Springboot1.5.8.RELEASE 升级到 Springboot2.2.1.RELEASE 问题纪要

• 包名变更

  import org.springframework.boot.web.support.SpringBootServletInitializer;
  变更为
  import org.springframework.boot.web.`servlet`.support.SpringBootServletInitializer;
  
  
  import org.springframework.boot.ApplicationHome;
  变更为
  import org.springframework.boot.`system`.ApplicationHome;
  
  

• jar包被移除

  spring-boot-starter-logging中的 log4j-over-slf4j被移除

  导致引用失败

  import org.apache.log4j.Logger;  
  
  private Logger logger = Logger.getLogger(getClass());  
  

  解决：

  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  private Logger logger = LoggerFactory.getLogger(this.getClass());
  

• druid-spring-boot-starter 版本过低。

  解决：由2.1.4升级到最新版本2.1.21

  NoClassDefFoundError: org/springframework/boot/autoconfigure/jdbc/metadata/DataSourcePoolMetadataProvider
  

• 循环依赖

  Caused by: org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'sysUserService': Bean with name 'sysUserService' has been injected into other beans [sysRoleService] in its raw version as part of a circular reference, but has eventually been wrapped. This means that said other beans do not use the final version of the bean. This is often the result of over-eager type matching - consider using 'getBeanNamesOfType' with the 'allowEagerInit' flag turned off, for example.
  

  解决：1、避免循环依赖 2、使用@Lazy延迟加载bean

• flyway配置添加了前缀spring.

  flyway.enabled=true 变更为 spring.flyway.enabled=true