【springcloud】使用@FEIGNCLIENT时,报JAVA.LANG.NOCLASSDEFFOUNDERROR: FEIGN/FEIGN$BUILDER错

本文介绍了在使用 Feign 时遇到的 ClassNotFoundException 错误及其解决方法。通过在项目的 pom 文件中添加 spring-cloud-starter-feign 依赖,可以有效解决因缺少 feign 相关 jar 包导致的问题。

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引用地址:http://www.cnblogs.com/ellacan/p/8822374.html

 

错误信息:

Caused by: java.lang.ClassNotFoundException: feign.Feign$Builder
at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_60]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_60]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) ~[na:1.8.0_60]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_60]
... 39 common frames omitted

错误分析:

缺少了对应feign的jar包

解决办法:

在对应工程的pom文件中导入jar包

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-feign</artifactId>
</dependency>

 

转载于:https://www.cnblogs.com/sxdcgaq8080/p/8940472.html

2025-07-14 14:55:12,585 WARN org.springframework.context.support.AbstractApplicationContext 633 [main] refresh - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'messageConverters' defined in class path resource [com/huawei/apaas/wiseagent/common/feignclient/FeignConfig.class]: Failed to instantiate [org.springframework.boot.autoconfigure.http.HttpMessageConverters]: Factory method 'messageConverters' threw exception with message: Error creating bean with name 'mappingJackson2HttpMessageConverter' defined in class path resource [org/springframework/boot/autoconfigure/http/JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration.class]: Unsatisfied dependency expressed through method 'mappingJackson2HttpMessageConverter' parameter 0: Error creating bean with name 'jacksonObjectMapper' defined in class path resource [org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$JacksonObjectMapperConfiguration.class]: Failed to instantiate [com.fasterxml.jackson.databind.ObjectMapper]: Factory method 'jacksonObjectMapper' threw exception with message: 'com.fasterxml.jackson.core.StreamReadConstraints$Builder com.fasterxml.jackson.core.StreamReadConstraints$Builder.maxToken*****#*#***** Error starting ApplicationContext. To display the condition evaluation report re-run your application with 'debug' enabled. 2025-07-14 14:55:12,618 ERROR org.springframework.boot.diagnostics.LoggingFailureAnalysisReporter 40 [main] report - [N] [N] ***************************[N] APPLICATION FAILED TO START[N] ***************************[N] [N] Description:[N] [N] An attempt was made to call a method that does not exist. The attempt was made from the following location:[N] [N] com.huawei.clouds.wushan.security.CommonSecurityValidatorAutoConfiguration.lambda$jackson2ObjectMapperBuilderCustomizer$0(CommonSecurityValidatorA
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