springBoot整合Eureka啟動失敗如何解決

其實springBoot 整合Eureka 是比較簡單，可是我發現很多人整合後會啟動不了，我這裡列出比較常見的報錯的原因

報：A child container failed during start

如圖下這樣

這個原因是因為pom.xml 沒有加入

<dependencymanagement>
        <dependencies>
            <dependency>
                <groupid>org.springframework.cloud</groupid>
                <artifactid>spring-cloud-dependencies</artifactid>
                <version>Finchley.SR1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencymanagement>

假如新增後依然報錯：

報錯原因是因為Springboot 與SpringCloud 版本不配對

##修改後就行正常運作了！最後把他們相對應的版本貼出來，可以看著相對應的springboot版本改springCloud

#Spring Boot Spring Cloud

1.2.x Angel版本
1.3.x Brixton版本
1.4.x stripes Camden版本
1.5.x Dalston版本、Edgware版本
2.0.x Finchley版本

SpringCloud異常(Euruka)

# Application run failed java.lang.NoSuchMethodError: org.springframework.boot.builder.SpringApplicationBuilder

在測試Euruka作為服務註冊中心的時候碰到了這個問題，錯誤提示如下：

#

"C:\Program Files\Java\jdk1.8.0_161\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</init>

其根本原因是依賴套件的版本衝突，我的這個pom.xml檔案如下：

<?xml  version="1.0" encoding="UTF-8"?>
<project>
    <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></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>
    </properties>
    <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.SR3</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>

這裡用到的SpringBoot版本為2.0.0.0版本，我們調整一下版本，改用下面的pom .xml

<?xml  version="1.0" encoding="UTF-8"?>
<project>
    <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>1.4.0.RELEASE</version>
        <relativepath></relativepath>
    </parent>
    <properties>
        <!--设置字符编码及java版本-->
        <project.build.sourceencoding>UTF-8</project.build.sourceencoding>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <!--增加eureka-server的依赖-->
        <dependency>
            <groupid>org.springframework.cloud</groupid>
            <artifactid>spring-cloud-starter-eureka-server</artifactid>
        </dependency>
        <!--用于测试的，本例可省略-->
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-test</artifactid>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <!--依赖管理，用于管理spring-cloud的依赖，其中Camden.SR3是版本号-->
    <dependencymanagement>
        <dependencies>
            <dependency>
                <groupid>org.springframework.cloud</groupid>
                <artifactid>spring-cloud-dependencies</artifactid>
                <version>Camden.SR3</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>

啟用正常。

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