Spring Boot Eureka客户端LoadBalancerAutoConfiguration加载异常求助

开发Spring Boot集成Eureka Discovery Client的应用时，启动过程中出现LoadBalancerAutoConfiguration相关异常，错误栈显示无法找到org.springframework.beans.factory.aot.BeanRegistrationAotProcessor类。

完整错误信息 #

java.lang.IllegalStateException: Failed to introspect Class [org.springframework.cloud.loadbalancer.config.LoadBalancerAutoConfiguration] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader@4b1210ee]
at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:485) ~[spring-core-5.3.27.jar:5.3.27]
at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:361) ~[spring-core-5.3.27.jar:5.3.27]
at org.springframework.util.ReflectionUtils.getUniqueDeclaredMethods(ReflectionUtils.java:418) ~[spring-core-5.3.27.jar:5.3.27]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.lambda$getTypeForFactoryMethod$2(AbstractAutowireCapableBeanFactory.java:765) ~[spring-beans-5.3.27.jar:5.3.27]
at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1708) ~[na:na]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryMethod(AbstractAutowireCapableBeanFactory.java:764) ~[spring-beans-5.3.27.jar:5.3.27]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:703) ~[spring-beans-5.3.27.jar:5.3.27]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:674) ~[spring-beans-5.3.27.jar:5.3.27]
at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1684) ~[spring-beans-5.3.27.jar:5.3.27]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:570) ~[spring-beans-5.3.27.jar:5.3.27]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:542) ~[spring-beans-5.3.27.jar:5.3.27]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:669) ~[spring-beans-5.3.27.jar:5.3.27]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:661) ~[spring-beans-5.3.27.jar:5.3.27]
at org.springframework.context.support.AbstractApplicationContext.getBeansOfType(AbstractApplicationContext.java:1302) ~[spring-context-5.3.27.jar:5.3.27]
at org.springframework.boot.SpringApplication.getExitCodeFromMappedException(SpringApplication.java:864) ~[spring-boot-2.7.11.jar:2.7.11]
at org.springframework.boot.SpringApplication.getExitCodeFromException(SpringApplication.java:852) ~[spring-boot-2.7.11.jar:2.7.11]
at org.springframework.boot.SpringApplication.handleExitCode(SpringApplication.java:839) ~[spring-boot-2.7.11.jar:2.7.11]
at org.springframework.boot.SpringApplication.handleRunFailure(SpringApplication.java:779) ~[spring-boot-2.7.11.jar:2.7.11]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:317) ~[spring-boot-2.7.11.jar:2.7.11]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1303) ~[spring-boot-2.7.11.jar:2.7.11]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1292) ~[spring-boot-2.7.11.jar:2.7.11]
at org.sid.BillingServiceApplication.main(BillingServiceApplication.java:10) ~[classes/:na]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:577) ~[na:na]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.7.11.jar:2.7.11]
Caused by: java.lang.NoClassDefFoundError: org/springframework/beans/factory/aot/BeanRegistrationAotProcessor
at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[na:na]
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1013) ~[na:na]
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[na:na]
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:862) ~[na:na]
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:760) ~[na:na]
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:681) ~[na:na]
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:639) ~[na:na]
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188) ~[na:na]
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na]
at java.base/java.lang.Class.getDeclaredMethods0(Native Method) ~[na:na]
at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3434) ~[na:na]
at java.base/java.lang.Class.getDeclaredMethods(Class.java:2536) ~[na:na]
at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:467) ~[spring-core-5.3.27.jar:5.3.27]
... 24 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.springframework.beans.factory.aot.BeanRegistrationAotProcessor
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) ~[na:na]
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188) ~[na:na]
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na]
... 37 common frames omitted

项目配置文件 #

pom.xml片段 #

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web-services</artifactId>
    </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>
            <configuration>
                <excludes>
                    <exclude>
                        <groupId>org.projectlombok</groupId>
                        <artifactId>lombok</artifactId>
                    </exclude>
                </excludes>
            </configuration>
        </plugin>
    </plugins>
</build>

主启动类代码 #

package org.sid;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
@EnableFeignClients
public class BillingServiceApplication {

    public static void main(String[] args) {
        SpringApplication.run(BillingServiceApplication.class, args);
    }

}

application.properties内容 #

</project>

解决方案 #

1. 修正Spring Cloud版本兼容性 #

Spring Boot 2.7.11对应的官方兼容Spring Cloud版本为2021.0.6（Jubilee），在pom.xml的<properties>节点中添加版本配置：

<properties>
    <spring-cloud.version>2021.0.6</spring-cloud.version>
</properties>

2. 添加Eureka Discovery Client核心依赖 #

当前pom.xml缺少Eureka Client依赖，导致Spring Cloud LoadBalancer自动配置类依赖缺失，添加以下依赖：

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>

3. 修复application.properties配置 #

删除错误的</project>标签，添加Eureka客户端必要配置：

# Eureka服务注册中心地址
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/
# 当前应用名称
spring.application.name=billing-service

4. 清理并重新构建项目 #

执行Maven命令清理本地缓存，重新下载依赖并构建：

mvn clean install

内容的提问来源于stack exchange，提问作者Mohamed Amin Hkimi