14-异常-NoSuchBeanDefinitionException No qualifying bean of type 'cn.hutool.core.l

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14-异常-NoSuchBeanDefinitionException No qualifying bean of type 'cn.hutool.core.lang.Snowflake' available expected at least 1 bean which qualifies as autowire candidate

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问题描述：最近项目组加入了新的开发，由于项目有多个服务，有些服务不是公用，当他在其他服务直接注入没有引入对应模块的配置时，出现了下面的报错。

import cn.hutool.core.lang.Snowflake;
​
@Resource 
private Snowflake snowflake;

报错信息：

rg.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'cn.hutool.core.lang.Snowflake' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1695) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1253) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:636) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:397) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1429) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
    at com.xxx.dispatxxxch.XXXXApplication.main(XXXXApplication.java:19) [classes/:?]
​
2024-06-28 09:55:23.057 ERROR 24856 --- [           main] org.springframework.boot.diagnostics.LoggingFailureAnalysisReporter.report(LoggingFailureAnalysisReporter.java:40) :
​
***************************
APPLICATION FAILED TO START
***************************
​
Description:
​
Field snowflake in com.xxx.XXX required a bean of type 'cn.hutool.core.lang.Snowflake' that could not be found.
​
The injection point has the following annotations:
    - @org.springframework.beans.factory.annotation.Autowired(required=true)
​
​
Action:
​
Consider defining a bean of type 'cn.hutool.core.lang.Snowflake' in your configuration.
​
​
Process finished with exit code 130

错误原因：编写代码的模块的服务并未引入有 Snowflake 配置的模块内容。

解决方案：

错误信息表明，Spring Boot 无法找到类型为 cn.hutool.core.lang.Snowflake 的 bean 以注入到一个类的字段中。要解决此问题，您需要在 Spring 配置中定义一个 Snowflake bean。

以下是定义 Snowflake bean 的步骤：

  1. 创建配置类:

    • 定义一个配置类，在其中创建一个 Snowflake bean。

  2. 定义 Snowflake Bean:

    • 使用 @Bean 注解创建和配置 Snowflake bean。

配置类示例

创建一个新的 Java 类，例如 SnowflakeConfig，并使用 @Configuration 注解。

import cn.hutool.core.lang.Snowflake;
import cn.hutool.core.util.IdUtil;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
​
@Configuration
public class SnowflakeConfig {
​
    @Bean
    public Snowflake snowflake() {
        // 根据需要自定义 workerId 和 datacenterId
        return IdUtil.createSnowflake(1, 1);
    }
}

确保组件扫描

确保您的主应用程序类或其他配置类包含 SnowflakeConfig 所在包的组件扫描。默认情况下，Spring Boot 扫描主应用程序类的包及其子包。

例如，如果您的 SnowflakeConfig 在 com.xxx.config 包中，而您的主应用程序类在 com.xxx 包中，您不需要做任何特别的操作。但是，如果它们在不同的包中，您可能需要指定组件扫描的基础包。

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
​
@SpringBootApplication
@ComponentScan(basePackages = {"com.xxx", "com.xxx.config"}) // 根据需要调整包名称
public class XxxAppApplication {
    public static void main(String[] args) {
        SpringApplication.run(XxxAppApplication.class, args);
    }
}

总结

通过在配置类中定义 Snowflake bean 并确保您的应用程序扫描适当的包，您应该能够解决 NoSuchBeanDefinitionException 错误。

14-异常-NoSuchBeanDefinitionException No qualifying bean of type 'cn.hutool.core.lang.Snowflake' available expected at least 1 bean which qualifies as autowire candidate.png

上图是由 Pic 生成的

关键词：A proud wolf dog stands in the boundless desert waiting for death

更多内容欢迎关注我（持续更新中，欢迎Star✨）

Github：CodeZeng1998/Java-Developer-Work-Note

技术公众号：CodeZeng1998（纯纯技术文）

生活公众号：好锅（Life is more than code）

CSDN: CodeZeng1998

其他平台：CodeZeng1998、好锅

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