简单搭建Eureka-Server注册中心，竟然告诉我Gson找不到

先放关键错误信息：

Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'gsonBuilder' defined in class path resource [org/springframework/boot/autoconfigure/gson/GsonAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.google.gson.GsonBuilder]: Factory method 'gsonBuilder' threw exception; nested exception is java.lang.BootstrapMethodError: java.lang.NoSuchMethodError: com.google.gson.GsonBuilder.setLenient()Lcom/google/gson/GsonBuilder;


An attempt was made to call the method com.google.gson.GsonBuilder.setLenient()Lcom/google/gson/GsonBuilder; but it does not exist. Its class, com.google.gson.GsonBuilder, is available from the following locations:

    jar:file:/E:/JAVA/greeApp/maven/repository/com/google/code/gson/gson/2.1/gson-2.1.jar!/com/google/gson/GsonBuilder.class

It was loaded from the following location:

    file:/E:/JAVA/greeApp/maven/repository/com/google/code/gson/gson/2.1/gson-2.1.jar

本来想简单启动一个eureka注册中心，所以只依赖了一个包spring-cloud-starter-netflix-eureka-server， 然后报的错也非常明显，Gson2.1包中有个setLenient方法找不到， 但是starter不是都自己集成好的依赖包，官方的还能报错。

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>org.example</groupId>
    <artifactId>spring-cloud-eureka-server</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
            <version>2.1.1.RELEASE</version>
        </dependency>
    </dependencies>

</project>


启动类：

@SpringBootApplication
@EnableEurekaServer
public class EurekaServer {

    public static void main(String[] args) {
        new SpringApplicationBuilder(EurekaServer.class)
                .web(WebApplicationType.SERVLET)
                .run(args);
    }
}

先写怎么解决的，排除Gson

@SpringBootApplication(exclude = {GsonAutoConfiguration.class})
@EnableEurekaServer
public class EurekaServer {

    public static void main(String[] args) {
        new SpringApplicationBuilder(EurekaServer.class)
                .web(WebApplicationType.SERVLET)
                .run(args);
    }
}

思考1：是不是版本太低了？

换上3.0.3最新版，还是报错。为什么，看不懂