spring-cloud搭建踩坑--eureka

spring-cloud搭建-eureka

1、搭建過程中遇到java.lang.NoSuchMethodError: com.google.gson.GsonBuilder.setLenient()Lcom/google/gson/GsonBuilder;

    最後定位是由于直接使用spring-cloud的Finchley.RELEASE作為版本，這裡預設使用的是spring-boot的2.0.3，會出現此問題，手動指定spring-boot的版本，即加入以下内容後，不會出現GsonBuilder錯誤。（詳細原因未深究，歡迎各位大神評論中支援，謝謝）

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.3.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>
           

2、添加後，再次啟動spring-boot工程，會出現com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused: connect錯誤，這裡是由于eureka預設會把自己也注冊到自己 Eureka Server上，并且擷取 Eureka Server上的注冊資訊，是以在配置裡添加如下内容

eureka:
    client:
        #表示是否将自己注冊到Eureka Server上，預設為true
        registerWithEureka: false
        #表示是否從Eureka Server上擷取注冊資訊，預設為true
        fetchRegistry: false
        serviceUrl:
            defaultZone: http://localhost:8761
           

3、打開浏覽器後，輸入 http://localhost:8761/，即可通路到eureka監控頁面。

工程所有配置和類檔案如下：

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.eurekatest</groupId>
  <artifactId>springeureka</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>springeureka Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <!-- 這裡如果不指定spring-boot的版本，則會出現初始化Google的GsonBuilder錯誤-->
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.3.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
    <!-- 版本号一定要指定，不同的版本需要的依賴不同   Greenwich.M1 -->
    <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter</artifactId>
    </dependency>

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


  <build>
    <finalName>springeureka</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-maven-plugin</artifactId>
          <!-- 沒有該配置，devtools 不生效 -->
          <configuration>
            <mainClass></mainClass>
            <fork>true</fork>
          </configuration>
        </plugin>

      </plugins>
    </pluginManagement>
  </build>
</project>
           

application.yml

spring:
  application:
    name: spring-cloud-eureka-server
server:
  port: 8761
eureka:
  client:
    #表示是否将自己注冊到Eureka Server上，預設為true
    registerWithEureka: false
    #表示是否從Eureka Server上擷取注冊資訊，預設為true
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://localhost:8761
           

EurekaApplication.java
           

package com.test.register.center;

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);
    }

}