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  • IOException2022-09-11 18:00:25

    IOException   /* * Copyright (c) 1994, 2006, Oracle and/or its affiliates. All rights reserved. * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. * */ package java.io; /** * Signals that an I/O exception of some sort has occurred

  • IDEA报错之 元素类型为 "choose" 的内容必须匹配 "(when*,otherwise?)"。2022-08-16 15:01:22

    IDEA报出的错误提示如下: Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error creating document instance. Cause: org.xml.sax.SAXParseException; lineNumber: 91; column

  • ssm异常Error creating bean with name 'userMapper'2022-07-06 08:35:38

    Error creating bean with name 'userMapper' defined in file [C:\Users\86156\IdeaProjects\crm-project\crm\target\crm\WEB-INF\classes\com\enhaonode\crm\settings\mapper\UserMapper.class]: Invocation of init method failed; nested excep

  • 脚踏实地的Netty源码研究笔记——开篇2022-05-20 17:32:53

    1. 脚踏实地的Netty源码研究笔记(1)——开篇 1.1. Netty介绍 Netty是一个老牌的高性能网络框架。在众多开源框架中都有它的身影,比如:grpc、dubbo、seata等。 里面有着非常多值得学的东西: I/O模型 内存管理 各种网络协议的实现:http、redis、websocket等等 各种各样有趣的技巧

  • 注册——业务层2022-03-07 21:02:05

    4.注册——业务层 4.1 根据业务层不同,来具体查看异常种类,统一用ServiceExcption来继承 package com.cy.store.service.ex;​public class ServiceExcepiton extends RuntimeException{    public ServiceExcepiton() {        super();   }​    public ServiceExcepito

  • 报错:querying database. Cause: java.sql.SQLException: Access denied for user ‘root‘@‘localhost‘ (usin2022-02-21 23:04:58

    Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:  ### Error querying database.  Cause: java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES) ### The error may exis

  • mybatis Cause: java.sql.SQLException: sql injection violation, syntax error: 错误2022-01-12 11:32:58

    mybatis Cause: java.sql.SQLException: sql injection violation, syntax error: 错误 ### Error querying database. Cause: java.sql.SQLException: sql injection violation, syntax error: [C@19dae201 is not a number! pos 138, line 6, column 19, token LITERAL_FL

  • Mybatis|opening session的空指针异常2022-01-10 12:33:51

    控制台错误代码 `org.apache.ibatis.exceptions.PersistenceException: Error opening session. Cause: java.lang.NullPointerException Cause: java.lang.NullPointerException` 原因 核心配置文件的<environments default="development">和<environment id="dat

  • Vertx之Exception异常统一处理拦截2022-01-06 16:03:12

    介绍 Vertx统一异常拦截处理 1. maven项目依赖 <dependency> <groupId>io.vertx</groupId> <artifactId>vertx-web</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>

  • spring boot 统一接口异常返回值2021-10-26 12:00:38

    创建业务 Exception 一般在实际项目中,推荐创建自己的 Exception 类型,这样在后期会更容易处理,也比较方便统一,否则,可能每个人都抛出自己喜欢的异常类型,而造成代码混乱 ServiceException 用于抛出业务逻辑校验异常 UnauthorizedException 用于抛出用户未登录异常 可根据自己的项目需

  • mybatis的mapper.xml文件中使用中文注释时,报异常Cause: com.sun.org.apache.xerces.internal.impl.io.MalformedByteSeque2021-10-12 18:02:58

    可能的原因: 1、将mapper.xml的文件头的部分UTF-8修改为UTF8 <?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"><

  • 关于SpringMyBatis常见错误2021-09-26 14:34:46

    1.org.apache.ibatis.exceptions.PersistenceException:  ### Error building SqlSession. ### The error may exist in mybatis\mappers\demoUserMapper.xml ### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.

  • mybatis问题BUG集2021-09-26 10:02:09

     报错说明1:org.apache.ibatis.binding.BindingException: Type interface com.jt.mapper.UserMapper is not known to the MapperRegistry. 解决方案1: 检查namespace命名是否与接口一致 报错说明2: org.apache.ibatis.binding.BindingException: Invalid bound statement (n

  • Mybatis常见异常2021-09-26 09:04:10

    报错说明1:        org.apache.ibatis.binding.BindingException: Type interface com.jt.mapper.DemoUserMapper is not known to the MapperRegistry. 解决方案:检查.xml映射文件中namespace的值,是否与mapper层中的接口一致    报错说明2:         org.apache.iba

  • 2021-09-052021-09-05 14:32:41

    org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.type.TypeException: Could not set parameters for mapping: ParameterMapping{property=‘keyword’, mode=IN, javaType=class java.lang.String, jdbcType=null, numericScale=null,

  • Error parsing SQL Mapper Configuration. Cause: java.io.IOException: Could not find resource com/dy/d2021-08-17 10:02:25

    报错信息: ### Error building SqlSession. ### The error may exist in com/dy/dao/mapping/userDao-mapping.xml ### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.io.IOException: Could not find resource com/

  • 自定义异常类ServiceException2021-08-04 23:04:31

    自定义异常类一般是为了配合自定义日志用的,对程序员关注的异常信息能更有针对性,自定义异常一般都会继承 RuntimeException类.并实现其中的方法,同时将自定义异常信息向上传递给父类直至顶级父类Throwable package app.base; import org.apache.log4j.Logger; /** * *

  • Cause: java.sql.SQLFeatureNotSupportedException: getObject with type2021-07-30 17:01:55

    记录一次datetime转LocalDateTime报错。 org.springframework.dao.InvalidDataAccessApiUsageException: Error attempting to get column 'birthday' from result set. Cause: java.sql.SQLFeatureNotSupportedException: getObject with type ; getObject with type; nes

  • 使用mybatis书写xml映射文件,sql大小写的问题。2021-07-23 01:32:38

    我遇到的问题:找不到表,为啥,因为我把xml映射文件为了视觉效果更好,全部变成小写了。而在远程的mysql的表名称为大写字母,是以出现这个问题。 可能出现的错误: 问题1:Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'S.ID' in 'field list' 问题2:Cau

  • 运行Mybatis 源码报错2021-07-20 15:35:04

    运行mybatis报错原因 pinoc 在尝试读源码的时候,从Mybatis中把代码下载下来,但是出现了如下错误: Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: com.mysql.jdbc.Driver 这是驱动包加载

  • 访问MySql出现Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:错误2021-06-18 15:34:14

    1.错误现象 Error querying database.  Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:     2.解决办法 MySQL没有启动成功  

  • JVM相关 - 深入理解 System.gc()2021-06-10 15:03:22

    本文基于 Java 17-ea,但是相关设计在 Java 11 之后是大致一样的 我们经常在面试中询问 System.gc() 究竟会不会 立刻 触发 Full GC ,网上也有很多人给出了答案,但是这些答案都有些过时了。本文基于最新的信息 Java 的下一个即将发布的 LTS 版本 Java 17(ea)的源代码,深入解析 Syst

  • 自定义异常2021-06-01 11:32:22

    1.自定义异常 public class CreateFailedException extends RuntimeException{ public CreateFailedException(String errMsg) { super(errMsg); } /** * Construct a new runtime exception with the cause * * @param cause cause */

  • 关于mysql驱动版本报错解决,Cause: com.mysql.jdbc.exceptions.jdbc4、Unknown system variable ‘query_cache_size2021-05-08 21:04:21

    Error01 针对Maven项目依赖 mysql驱动版本不配置 querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up. ERR02 mysql驱动版本不配

  • java.lang.NullPointerException] with root cause2021-04-09 18:34:38

    报错大致内容 java.lang.NullPointerException] with root cause 写在前面 说明:这只是我发现的其中一个原因,可能你的和我有所不同。如果没有解决问题,轻喷。。 项目简介 SSM项目,用eclipse开发。 背景说明 商城后台添加商品。填写完商品的相关信息后,提交表单,报错。 原因 填写

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