SpringCloud版本问题

兴致勃勃地跟随文档创建并配置Eureka Server工程后，启动准备测试，发现报了java.lang.NoSuchMethodError: org.springframework.boot.builder.SpringApplicationBuilder导致启动失败，下面就来分析下原因：

一、问题：

SpringBoot工程在配置Eureka Server后启动报错：

12:37:49.426 [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:157)
    at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:98)
    at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:64)
    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:75)
    at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54)
    at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:347)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:306)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
    at com.zrk.eurekaserver.EurekaServerApplication.main(EurekaServerApplication.java:12)

二、原因

原因是SpringCloud与SpringBoot版本兼容问题

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.zrk</groupId>
    <artifactId>eureka-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>eureka-server</name>
    <description>Eureka Server</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <!-- 使用dependencyManagement进行版本管理 -->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Dalston.SR5</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>

    </dependencyManagement>

用的SpringCloud版本为Dalston.SR5,SpringBoot版本为2.1.3.RELEASE，而参考官方文档SpringCloud发布版本对应的SpringBoot兼容版本如下：

Table 1. Release train Spring Boot compatibility

Release Train	Boot Version
Greenwich	2.1.x
Finchley	2.0.x
Edgware	1.5.x
Dalston	1.5.x

三、解决

将SpringBoot版本调整为1.5.6.RELEASE再启动就没有问题了

四、相关参考

SpringCloud官方文档：https://spring.io/projects/spring-cloud

SpringCloud版本：https://blog.csdn.net/i_hanjt/article/details/81947366