随着Spring Boot 3.0需要Java 17 和Spring Framework 6作为最低版本。计划逐步升级系统的Srping Boot版本，以应对未来的趋势，当前系统Spring Boot 版本是 2.3.12，继续先升即到2.4.13，然后2.5.X,2.6.X ,2.7.X,最后3.0系列。
防止版本跳跃多大，改动点太多。
在2.3.12升级到2.4.13的过程中遇到如下几个问题，在此记录一下：

一、springboot 2.4以上版本兼容junit4和junit5

springboot2.4以上版本移除了默认的junit4引擎，需要自行引入

<!-- 集成SpringBoot测试框架 -->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-test</artifactId>
  <scope>test</scope>
</dependency>

<!-- SpringBoot兼容JUnit4兼容引擎 -->
<dependency>
  <groupId>org.junit.vintage</groupId>
  <artifactId>junit-vintage-engine</artifactId>
  <scope>test</scope>
  <exclusions>
    <exclusion>
      <groupId>org.hamcrest</groupId>
      <artifactId>hamcrest-core</artifactId>
    </exclusion>
  </exclusions>
</dependency>

二、跨域配置

使用 corsConfiguration.setAllowedOriginPatterns(Arrays.asList(CorsConfiguration.ALL)) 替换
corsConfiguration.addAllowedOrigin("*");
否则会出现如下异常：

java.lang.IllegalArgumentException: When allowCredentials is true, allowedOrigins cannot contain the special value "*" since that cannot be set on the "Access-Control-Allow-Origin" response header. To allow credentials to a set of origins, list them explicitly or consider using "allowedOriginPatterns" instead.
	at org.springframework.web.cors.CorsConfiguration.validateAllowCredentials(CorsConfiguration.java:473)
	at org.springframework.web.cors.CorsConfiguration.checkOrigin(CorsConfiguration.java:577)
	at org.springframework.web.cors.DefaultCorsProcessor.checkOrigin(DefaultCorsProcessor.java:174)
	at org.springframework.web.cors.DefaultCorsProcessor.handleInternal(DefaultCorsProcessor.java:116)

● Spring Boot 2.3 时, 使用如下配置

@Configuration
public class CorsConfig {


    private CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedHeader("*");                // 设置访问源请求头
        corsConfiguration.addAllowedMethod("GET");              // 允许GET方法访问
        corsConfiguration.addAllowedMethod("POST");             // 允许POST方法访问
        corsConfiguration.addAllowedMethod("OPTIONS");          // 允许OPTIONS方法访问
        corsConfiguration.setAllowCredentials(Boolean.TRUE);
        corsConfiguration.addAllowedOrigin("*");
        corsConfiguration.setMaxAge(3600L);
        return corsConfiguration;
    }

    @Bean
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig()); // 4 对接口配置跨域设置
        return new CorsFilter(source);
    }

}

● Spring Boot 2.4，使用如下配置

@Configuration
public class CorsConfig {


    private CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedHeader("*");                // 设置访问源请求头
        corsConfiguration.addAllowedMethod("GET");              // 允许GET方法访问
        corsConfiguration.addAllowedMethod("POST");             // 允许POST方法访问
        corsConfiguration.addAllowedMethod("OPTIONS");          // 允许OPTIONS方法访问
        corsConfiguration.setAllowCredentials(Boolean.TRUE);
        // 2.4以后这样设置 替换 addAllowedOrigin("*)
        corsConfiguration.setAllowedOriginPatterns(Arrays.asList(CorsConfiguration.ALL));
        corsConfiguration.setMaxAge(3600L);
        return corsConfiguration;
    }

    @Bean
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig()); // 4 对接口配置跨域设置
        return new CorsFilter(source);
    }

}