spring-boot-starter : java.lang.IllegalStateException: Failed to load ApplicationContext

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在本文中，我们将探讨一个关于Spring Boot项目中自定义配置加载的问题。作者在尝试创建一个Spring Boot Starter项目并编写自己的第三方插件包时遇到了问题。代码片段展示了配置类`HelloServiceAutoConfiguration`，它使用`@ConfigurationProperties`注解来尝试加载`SpringDemo`类的配置。然而，运行测试时出现了`NoConfigurationProperties annotation found on 'com.able.spring.data.SpringDemo'.`的异常。错误表明`SpringDemo`类上缺少`ConfigurationProperties`注解，导致配置加载失败。解决方案是为`SpringDemo`类添加适当的注解以使Spring能够正确识别和加载配置。

项目介绍:

自己搭建一个spring-boot-starter项目,自己写一个第三方的插件包供自己使用

代码片段如下:

@Configuration//标记该类是一个配置类
@ConditionalOnWebApplication//标记该自动配置类只有在 Web应用下才会生效
@EnableConfigurationProperties(SpringDemo.class)//开启自动属性配置
public class HelloServiceAutoConfiguration {

    @Bean//使用@Bean注解将该Bean注册到IOC容器中
    public SpringDemo helloService(){
        SpringDemo springDemo = new SpringDemo();
        //通过setHelloProperties()的方式来配置自定义属性值
        return springDemo;
    }
}

SpringDemo.java代码如下:

public class SpringDemo {

	private String aa="aa";

	private String bb = "bb";

	public void getDemo(){
		System.out.println(aa+","+bb);
	}

}

报错代码如下:

java.lang.IllegalStateException: Failed to load ApplicationContext

	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:132)
	at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:123)
	at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:190)
	at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:132)
	at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:244)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: java.lang.IllegalStateException: No ConfigurationProperties annotation found on  'com.able.spring.data.SpringDemo'.
	at org.springframework.util.Assert.state(Assert.java:94)
	at org.springframework.boot.context.properties.ConfigurationPropertiesBeanRegistrar.registerBeanDefinition(ConfigurationPropertiesBeanRegistrar.java:85)
	at org.springframework.boot.context.properties.ConfigurationPropertiesBeanRegistrar.register(ConfigurationPropertiesBeanRegistrar.java:59)
	at org.springframework.boot.context.properties.ConfigurationPropertiesBeanRegistrar.register(ConfigurationPropertiesBeanRegistrar.java:53)
	at java.lang.Iterable.forEach(Iterable.java:75)
	at org.springframework.boot.context.properties.EnableConfigurationPropertiesRegistrar.registerBeanDefinitions(EnableConfigurationPropertiesRegistrar.java:40)
	at org.springframework.context.annotation.ImportBeanDefinitionRegistrar.registerBeanDefinitions(ImportBeanDefinitionRegistrar.java:86)
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.lambda$loadBeanDefinitionsFromRegistrars$1(ConfigurationClassBeanDefinitionReader.java:385)
	at java.util.LinkedHashMap.forEach(LinkedHashMap.java:684)
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsFromRegistrars(ConfigurationClassBeanDefinitionReader.java:384)
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:148)
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:120)
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:331)
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:236)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95)
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:706)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
	at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:126)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)
	... 24 more

No ConfigurationProperties annotation found on 'com.able.spring.data.SpringDemo'. 关键这句异常,很重要

这里是我使用加载配置文件 @EnableConfigurationProperties(SpringDemo.class)//开启自动属性配置

但是我在SpringDemo 中未加载配置文件

很明显在这里加载了配置文件,所以引发No ConfigurationProperties annotation found on 'com.able.spring.data.SpringDemo'.

去掉对@EnableConfigurationProperties注解,后续有要配置文件从读取数据再次配置