idea error:java: 无效的源发行版: 8

1. 检查pom.xml

    <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-compiler-plugin</artifactId>
           <configuration>
               <source>1.8</source>
               <target>1.8</target>
               <encoding>utf8</encoding>
           </configuration>
    </plugin>
   

   可以发现，pom.xml中要求的是jdk8，出错的原因就是idea中配置的jdk版本不是8

2. 安装jdk1.8，过程略

3. 修改idea中的配置：file–>project structure 

4. file–>project structure 

5. file–>settings 

6. file–>settings 

7. file–>settings 

 <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
            <source>1.8</source>
            <target>1.8</target>
            <encoding>utf8</encoding>
        </configuration>
 </plugin>