构建SpringBoot2.3.x源码调试环境出错

Question

从 SpringBoot2.3 开始，转为了 Gradle 构建；

我 Fork 了 SpringBoot 的源码，在 2.3.0 的分支做构建测试，build 没问题，成功了，随便选了几个 smoke-test 过程跑了下，出错：

21:05:02.976 [main] DEBUG org.springframework.web.context.support.StandardServletEnvironment - Activating profiles []

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                        

21:05:03.081 [main] INFO smoketest.actuator.ui.SampleActuatorUiApplication - Starting SampleActuatorUiApplication on bfchengnuo.local with PID 82822
21:05:03.081 [main] DEBUG smoketest.actuator.ui.SampleActuatorUiApplication - Running with Spring Boot, Spring v5.2.6.RELEASE
21:05:03.082 [main] INFO smoketest.actuator.ui.SampleActuatorUiApplication - No active profile set, falling back to default profiles: default
21:05:03.082 [main] DEBUG org.springframework.boot.SpringApplication - Loading source class smoketest.actuator.ui.SampleActuatorUiApplication
21:05:03.133 [main] DEBUG org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext - Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@33c7e1bb
21:05:03.151 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor'
21:05:03.216 [main] ERROR org.springframework.boot.SpringApplication - Application run failed
java.lang.IllegalArgumentException: No auto configuration classes found in META-INF/spring.factories. If you are using a custom packaging, make sure that file is correct.
    at org.springframework.util.Assert.notEmpty(Assert.java:464)
    at org.springframework.boot.autoconfigure.AutoConfigurationImportSelector.getCandidateConfigurations(AutoConfigurationImportSelector.java:180)
    at org.springframework.boot.autoconfigure.AutoConfigurationImportSelector.getAutoConfigurationEntry(AutoConfigurationImportSelector.java:123)
    at org.springframework.boot.autoconfigure.AutoConfigurationImportSelector$AutoConfigurationGroup.process(AutoConfigurationImportSelector.java:424)
    at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorGrouping.getImports(ConfigurationClassParser.java:878)
    at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorGroupingHandler.processGroupImports(ConfigurationClassParser.java:808)
    at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorHandler.process(ConfigurationClassParser.java:779)
    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:192)
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:319)
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:236)
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:280)
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:96)
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:706)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
    at smoketest.actuator.ui.SampleActuatorUiApplication.main(SampleActuatorUiApplication.java:46)
21:05:03.221 [main] DEBUG org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext - Closing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@33c7e1bb, started on Tue Jul 14 21:05:03 CST 2020

Process finished with exit code 1

求解。

Answer 1

已解决。

不知道是 IDEA（2020.1） 的问题还是 Gradle 的问题，是因为 spring-boot-autoconfigure 模块编译后没有生成 spring.factories 文件。

多尝试编译几次这个模块，确认文件生成后就没问题了。

PS：我重新导入编译了两次都不行，但是单独进行几次编译 spring-boot-autoconfigure 模块就 OK 了。