有所不同。如果沒有解決問題，輕噴。。

項目簡介

SSM項目，用eclipse開發。

背景說明

商城后台添加商品。填寫完商品的相關信息后，提交表單，報錯。

原因

填寫的時候，所輸入的值要和POJO實體類的屬性的類型一致，否則就報錯

例子

前台頁面及部分代碼

在這里插入圖片描述

后台POJO類

在這里插入圖片描述

由於POJO類中price的類型是Double，那商品價格一欄就不要輸入字符串（自己最開始測試時隨便輸入了一些字母，報錯了，改輸為數字即可。）

參考

java.lang.NullPointerException] with root cause

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猜您在找 Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause ------>Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause java.lang.NullPointerException Servlet.service() for servlet [gCmsFront] in context with path [/cms] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause java.lang.NullPoi Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause java.lang.Nul Servlet.service() for servlet [dispatcherServlet] in context with path [/heima_ssm_web] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause java.lang.NullPointerException: null 報錯：嚴重: Servlet.service() for servlet [springmvc] in context with path [ ] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause 關於Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause錯誤提示 spring mybatis 整合問題Error parsing Mapper XML. Cause: java.lang.NullPointerException

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