Spring Cloud之Eureka

使用Spring Cloud搭建微服务时,往往用到Eureka作为服务发现。

第一次搭建的时候很容易报错:

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2016-11-21 22:34:02.315 ERROR 20635 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

Parameter 0 of method traceFilterRegistration in org.springframework.cloud.netflix.eureka.server.EurekaServerConfiguration required a bean of type 'javax.servlet.Filter' that could not be found.
- Bean method 'resourceUrlEncodingFilter' in 'FreeMarkerAutoConfiguration.FreeMarkerWebConfiguration' not loaded because @ConditionalOnEnabledResourceChain did not find class org.webjars.WebJarAssetLocator


Action:

Consider revisiting the conditions above or defining a bean of type 'javax.servlet.Filter' in your configuration.

网上有一种解决方案就是删掉.m2仓库,然后重新下载依赖,这样有一些坏处。

另外一种原因可能就是spring-boot-starter-parent版本问题,使用1.5.6.RELEASE版本时可以的。

项目pom.xml

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<?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>xyz.asurily</groupId>
<artifactId>spring-boot-cloud</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.6.RELEASE</version>
<relativePath/>
</parent>

<modules>
<module>eureka-server</module>
</modules>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
<docker.plugin.version>1.0.0</docker.plugin.version>
<docker.image.prefix>spring-boot-cloud</docker.image.prefix>
<spring.cloud.version>Dalston.SR4</spring.cloud.version>
<spring-boot-admin.version>1.5.4</spring-boot-admin.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<dependencyManagement>
<dependencies>
<dependency>
<groupId>de.codecentric</groupId>
<artifactId>spring-boot-admin-server</artifactId>
<version>${spring-boot-admin.version}</version>
</dependency>
<dependency>
<groupId>de.codecentric</groupId>
<artifactId>spring-boot-admin-server-ui</artifactId>
<version>${spring-boot-admin.version}</version>
</dependency>
<dependency>
<groupId>de.codecentric</groupId>
<artifactId>spring-boot-admin-server-ui-hystrix</artifactId>
<version>${spring-boot-admin.version}</version>
</dependency>
<dependency>
<groupId>de.codecentric</groupId>
<artifactId>spring-boot-admin-server-ui-turbine</artifactId>
<version>${spring-boot-admin.version}</version>
</dependency>
<dependency>
<groupId>de.codecentric</groupId>
<artifactId>spring-boot-admin-server-ui-login</artifactId>
<version>${spring-boot-admin.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring.cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>

<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>com.spotify</groupId>
<artifactId>docker-maven-plugin</artifactId>
<version>${docker.plugin.version}</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>build</goal>
</goals>
</execution>
</executions>
<configuration>
<imageName>${docker.image.prefix}/${project.artifactId}</imageName>
<dockerDirectory>${project.basedir}/</dockerDirectory>
<resources>
<resource>
<targetPath>/</targetPath>
<directory>${project.build.directory}</directory>
<include>${project.build.finalName}.jar</include>
</resource>
</resources>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>

eureka服务pom

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<?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">
<parent>
<artifactId>spring-boot-cloud</artifactId>
<groupId>xyz.asurily</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

<artifactId>eureka-server</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>${project.artifactId}</name>

<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-security</artifactId>
</dependency>
</dependencies>

<build>
<finalName>${project.artifactId}</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>com.spotify</groupId>
<artifactId>docker-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

模块bootstrap.yml

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spring:
application:
name: eureka

模块application.yml

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server:
port: 9090
eureka:
instance:
hostname: eureka
prefer-ip-address: true
client:
register-with-eureka: false
fetchRegistry: false
service-url:
defaultZone: http://${security.user.name}:${security.user.password}@${eureka.instance.hostname}:${server.port}/eureka/
security:
user:
name: user
password: test

主类

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package xyz.asurily.eureka;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class EurekaApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaApplication.class, args);
}
}

得到结果eureka