整合Springboot 与 nacos 遇到的问题（ClassNotFoundException ConfigurationBeanFactoryMetadata）

谁践踏了优雅 2022-09-10 08:10 267阅读 0赞

### 整合Springboot 与 nacos 遇到的问题 ###

*  一、问题日志
 *  二、问题原因

# 一、问题日志 #

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.alibaba.boot.nacos.config.binder.NacosBootConfigurationPropertiesBinder]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: org/springframework/boot/context/properties/ConfigurationBeanFactoryMetadata
    	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:221) ~[spring-beans-5.3.9.jar:5.3.9]
    	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:117) ~[spring-beans-5.3.9.jar:5.3.9]
    	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:311) ~[spring-beans-5.3.9.jar:5.3.9]
    	... 19 common frames omitted
    Caused by: java.lang.NoClassDefFoundError: org/springframework/boot/context/properties/ConfigurationBeanFactoryMetadata
    	at com.alibaba.boot.nacos.config.binder.NacosBootConfigurationPropertiesBinder.<init>(NacosBootConfigurationPropertiesBinder.java:51) ~[nacos-config-spring-boot-autoconfigure-0.2.10.jar:0.2.10]
    	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_271]
    	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_271]
    	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_271]
    	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_271]
    	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:208) ~[spring-beans-5.3.9.jar:5.3.9]
    	... 21 common frames omitted
    Caused by: java.lang.ClassNotFoundException: org.springframework.boot.context.properties.ConfigurationBeanFactoryMetadata
    	at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[na:1.8.0_271]
    	at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[na:1.8.0_271]
    	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355) ~[na:1.8.0_271]
    	at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[na:1.8.0_271]
    	... 27 common frames omitted

# 二、问题原因 #

原因是我的spring boot版本是2.5.3 , nacos config的版本是0.2.10  
两个版本不兼容导致，在spring boot 2.4之后删掉了ConfigurationBeanFactoryMetadata  
将spring boot版本降级为2.4之前即可解决.我测试改成如下版本

<parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.2.5.RELEASE</version>
            <relativePath/> 
        </parent>

注意：我的IDEA版本为2020.3 要清除缓存才会生效，操作如下：

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5bGx5beF_size_20_color_FFFFFF_t_70_g_se_x_16]

[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5bGx5beF_size_20_color_FFFFFF_t_70_g_se_x_16]: /images/20220829/92ab169f7a284ee8b5e4ef33605b9481.png