Spring Cloud Eureka创建问题
Spring Cloud Eureka创建问题1、问题描述2、问题分析3、问题解决4、总结1、问题描述Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.2020-04-27 20:38:52.876 ERROR 942...
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1、问题描述
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-04-27 20:38:52.876 ERROR 9428 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class [com.example.demo1.Demo1Application]; nested exception is java.lang.ArrayStoreException: sun.reflect.annotation.TypeNotPresentExceptionProxy
at org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClassParser.java:609) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.access$800(ConfigurationClassParser.java:110) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorGroupingHandler.lambda$processGroupImports$1(ConfigurationClassParser.java:811) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at java.util.ArrayList.forEach(ArrayList.java:1257) ~[na:1.8.0_191]
at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorGroupingHandler.processGroupImports(ConfigurationClassParser.java:808) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorHandler.process(ConfigurationClassParser.java:779) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:192) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:319) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:236) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:706) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at com.example.demo1.Demo1Application.main(Demo1Application.java:12) [classes/:na]
Caused by: java.lang.ArrayStoreException: sun.reflect.annotation.TypeNotPresentExceptionProxy
at sun.reflect.annotation.AnnotationParser.parseClassArray(AnnotationParser.java:724) ~[na:1.8.0_191]
at sun.reflect.annotation.AnnotationParser.parseArray(AnnotationParser.java:531) ~[na:1.8.0_191]
at sun.reflect.annotation.AnnotationParser.parseMemberValue(AnnotationParser.java:355) ~[na:1.8.0_191]
at sun.reflect.annotation.AnnotationParser.parseAnnotation2(AnnotationParser.java:286) ~[na:1.8.0_191]
at sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:120) ~[na:1.8.0_191]
at sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:72) ~[na:1.8.0_191]
at java.lang.Class.createAnnotationData(Class.java:3521) ~[na:1.8.0_191]
at java.lang.Class.annotationData(Class.java:3510) ~[na:1.8.0_191]
at java.lang.Class.getDeclaredAnnotations(Class.java:3477) ~[na:1.8.0_191]
at org.springframework.core.annotation.AnnotationsScanner.getDeclaredAnnotations(AnnotationsScanner.java:499) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.core.annotation.AnnotationTypeMappings.addMetaAnnotationsToQueue(AnnotationTypeMappings.java:85) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.core.annotation.AnnotationTypeMappings.addAllMappings(AnnotationTypeMappings.java:79) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.core.annotation.AnnotationTypeMappings.<init>(AnnotationTypeMappings.java:68) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.core.annotation.AnnotationTypeMappings.<init>(AnnotationTypeMappings.java:46) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.core.annotation.AnnotationTypeMappings$Cache.createMappings(AnnotationTypeMappings.java:251) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at java.util.concurrent.ConcurrentMap.computeIfAbsent(ConcurrentMap.java:324) ~[na:1.8.0_191]
at org.springframework.core.annotation.AnnotationTypeMappings$Cache.get(AnnotationTypeMappings.java:247) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.core.annotation.AnnotationTypeMappings.forAnnotationType(AnnotationTypeMappings.java:204) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.core.annotation.AnnotationTypeMappings.forAnnotationType(AnnotationTypeMappings.java:186) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.core.annotation.AnnotationTypeMappings.forAnnotationType(AnnotationTypeMappings.java:173) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.core.annotation.TypeMappedAnnotation.of(TypeMappedAnnotation.java:634) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.core.annotation.MergedAnnotation.of(MergedAnnotation.java:596) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.core.type.classreading.MergedAnnotationReadingVisitor.visitEnd(MergedAnnotationReadingVisitor.java:96) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.asm.ClassReader.readElementValues(ClassReader.java:2985) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.asm.ClassReader.accept(ClassReader.java:582) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.asm.ClassReader.accept(ClassReader.java:401) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.core.type.classreading.SimpleMetadataReader.<init>(SimpleMetadataReader.java:50) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:103) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.boot.type.classreading.ConcurrentReferenceCachingMetadataReaderFactory.createMetadataReader(ConcurrentReferenceCachingMetadataReaderFactory.java:86) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at org.springframework.boot.type.classreading.ConcurrentReferenceCachingMetadataReaderFactory.getMetadataReader(ConcurrentReferenceCachingMetadataReaderFactory.java:73) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:81) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.asSourceClass(ConfigurationClassParser.java:695) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser$SourceClass.getMemberClasses(ConfigurationClassParser.java:992) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processMemberClasses(ConfigurationClassParser.java:354) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:271) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:249) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClassParser.java:599) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
... 19 common frames omitted
Process finished with exit code 1
2、问题分析
以上错误日志是由于在idea中错误创建Spring Cloud工程导致的。。
3、问题解决
下面一步步有图有真相的新建工程。首先新建module。
然后选择 Spring Initializr,单击next。
输入项目名称,单击next。
这里注意了，我们不能和Spring Boot新建工程一样了，毕竟我们已经是Spring Cloud了是吧！这里我们需要选择Spring Cloud Discovery，然后选择右边的Eureka Server,单击next,再finish即可。
这是完整的工程结构。
修改主程序EurekaServerApplication,配置Eureka信息。主要是加了@EnableEurekaServer注解。
package com.example.eureka_server;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaServerApplication.class, args);
}
}
接着修改配置文件application.yml。
server:
port: 8763
spring:
application:
name: euraka-service
eureka:
instance:
hostname: standalone
client:
register-with-eureka: false
fetch-registry: false
service-url:
defaultZone: http://${eureka.instance.hostname}:${server.port}/euraka/
完整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>2.2.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>eureka_server</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>eureka_server</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Hoxton.SR3</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</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>
接着启动工程即可。控制台输出如下：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.6.RELEASE)
2020-04-27 20:53:17.603 INFO 9704 --- [ main] c.e.e.EurekaServerApplication : No active profile set, falling back to default profiles: default
2020-04-27 20:53:18.542 WARN 9704 --- [ main] o.s.boot.actuate.endpoint.EndpointId : Endpoint ID 'service-registry' contains invalid characters, please migrate to a valid format.
2020-04-27 20:53:18.713 INFO 9704 --- [ main] o.s.cloud.context.scope.GenericScope : BeanFactory id=afc60cde-ce69-3e9d-b165-4575cab97100
2020-04-27 20:53:19.139 INFO 9704 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8763 (http)
2020-04-27 20:53:19.156 INFO 9704 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-04-27 20:53:19.157 INFO 9704 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.33]
2020-04-27 20:53:19.317 INFO 9704 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-04-27 20:53:19.317 INFO 9704 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1693 ms
2020-04-27 20:53:19.452 WARN 9704 --- [ main] c.n.c.sources.URLConfigurationSource : No URLs will be polled as dynamic configuration sources.
2020-04-27 20:53:19.452 INFO 9704 --- [ main] c.n.c.sources.URLConfigurationSource : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.
2020-04-27 20:53:19.464 INFO 9704 --- [ main] c.netflix.config.DynamicPropertyFactory : DynamicPropertyFactory is initialized with configuration sources: com.netflix.config.ConcurrentCompositeConfiguration@444cc791
2020-04-27 20:53:20.486 INFO 9704 --- [ main] c.s.j.s.i.a.WebApplicationImpl : Initiating Jersey application, version 'Jersey: 1.19.1 03/11/2016 02:08 PM'
2020-04-27 20:53:20.706 INFO 9704 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using JSON encoding codec LegacyJacksonJson
2020-04-27 20:53:20.707 INFO 9704 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using JSON decoding codec LegacyJacksonJson
2020-04-27 20:53:20.823 INFO 9704 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using XML encoding codec XStreamXml
2020-04-27 20:53:20.824 INFO 9704 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using XML decoding codec XStreamXml
2020-04-27 20:53:21.151 WARN 9704 --- [ main] c.n.c.sources.URLConfigurationSource : No URLs will be polled as dynamic configuration sources.
2020-04-27 20:53:21.151 INFO 9704 --- [ main] c.n.c.sources.URLConfigurationSource : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.
2020-04-27 20:53:21.317 INFO 9704 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-04-27 20:53:22.254 WARN 9704 --- [ main] ockingLoadBalancerClientRibbonWarnLogger : You already have RibbonLoadBalancerClient on your classpath. It will be used by default. As Spring Cloud Ribbon is in maintenance mode. We recommend switching to BlockingLoadBalancerClient instead. In order to use it, set the value of `spring.cloud.loadbalancer.ribbon.enabled` to `false` or remove spring-cloud-starter-netflix-ribbon from your project.
2020-04-27 20:53:22.307 INFO 9704 --- [ main] o.s.c.n.eureka.InstanceInfoFactory : Setting initial instance status as: STARTING
2020-04-27 20:53:22.334 INFO 9704 --- [ main] com.netflix.discovery.DiscoveryClient : Initializing Eureka in region us-east-1
2020-04-27 20:53:22.334 INFO 9704 --- [ main] com.netflix.discovery.DiscoveryClient : Client configured to neither register nor query for data.
2020-04-27 20:53:22.341 INFO 9704 --- [ main] com.netflix.discovery.DiscoveryClient : Discovery Client initialized at timestamp 1587992002340 with initial instances count: 0
2020-04-27 20:53:22.402 INFO 9704 --- [ main] c.n.eureka.DefaultEurekaServerContext : Initializing ...
2020-04-27 20:53:22.407 WARN 9704 --- [ main] c.n.eureka.cluster.PeerEurekaNodes : The replica size seems to be empty. Check the route 53 DNS Registry
2020-04-27 20:53:22.445 INFO 9704 --- [ main] c.n.e.registry.AbstractInstanceRegistry : Finished initializing remote region registries. All known remote regions: []
2020-04-27 20:53:22.447 INFO 9704 --- [ main] c.n.eureka.DefaultEurekaServerContext : Initialized
2020-04-27 20:53:22.472 INFO 9704 --- [ main] o.s.b.a.e.web.EndpointLinksResolver : Exposing 2 endpoint(s) beneath base path '/actuator'
2020-04-27 20:53:22.527 INFO 9704 --- [ main] o.s.c.n.e.s.EurekaServiceRegistry : Registering application EURAKA-SERVICE with eureka with status UP
2020-04-27 20:53:22.554 INFO 9704 --- [ Thread-26] o.s.c.n.e.server.EurekaServerBootstrap : Setting the eureka configuration..
2020-04-27 20:53:22.555 INFO 9704 --- [ Thread-26] o.s.c.n.e.server.EurekaServerBootstrap : Eureka data center value eureka.datacenter is not set, defaulting to default
2020-04-27 20:53:22.556 INFO 9704 --- [ Thread-26] o.s.c.n.e.server.EurekaServerBootstrap : Eureka environment value eureka.environment is not set, defaulting to test
2020-04-27 20:53:22.607 INFO 9704 --- [ Thread-26] o.s.c.n.e.server.EurekaServerBootstrap : isAws returned false
2020-04-27 20:53:22.608 INFO 9704 --- [ Thread-26] o.s.c.n.e.server.EurekaServerBootstrap : Initialized server context
2020-04-27 20:53:22.608 INFO 9704 --- [ Thread-26] c.n.e.r.PeerAwareInstanceRegistryImpl : Got 1 instances from neighboring DS node
2020-04-27 20:53:22.609 INFO 9704 --- [ Thread-26] c.n.e.r.PeerAwareInstanceRegistryImpl : Renew threshold is: 1
2020-04-27 20:53:22.611 INFO 9704 --- [ Thread-26] c.n.e.r.PeerAwareInstanceRegistryImpl : Changing status to UP
2020-04-27 20:53:22.636 INFO 9704 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8763 (http) with context path ''
2020-04-27 20:53:22.637 INFO 9704 --- [ main] .s.c.n.e.s.EurekaAutoServiceRegistration : Updating port to 8763
2020-04-27 20:53:22.644 INFO 9704 --- [ Thread-26] e.s.EurekaServerInitializerConfiguration : Started Eureka Server
2020-04-27 20:53:23.571 INFO 9704 --- [ main] c.e.e.EurekaServerApplication : Started EurekaServerApplication in 8.898 seconds (JVM running for 10.304)
服务成功启动，接下来访问该网站测试是否真的启动成功。在浏览器地址栏输入http://localhost:8763/。
可以访问。
4、总结
书上的代码直接运行绝大部分是对的，但是总有一些软件的更新使得作者无能为力。之前的API是对的，但是之后就废弃了或修改了是常有的事。所以我们需要跟踪源代码。这只是一个小小的问题，如果没有前辈的无私奉献，很难想象我们自己一天能学到多少内容。感谢各位前辈的辛勤付出，让我们少走了很多的弯路！
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