Maven project problem, jdk version is lower

1. Find maven in preference

2. Find out

3.

<profile>    
      <id>jdk-1.7</id>    
       <activation>    
        <activeByDefault>true</activeByDefault>    
        <jdk>1.7</jdk>    
      </activation>    
    <properties>    
    <maven.compiler.source>1.7</maven.compiler.source>    
    <maven.compiler.target>1.7</maven.compiler.target>    
   <maven.compiler.compilerVersion>1.7</maven.compiler.compilerVersion>    
   </properties>    
   </profile>

4.clean update maven