前言

简单记录一次本人在自己的SpringBoot项目project-template中，把1.5.3版本升级到2.1.8版本时升级的步骤，及遇到的问题。

提升parent版本号

更改pom文件中parent的版本号

   <parent>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-parent</artifactId>
       <version>2.1.8.RELEASE</version>
       <relativePath />
   </parent>

修改yml文件中的部分配置

在1.5版本中，部分配置与2.1版本有些不同

应用名及上下文

1.5版本

server:
  application-display-name: ProjectTemplate-Web
  context-path: /project

2.1版本

server:
  servlet:
    application-display-name: ProjectTemplate-Web
    context-path: /project

文件上传

1.5版本

spring:
  http:
    multipart:
      location: E:/dev/Project/work/project_data/projettemplate/temp/dev  #文件临时目录
      max-request-size: 40MB
      max-file-size: 40MB

2.1版本

 spring:
   servlet:
     multipart:
       location: E:/dev/Project/work/project_data/projettemplate/temp/dev # 文件临时目录
       max-request-size: 40MB
       max-file-size: 40MB

mysql连接

1.5版本

  spring:
     datasource:  
       url: jdbc:mysql://localhost:3306/projettemplate?useUnicode=true&useSSL=false&characterEncoding=utf-8&autoReconnect=true&serverTimezone=GMT
       username: root
       password: root
       type: com.alibaba.druid.pool.DruidDataSource
       driver-class-name: com.mysql.cj.jdbc.Driver

2.1版本

  spring:
     datasource: 
       druid:
         url: jdbc:mysql://localhost:3306/projettemplate?useUnicode=true&useSSL=false&characterEncoding=utf-8&autoReconnect=true&serverTimezone=GMT
         username: root
         password: root
         db-type: com.alibaba.druid.pool.DruidDataSource
         driver-class-name: com.mysql.cj.jdbc.Driver

redis配置

1.5版本

 spring:
  redis:   # REDIS (RedisProperties)
    database: 0
    host: 127.0.0.1
    port: 6379
    timeout: 2000
    pool:
      max-active: 8
      max-wait: -1
      max-idle: 8
      min-idle: 0

2.1版本

 spring:
   redis:   # REDIS (RedisProperties)
     database: 0
     host: 127.0.0.1
     port: 6379
     timeout: 2000
     jedis:
       pool:
         max-idle: 8
         max-wait: -1

启动项目遇到的问题

druid-spring-boot-starter版本过低报异常

当版本为1.1.6时，报异常：

... ...
Caused by: java.lang.IllegalStateException: Failed to introspect Class [com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure] from ClassLoader [sun.misc.Launcher$AppClassLoader@18b4aac2]
... ...
Caused by: java.lang.NoClassDefFoundError: org/springframework/boot/autoconfigure/jdbc/metadata/DataSourcePoolMetadataProvider
... ... 
java.lang.IllegalStateException: Failed to introspect Class [com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure] from ClassLoader [sun.misc.Launcher$AppClassLoader@18b4aac2]
... ... 
Caused by: java.lang.NoClassDefFoundError: org/springframework/boot/autoconfigure/jdbc/metadata/DataSourcePoolMetadataProvider
... ... 
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.autoconfigure.jdbc.metadata.DataSourcePoolMetadataProvider

升级为1.1.10版本即可

 <dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>druid-spring-boot-starter</artifactId>
     <version>1.1.10</version>
 </dependency>

SpringSecurity的AuthenticationManager启动报异常

当报异常：

A component required a bean of type 'org.springframework.security.authentication.AuthenticationManager' that could not be found

在SpringSecurity文件中重写

    @Bean(name = BeanIds.AUTHENTICATION_MANAGER)
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }

其他

当报以下异常：

The bean 'userDetailsServiceImpl', defined in class path resource [com/itmacy/dev/auth/security/SecurityConfig.class], could not be registered. A bean with that name has already been defined in file [/Users/chenmeixuan/macy/dev/project/study/webBack/project-template/target/project-template-1.0.0-SNAPSHOT_20200215-1336/classes/com/itmacy/dev/auth/security/UserDetailsServiceImpl.class] and overriding is disabled.

在yml文件中添加以下配置即可

spring:
   main:
     allow-bean-definition-overriding: true

完结，撒花。。。