Question

我正在使用Spring Boot 2.2.7.RELEASE，并且一切正常。当我升级到Spring Boot 2.3.0.RELEASE时，出现了一些问题，除此之外，我能够解决它们。

我上了这个课：

@Configuration
@EnableCaching
public class CacheConfiguration extends CachingConfigurerSupport {

    public static final String PROPERTY_RESOLVING_CACHE_RESOLVER_BEAN_NAME = "propertyResolvingCacheResolver";

    @Value("${my.cache.name}")
    private String myCacheName;

    @Autowired
    private Environment environment;

    @Bean(PROPERTY_RESOLVING_CACHE_RESOLVER_BEAN_NAME)
    @Override
    public CacheResolver cacheResolver() {
        return new PropertyResolvingCacheResolver(cacheManager(), environment);
    }

    @Bean
    public CacheManager cacheManager() {
        SimpleCacheManager cacheManager = new SimpleCacheManager();
        cacheManager.setCaches(Arrays.asList(new ConcurrentMapCache(myCacheName))); 
        return cacheManager;
    }
}

我得到的错误是：

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'environment' available
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:814)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1282)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:297)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$ShortcutDependencyDescriptor.resolveShortcut(AutowiredAnnotationBeanPostProcessor.java:796)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1238)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1226)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.resolvedCachedArgument(AutowiredAnnotationBeanPostProcessor.java:601)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.access$000(AutowiredAnnotationBeanPostProcessor.java:131)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:631)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
    ... 66 common frames omitted

我认为这是咖啡豆的'生命周期'的问题，而且我的自动接线时间太早，所以我这样做了：

public class CacheConfiguration extends CachingConfigurerSupport implements EnvironmentAware {
 ...
 private Environment environment;
 ...
    @Override
    public void setEnvironment(Environment environment) {
        this.environment = environment;
    }
 ...

但是随后，其他问题开始出现（执行上述操作之后），例如：

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'org.springframework.context.annotation.ConfigurationClassPostProcessor.importRegistry' available
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:814)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1282)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:297)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207)
    at org.springframework.context.annotation.ConfigurationClassPostProcessor$ImportAwareBeanPostProcessor.postProcessBeforeInitialization(ConfigurationClassPostProcessor.java:456)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:416)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1788)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595)
    ... 45 common frames omitted

这已经脱离了我的联盟，任何帮助将不胜感激，谢谢！

编辑1：
经过一番试验后，问题是因为此bean @Bean(PROPERTY_RESOLVING_CACHE_RESOLVER_BEAN_NAME)的创建被推迟到以后的时间。

它曾经在cacheManager之后创建，但是在2.3.0.RELEASE中不再存在。

编辑2：
对于DataSourceHealthIndicator和dbHealthContributor，2.2.7.RELEASE在应用程序上下文中都具有bean名称2.3.0.RELEASE。

这可以在/ actuator / beans下看到：

 "dbHealthContributor": {
     "aliases": [],
     "scope": "singleton",
     "type": "org.springframework.boot.actuate.jdbc.DataSourceHealthIndicator",
     "resource": "class path resource [org/springframework/boot/actuate/autoconfigure/jdbc/DataSourceHealthContributorAutoConfiguration.class]",
     "dependencies": [
         "dataSource"
     ]
 },

Answer 1

游戏有点晚了，但是我在将 Spring Boot 从 2.2.0 升级到 2.3.0 时遇到了同样的问题。您还可以使用 Spring 的 @Lazy 注释来解决该问题。这样 DataSourceHealthIndicator 将在稍后实际使用时自动装配，到那时自动配置将使其可用于自动装配。而且您不必像在答案中那样定义自己的 bean。

所以代替

@Autowired
private DataSourceHealthIndicator dataSourceHealthIndicator;

，你会使用

@Autowired
@Lazy
private DataSourceHealthIndicator dataSourceHealthIndicator;

Answer 2

通过在trace=true中拥有application.properties，我设法找出了问题所在。

我曾经有过这项工作（Spring Boot免费提供）：

@Autowired
private DataSourceHealthIndicator dataSourceHealthIndicator;

但是似乎dataSourceHealthIndicator的创建已被延迟，因此在创建需要它的bean时，找不到它并且自动装配失败。 br />

因此，我手动创建了它们 ：

@Bean
@Primary
public DataSourceHealthIndicator dataSourceHealthIndicator(DataSource dataSource) {

    return new DataSourceHealthIndicator(dataSource, "SELECT 1 FROM DUAL");
}

我的错误消失了。

我希望能够了解发生了什么事 dataSourceHealthIndicator和2.2.7.RELEASE之间的2.3.0.RELEASE {{1}}。我没有看到关于它的任何提及 Spring-Boot-2.3-Release-Notes 或我错过了它，但仍然可以看到它是“被创建的”-请参阅我的问题中的编辑2 。

将Spring Boot 2.2.7升级到Spring Boot 2.3.0时出错

2 个答案: