Spring boot 启动报错 Unsupported major.minor version 52.0

Spring boot 启动报错 Unsupported major.minor version 52.0

• 问题描述
  在创建spring boot hello world 工程时候启动报错， Unsupported major.minor version 52.0。

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/yf/springboot/Application : Unsupported major.minor version 52.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)

• 工程描述
  pom文件如下：

<?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.yf.springboot</groupId>  
<artifactId>spring-boot-hello</artifactId>  
<version>0.0.1-SNAPSHOT</version>  
<!-- Inherit defaults from Spring Boot -->  
<parent>  
<groupId>org.springframework.boot</groupId>  
<artifactId>spring-boot-starter-parent</artifactId>  
<!-- <version>1.4.0.BUILD-SNAPSHOT</version> -->
<version>1.4.1.RELEASE</version>
</parent>  
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java-version>1.7</java-version>
</properties>

<!-- Add typical dependencies for a web application -->  
<dependencies>  

<dependency>  
<groupId>org.springframework.boot</groupId>  
<artifactId>spring-boot-starter-web</artifactId>  
<!-- 不需要version 会根据parent版本进行添加上-->
</dependency> 
<!-- 添加fastjson -->
<dependency>  
<groupId>com.alibaba</groupId>  
<artifactId>fastjson</artifactId>  
<version>1.2.15</version>
</dependency> 

</dependencies>  

<!-- Package as an executable jar -->  
<build>  

<!-- 
 <plugins> 
 <plugin> 
 <groupId>org.springframework.boot</groupId> 
 <artifactId>spring-boot-maven-plugin</artifactId> 
 </plugin> 
 </plugins> 
 -->  
<!-- 在这里添加springLoader plugin 实现热拔插开发 1、spring-boot:run
 2、run as -java application
 run-config vm -javaagent:.\lib\springloaded-1.2.3.RELEASE.jar -noverify
 -->
<plugins>
<plugin>  
<groupId>org.springframework.boot</groupId>  
<artifactId>spring-boot-maven-plugin</artifactId>  
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>springloaded</artifactId>
<version>1.2.3.RELEASE</version>
</dependency>
</dependencies>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>

</executions>
<configuration>
<classifier>exec</classifier>
</configuration>
</plugin>  
</plugins>  
</build>  

<!-- Add Spring repositories -->  
<!-- (you don't need this if you are using a .RELEASE version) -->  
<!-- <repositories> 
 <repository> 
 <id>spring-snapshots</id> 
 <url>http://repo.spring.io/snapshot</url> 
 <snapshots><enabled>true</enabled></snapshots> 
 </repository> 
 <repository> 
 <id>spring-milestones</id> 
 <url>http://repo.spring.io/milestone</url> 
 </repository> 
 </repositories> 
 <pluginRepositories> 
 <pluginRepository> 
 <id>spring-snapshots</id> 
 <url>http://repo.spring.io/snapshot</url> 
 </pluginRepository> 
 <pluginRepository> 
 <id>spring-milestones</id> 
 <url>http://repo.spring.io/milestone</url> 
 </pluginRepository> 
 </pluginRepositories> -->
</project>  

最后根据报错描述，和网上了解，出错是因为Spring boot 版本的许多jar包 依赖JDK1.8，所以启动时候会报错，类似不支持jdk版本的提示。只要换上JDK8 环境就可以啦。

因为本人Eclipse 是最新版本的依赖jdk1.8，所以不需要安装jdk8。所以再eclipse更还jre换班即可。
更换操作如下：
1、build path

2、add library

3、select jdk version

4、maven update - 重新编译项目

经过上诉步骤操作，成功启动spring boot hello world 程序。