清楚无效的引用
-----------------------------
热部署
(preferences别忘记点击apply,registry找不到用全局搜索ctrl+shift+a，引入maven资源，设置plugin)
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork>
</configuration>
</plugin>
