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1)在pom文件中添加依赖:
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<!--该配置必须-->
<fork>true</fork>
</configuration>
</plugin>
</plugins>
</build>
2)左上角依次找到【File】——【Settings...】——【Build,Execution,Deployment】——【Compiler】,
勾选"Build project automatically",然后右下角【Apply】——【OK】:
3)点击idea右上角搜索图标,搜索"Registry",选择搜索出来的最后一个:
4)找到"compiler.automake.allow.when.app.running",勾选,
点击【Close】关闭:
5)重启idea