spring - 由 : java. lang.NoClassDefFoundError 引起:org/springframework/boot/bind/RelaxedPropertyResolver - 微服务

Question

我正在从事 Spring Boot + 微服务 项目。在这个项目中，开发了"microservices-dashboard"项目。

当我简单地运行这个项目时，发现以下错误。我正在使用 spring-boot-starter-parent至<version>2.0.4.RELEASE</version>

错误:

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class [com.its.MicroservicesDashboardApplication]; nested exception is java.lang.IllegalStateException: Could not evaluate condition on de.codecentric.boot.admin.config.SpringBootAdminClientAutoConfiguration due to org/springframework/boot/bind/RelaxedPropertyResolver not found. Make sure your own configuration does not rely on that class. This can also happen if you are @ComponentScanning a springframework package (e.g. if you put a @ComponentScan in the default package by mistake)
    at org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClassParser.java:646) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassParser.lambda$processDeferredImportSelectors$2(ConfigurationClassParser.java:566) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    at java.util.ArrayList.forEach(Unknown Source) ~[na:1.8.0_162]
    at org.springframework.context.annotation.ConfigurationClassParser.processDeferredImportSelectors(ConfigurationClassParser.java:563) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:188) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:316) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:233) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:271) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:91) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:694) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:762) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:398) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:330) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1258) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
    at com.its.MicroservicesDashboardApplication.main(MicroservicesDashboardApplication.java:15) [classes/:na]
Caused by: java.lang.IllegalStateException: Could not evaluate condition on de.codecentric.boot.admin.config.SpringBootAdminClientAutoConfiguration due to org/springframework/boot/bind/RelaxedPropertyResolver not found. Make sure your own configuration does not rely on that class. This can also happen if you are @ComponentScanning a springframework package (e.g. if you put a @ComponentScan in the default package by mistake)
    at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:55) ~[spring-boot-autoconfigure-2.0.4.RELEASE.jar:2.0.4.RELEASE]
    at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:108) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:221) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClassParser.java:636) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
    ... 17 common frames omitted
Caused by: java.lang.NoClassDefFoundError: org/springframework/boot/bind/RelaxedPropertyResolver
    at de.codecentric.boot.admin.config.SpringBootAdminClientEnabledCondition.isEnabled(SpringBootAdminClientEnabledCondition.java:59) ~[spring-boot-admin-starter-client-1.3.3.jar:1.3.3]
    at de.codecentric.boot.admin.config.SpringBootAdminClientEnabledCondition.getMatchOutcome(SpringBootAdminClientEnabledCondition.java:45) ~[spring-boot-admin-starter-client-1.3.3.jar:1.3.3]
    at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:47) ~[spring-boot-autoconfigure-2.0.4.RELEASE.jar:2.0.4.RELEASE]
    ... 20 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.bind.RelaxedPropertyResolver
    at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_162]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_162]
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[na:1.8.0_162]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_162]
    ... 23 common frames omitted

MicroservicesDashboardApplication.java

@SpringBootApplication
@EnableDiscoveryClient
@EnableMicroservicesDashboardServer
public class MicroservicesDashboardApplication {

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

application.yml

spring:
  application:
    name: microservices-dashboard

server:
  port: 8083

pom.xml

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Finchley.SR1</spring-cloud.version>
    </properties>

    <dependencies>
        <!-- Actuator -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!-- Web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- Eureka Server -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>

        <!-- MS Dashboard Server -->
        <dependency>
            <groupId>be.ordina</groupId>
            <artifactId>microservices-dashboard-server</artifactId>
            <version>1.0.1</version>
        </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>

Answer 1

就像 Simon Martinelli 已经说过的，微服务仪表板与 Spring Boot 2 不兼容。我们已经意识到这个问题，并且已经对此进行了一些研究。

因为我们大多数人都不是在一家主要关注开源的公司工作，所以我们被迫在空闲时间从事这个项目。不幸的是，由于过去和最近发生的事件，这个项目没有得到它应得的工作/爱。然而，仍然我们打算继续这个项目的工作。