最近学习spring cloud,在测试Eureka作为服务注册中心的时候碰到了问题，错误提示如下：

"D:\Program\Java\JDK1.8\bin\java" -XX:TieredStopAtLevel=1 -........ com.fangxing.springcloud.eurukaserver.EurukaServerApplication

15:04:35.690 [main] DEBUG org.springframework.boot.context.logging.ClasspathLoggingApplicationListener - Application failed to start with classpath: ....... file:/D:/Program%20Files/JetBrains/IntelliJ%20IDEA%202017.3.5/lib/idea_rt.jar]

15:04:35.867 [background-preinit] DEBUG org.jboss.logging - Logging Provider: org.jboss.logging.Log4j2LoggerProvider

15:04:35.869 [background-preinit] INFO org.hibernate.validator.internal.util.Version - HV000001: Hibernate Validator 6.0.7.Final

15:04:35.884 [background-preinit] DEBUG org.hibernate.validator.internal.engine.resolver.TraversableResolvers - Cannot find javax.persistence.Persistence on classpath. Assuming non JPA 2 environment. All properties will per default be traversable.

15:04:35.890 [background-preinit] DEBUG org.hibernate.validator.internal.xml.ValidationXmlParser - Trying to load META-INF/validation.xml for XML based Validator configuration.

15:04:35.892 [background-preinit] DEBUG org.hibernate.validator.internal.xml.ResourceLoaderHelper - Trying to load META-INF/validation.xml via TCCL

15:04:35.893 [background-preinit] DEBUG org.hibernate.validator.internal.xml.ResourceLoaderHelper - Trying to load META-INF/validation.xml via Hibernate Validator's class loader

15:04:35.894 [background-preinit] DEBUG org.hibernate.validator.internal.xml.ValidationXmlParser - No META-INF/validation.xml found. Using annotation based configuration only.

15:04:36.086 [background-preinit] DEBUG org.hibernate.validator.messageinterpolation.ResourceBundleMessageInterpolator - Loaded expression factory via original TCCL

15:04:36.090 [background-preinit] DEBUG org.hibernate.validator.internal.engine.ValidatorFactoryImpl - HV000234: Using org.hibernate.validator.messageinterpolation.ResourceBundleMessageInterpolator as ValidatorFactory-scoped message interpolator.

15:04:36.090 [background-preinit] DEBUG org.hibernate.validator.internal.engine.ValidatorFactoryImpl - HV000234: Using org.hibernate.validator.internal.engine.resolver.TraverseAllTraversableResolver as ValidatorFactory-scoped traversable resolver.

15:04:36.090 [background-preinit] DEBUG org.hibernate.validator.internal.engine.ValidatorFactoryImpl - HV000234: Using org.hibernate.validator.internal.util.ExecutableParameterNameProvider as ValidatorFactory-scoped parameter name provider.

15:04:36.090 [background-preinit] DEBUG org.hibernate.validator.internal.engine.ValidatorFactoryImpl - HV000234: Using org.hibernate.validator.internal.engine.DefaultClockProvider as ValidatorFactory-scoped clock provider.

15:04:36.090 [background-preinit] DEBUG org.hibernate.validator.internal.engine.ValidatorFactoryImpl - HV000234: Using org.hibernate.validator.internal.engine.scripting.DefaultScriptEvaluatorFactory as ValidatorFactory-scoped script evaluator factory.

15:04:36.404 [main] ERROR org.springframework.boot.SpringApplication - Application run failed

java.lang.NoSuchMethodError: org.springframework.boot.builder.SpringApplicationBuilder.<init>([Ljava/lang/Object;)V

    at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext(BootstrapApplicationListener.java:120)

    at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:84)

    at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:62)

    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)

    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)

    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)

    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127)

    at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:74)

    at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54)

    at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:351)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:317)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1234)

    at com.fangxing.springcloud.eurukaserver.EurukaServerApplication.main(EurukaServerApplication.java:16)

Process finished with exit code 1

在网上一顿查，最终发现问题： 其根本原因是依赖包的版本冲突，我的pom.xml文件如下：

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.fangxing.springcloud</groupId>

    <artifactId>euruka-server</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>jar</packaging>

    <name>euruka-server</name>

    <description>Demo project for Eureka Server</description>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.0.0.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframewor k.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-eureka-server</artifactId>

        </dependency>

    </dependencies>

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.springframework.cloud</groupId>

                <artifactId>spring-cloud-dependencies</artifactId>

                <version>Camden.SR4</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>

可以看到，我用的spring boot 版本为2.0,Spring cloud的版本为Camden.SR4，我们调整一下Spring boot的版本，改用下面的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 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.fangxing.springcloud</groupId>

    <artifactId>euruka-server</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>jar</packaging>

    <name>euruka-server</name>

    <description>Demo project for Eureka Server</description>

    <!--基于Springboot-->

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>1.5.6.RELEASE</version>

        <relativePath/>

    </parent>

    <dependencies>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-eureka-server</artifactId>

        </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>Camden.SR4</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>

启用服务，正常。

下面是我整理的Cloud和Boot版本对应关系

  从表中我们不难看出，最新的F版，完美支持spring boot 2.x,并建议不使用1.5.x及以前版本。
    关于Spring Boot 2 中值得关注的新特性可以查看这篇文章：https://www.oschina.net/news/93772/spring-boot-2-0-released-not-yet。
  关于Spring cloud Finchley 最新特性可以查看该文 https://spring.io/blog/2018/06/19/spring-cloud-finchley-release-is-available。

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