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README
Apache-2.0

HotSwapHelper 基于HotSwapAgent热更新的Intellij插件,修改代码后无需重启服务器

完美兼容国内常见的springboot+mybatis+mybatisplus等项目的热加载,完美兼容若依,ruoyi vue pro,jeecg等项目

Jetbrains Plugins 加入QQ群

使用说明

  1. https://github.com/gejun123456/HotSwapHelper/releases 根据自己的jdk版本去下载对应的jdk或者去qq群下载
  2. 下载后解压,idea配置为对应的jdk
  3. Intellij安装了HotSwapHelper插件后在idea的debug按钮旁边有个图标,使用Debug With HotSwap 即可热更新
  4. 查看日志中是否出现org.hotswap.agent.HotswapAgent字样,出现则代表加载成功了
  5. 修改代码后,需要编译一下Ctrl F9(build project),多模块的项目只用编译修改了代码的模块就行Build module.

支持框架

hotSwapAgent支持的插件都支持 包括以下

springboot,springmvc,hibernate,mybatis,mybatis-plus,log4j等等,可以参考https://github.com/HotswapProjects/HotswapAgent 目前已支持国内常见的springboot+mybatis项目

HotSwapAgent支持的操作

  1. 修改java方法,增减java方法字段等等,修改xml,增减xml等,唯一不支持的操作是修改类继承关系比如改变父类或者删除接口

Ctrl+F9速度很慢

  1. 修改一个文件可以用ctrl shift F9 修改单个module的话在Build菜单 Build Module或者文件夹上build module
  2. 不要使用Rebuild module 或者 Rebuild project 会导致去加载所有的类

建议给Build module加一个快捷键 比如ctrl alt shift F9,使用起来更方便

多模块项目 ctrl F9编译后导致很多类 reload导致程序或者热加载失败

如果你没有修改resource文件比如xml或者properties,yml等,但是target目录里的文件夹时间更新了,比如依赖的module的target文件夹里面的目录
这个问题是Intellij第二次ctrl F9去更新了target目录的resource文件导致的。 解决方法:

  1. 在maven或gradle clean后请用ctrl F9编译项目两次,然后再启动项目。
  2. 可以使用Build module编译单个module。
  3. 如果还有问题,可以查看intellij的版本是否是2023的版本,升级到2024版本。
  4. 禁用掉springboot插件
  5. 其他问题请联系我来看看

修改了xml后用ctrl shift F9报错了 File Not Found

可以使用ctrl F9或者在xml的文件夹上用ctrl Shift F9或者build module

支持的框架的版本

参考文章:https://github.com/HotswapProjects/HotswapAgent?tab=readme-ov-file#java-frameworks-plugins
mybatis最好在3.5.0以上
mybatisplus需要3.2.0以上
pageHelper正在兼容中 插件1.0.3版本已兼容
dynamic-datasource最好在3.6.1以上的版本,低于该版本看启动是否会报错
dubbo正在兼容中

mybatisplus修改xml后分页sql有问题

  1. 升级插件到最新版本1.0.4 qq群文件有

dynamic datasource加了注解后不生效

  1. 升级插件到最新版本1.0.4 qq群文件有

本地测试已通过的一些开源项目

项目名称 地址 支持的地方 更多说明
若依 https://github.com/yangzongzhuan/RuoYi 支持mybatis xml热加载 java热加载
RuoYi-Vue-Plus https://gitee.com/dromara/RuoYi-Vue-Plus 支持mybatis xml热加载 java热加载
jeecg https://github.com/jeecgboot/JeecgBoot 支持mybatis xml热加载 java热加载
mall https://gitee.com/macrozheng/mall 支持mybatis xml热加载 java热加载
ruoyi-vue-pro https://gitee.com/zhijiantianya/ruoyi-vue-pro 支持mybatis xml热加载 java热加载
ruoyi_flowable https://gitee.com/tony2y/RuoYi-flowable.git 支持mybatis xml热加载 java热加载

和其他方案对比

名称 是否收费 优点 缺点
Jrebel 是 收费很贵 兼容框架较多 兼容一些老版本的框架 测试不兼容mybatis实体类加减字段,不支持部分spring aop
HotSwapAgent 免费开源 开源可自己修改代码兼容一些框架,目前已完美兼容常见的springboot+mybatis+mybatisplus等项目 部分框架还未兼容
Spring dev tool 免费开源 依赖springboot,使用重启技术,兼容性好 使用重启技术 对于大点的项目速度较慢

常见问题

使用run修改java代码不生效

需要使用Debug with hotSwap

编译代码后没反应 日志中没有错误也没有新日志

  1. 确保intellij配置 `Build, Execution, Deployment/Debugger/HotSwap/Reload class after compilation 为Always.
  2. 使用Debug with HotSwapAgent启动

maven热加载失败 程序直接退出了

  1. 确保intellij配置 `Build, Execution, Deployment/Build tools/Maven/Runner/Delegate IDE build to maven 不要勾选

spring getBean找不到类

  1. 如果这个bean使用了接口,请使用接口来找或者用bean的名字来查找bean

升级到IDEA 2024.3版本出现NoClassFoundException或其他报错

  1. 升级下插件 如果还不行则配置设置"Build, Execution, Deployment" → "Debugger" → "Async Stack Traces" 关闭 "Instrumenting agent"选项

修改类后A fatal error has been detected by the Java Runtime Environment:

  1. 一般是jdk8的问题,可以用jdk11看看,有问题也可联系我来看看

tomcat或者jetty等项目如何热加载:

  1. 1.1.5版本的插件在设置->HotSwapHelper界面可以导出vm参数,然后在tomcat或者jetty的vm参数中加入这个参数,修改代码或xml文件需要使用 点击update按钮使用 update classes and resources选项即可热加载

tomcat多模块项目无法热加载xml等

  1. 需要resource目录添加 hotswap-agent.properties文件 里面有个选项 extraClasspath=C:/Users/Administrator/Downloads/SpringMVCForTomcat/SpringMVCForTomcat/target/classes 添加其他模块的classes路径就能热加载了

Intellij新ui 按钮看不到 怎么拖出来

1.在IDEA debug 按钮旁边空白的地方鼠标右键 有个 customize Toolbar -> Add Actions -> 搜索Hotswap 然后添加到General Actions中

java17启动报错 java.nio.channels.ReadableByteChannel sun.nio.ch.ChannelInputStream.ch accessible: module java.base does not "opens sun.nio.ch" to unnamed module @8297b3a

使用插件新版本即

java.lang.NoClassDefFoundError: org/hotswap/agent/config/PluginManager

Edit Configuration -> Shorten Command Line -> Jar manifest

为什么需要下载一个 jdk?

HotSwapHelper Releases这里提供的 jdk 包含了dcevm 和hotswap 文件夹,统一在一个位置, dcevm用来支持更好的热加载功能,比如类加减字段和方法等。 无需自己再去安装dcevm或者根据jdk版本去查对应的jdk加入agent文件等,方便用户使用。 如果您不喜欢这种方式,您可以根据文档HotSwapAgent GitHub page自行安装

适用于Mac Aarch64 M芯片的 Java 8 JDK 选择

目前dcevm没有专门为 Mac Aarch64 M 系列设计的 Java 8 JDK。
如果使用 macAdoptJdk-1.8-x64,则需要通过转译运行,速度较慢。
或者可以使用 jbr11-aarch 版本,大多数情况下可以正常运行,没有问题。

其他问题也可以查看HotSwapAgent 看看是否支持或者去提交issue https://github.com/HotswapProjects/HotswapAgent

碰到问题

可以联系我,加入qq群: 加入QQ群

或者发邮件给:gejun123456@gmail.com

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简介

基于HotSwapAgent的Intellij插件,java项目热加载,支持国内常见的springboot mybatis mybatisplus hibernate的热加载,开源免费,jrebel的免费替代,目前已支持若依jeecg等项目的热加载 展开 收起
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