java.lang.NoClassDefFoundError: feign/Request$Options - spring

Question

I am creating project using Spring Boot, trying use feign to communicate between multiple microservices. I have added
#EnableFeignClients over spring application but as soon as I added #FeignClient to create feign client I am getting "java.lang.NoClassDefFoundError: feign/Request$Options" exception.
CurrencyConversionServiceApplication.class :
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;
#SpringBootApplication
#EnableFeignClients
public class CurrencyConversionServiceApplication {
public static void main(String[] args) {
SpringApplication.run(CurrencyConversionServiceApplication.class, args);
}
}
CurrencyExchangeProxy.class :
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import com.pavan.microservices.currencyconversionservice.bean.CurrencyConversion;
#FeignClient(value="currency-exchange",name="currency-exchange", url="localhost:8000")
public interface CurrencyExchangeProxy {
#GetMapping("/currency-exchange/from/{from}/to/{to}")
public CurrencyConversion retrieveExchangeValue(#PathVariable String from, #PathVariable String to);
}
pom.xml :
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.6.1</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.pavan.microservices</groupId>
<artifactId>currency-conversion-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>currency-conversion-service</name>
<description>Currency Conversion Service</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>2021.0.0</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Error while Starting Application :
java.lang.NoClassDefFoundError: feign/Request$Options
at org.springframework.cloud.openfeign.FeignClientFactoryBean.<init>(FeignClientFactoryBean.java:104) ~[spring-cloud-openfeign-core-3.1.0.jar:3.1.0]
at org.springframework.cloud.openfeign.FeignClientsRegistrar.registerFeignClient(FeignClientsRegistrar.java:215) ~[spring-cloud-openfeign-core-3.1.0.jar:3.1.0]
at org.springframework.cloud.openfeign.FeignClientsRegistrar.registerFeignClients(FeignClientsRegistrar.java:202) ~[spring-cloud-openfeign-core-3.1.0.jar:3.1.0]
at org.springframework.cloud.openfeign.FeignClientsRegistrar.registerBeanDefinitions(FeignClientsRegistrar.java:151) ~[spring-cloud-openfeign-core-3.1.0.jar:3.1.0]
at org.springframework.context.annotation.ImportBeanDefinitionRegistrar.registerBeanDefinitions(ImportBeanDefinitionRegistrar.java:86) ~[spring-context-5.3.13.jar:5.3.13]
at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.lambda$loadBeanDefinitionsFromRegistrars$1(ConfigurationClassBeanDefinitionReader.java:396) ~[spring-context-5.3.13.jar:5.3.13]
at java.util.LinkedHashMap.forEach(Unknown Source) ~[na:1.8.0_73]
at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsFromRegistrars(ConfigurationClassBeanDefinitionReader.java:395) ~[spring-context-5.3.13.jar:5.3.13]
at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:157) ~[spring-context-5.3.13.jar:5.3.13]
at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:129) ~[spring-context-5.3.13.jar:5.3.13]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:343) ~[spring-context-5.3.13.jar:5.3.13]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:247) ~[spring-context-5.3.13.jar:5.3.13]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:311) ~[spring-context-5.3.13.jar:5.3.13]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:112) ~[spring-context-5.3.13.jar:5.3.13]
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:746) ~[spring-context-5.3.13.jar:5.3.13]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:564) ~[spring-context-5.3.13.jar:5.3.13]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.6.1.jar:2.6.1]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:730) [spring-boot-2.6.1.jar:2.6.1]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412) [spring-boot-2.6.1.jar:2.6.1]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:302) [spring-boot-2.6.1.jar:2.6.1]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1301) [spring-boot-2.6.1.jar:2.6.1]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1290) [spring-boot-2.6.1.jar:2.6.1]
at com.pavan.microservices.currencyconversionservice.CurrencyConversionServiceApplication.main(CurrencyConversionServiceApplication.java:12) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_73]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_73]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_73]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_73]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.6.1.jar:2.6.1]
Caused by: java.lang.ClassNotFoundException: feign.Request$Options
at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_73]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_73]
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[na:1.8.0_73]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_73]
... 28 common frames omitted

Answer 1

I have also faced this issue while following up the In28Minutes spring microservice course.
What I have noticed that Request class under the Fiegn jar is not loaded properly hence it is giving this error.
I think maven was not able to download the jar properly.
So I have deleted the .m2 folder available under "my home directory"/.m2 for e.g C:/Users/userName/.m2 and then select the project in eclipse >> right click >> Maven >> Update Project >> select Force Update of Snapshots/Releases and click on OK.
It downloads the maven dependency again and able to start the service in eclipse without this error.
Able to open the Request class in eclipse this time.

Answer 2

Try to update the dependency with the latest version-
https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-openfeign/3.1.4
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
<version>3.1.4</version>
</dependency>
Worked for me!!