(lamp-gateway-server)zuihou-gateway-server 模块启动报错

[zuihou]

报错log如下：

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class [com.github.zuihou.mq.MyRabbitMqConfiguration$RabbitMqConfiguration]; nested exception is java.io.FileNotFoundException: class path resource [org/springframework/web/servlet/config/annotation/WebMvcConfigurer.class] cannot be opened because it does not exist
	at org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClassParser.java:609)
	at org.springframework.context.annotation.ConfigurationClassParser.access$800(ConfigurationClassParser.java:110)
	at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorGroupingHandler.lambda$processGroupImports$1(ConfigurationClassParser.java:811)
	at java.util.ArrayList.forEach(ArrayList.java:1249)
	at org.springframework.context.annotation.ConfigurationClassParser$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:707)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:533)
	at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.refresh(ReactiveWebServerApplicationContext.java:66)
	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.SpringApplication.run(SpringApplication.java:1226)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
	at com.github.zuihou.GatewayServerApplication.main(GatewayServerApplication.java:25)
Caused by: java.io.FileNotFoundException: class path resource [org/springframework/web/servlet/config/annotation/WebMvcConfigurer.class] cannot be opened because it does not exist
	at org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:180)
	at org.springframework.core.type.classreading.SimpleMetadataReader.getClassReader(SimpleMetadataReader.java:55)
	at org.springframework.core.type.classreading.SimpleMetadataReader.<init>(SimpleMetadataReader.java:49)
	at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:103)
	at org.springframework.boot.type.classreading.ConcurrentReferenceCachingMetadataReaderFactory.createMetadataReader(ConcurrentReferenceCachingMetadataReaderFactory.java:86)
	at org.springframework.boot.type.classreading.ConcurrentReferenceCachingMetadataReaderFactory.getMetadataReader(ConcurrentReferenceCachingMetadataReaderFactory.java:73)
	at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:81)
	at org.springframework.context.annotation.ConfigurationClassParser.asSourceClass(ConfigurationClassParser.java:695)
	at org.springframework.context.annotation.ConfigurationClassParser$SourceClass.getInterfaces(ConfigurationClassParser.java:1023)
	at org.springframework.context.annotation.ConfigurationClassParser.processInterfaces(ConfigurationClassParser.java:385)
	at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:331)
	at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:249)
	at org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClassParser.java:599)
	... 19 common frames omitted

[zuihou]

1. 检查lamp-gateway-server.yml配置是否缺少:

spring:
  autoconfigure:
    exclude: io.seata.integration.http.HttpAutoConfiguration

2. 使用IDEA Maven Helper 搜索 spring-webmvc, 有就将其排除

[zuihou]

3. 配置中禁用webmvc相关功能

lamp:
  log:
    enabled: false
  webmvc:
    enabled: false

[zuihou]

4. 报错的原因就是因为 gateway 项目启动时，加载到了WebMvcConfigurer 类， 可以通过IDEA找到WebMvcConfigurer类的源码，然后鼠标左键点击图中的图标，查看该接口有那些实现类， 并在gateway项目以及其依赖的jar中尝试寻找该实现类， 将其排除。
   

如：其中的GlobalMvcConfigurer类，位于BaseConfig中，需要将其排除

[zuihou]

如果遇到如下报错：

java.lang.IllegalStateException: Unable to load cache item
	at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:79)
	at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
	at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134)
	at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319)
	at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:572)
Caused by: java.lang.NoClassDefFoundError: org/mybatis/spring/MyBatisSystemException
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
	at java.lang.Class.getDeclaredMethods(Class.java:1975)
	at org.springframework.cglib.core.ReflectUtils.addAllMethods(ReflectUtils.java:451)
	at org.springframework.cglib.core.ReflectUtils.addAllMethods(ReflectUtils.java:455)
	at org.springframework.cglib.proxy.Enhancer.getMethods(Enhancer.java:635)
	at org.springframework.cglib.proxy.Enhancer.generateClass(Enhancer.java:670)
	at org.springframework.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33)
	at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
	at org.springframework.cglib.core.ClassLoaderAwareGeneratorStrategy.generate(ClassLoaderAwareGeneratorStrategy.java:57)
	at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:358)
	at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:585)

[zuihou]

报错原因是因为 ExceptionConfiguration 配置类中对 MyBatisSystemException 做了全局异常处理， 但lamp-gateway-server项目中却没有加入mybatis-spring的依赖。

@ExceptionHandler(MyBatisSystemException.class)
@ResponseStatus(HttpStatus.BAD_REQUEST)
public R myBatisSystemException(MyBatisSystemException ex) {
//....
}

解决方案： 在lamp-gateway-server/pom.xml 中加入依赖：

<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
</dependency>

[zuihou]

还有一种可能： 开源版 、个人版、企业版 需要在nacos创建3个命名空间，分别导入各个版本的nacos配置文件，不能混用。

若企业版读取了开源版的配置，可能出现此报错。