Java : Spring : Source option 6 is no longer supported. Use 7 or later

Today i just tried to build my first web Java application. I follow the instructions from this link: https://docs.spring.io/spring-boot/docs/1.0.2.RELEASE/reference/html/getting-started-first-application.html

Everything looks good until i reach to step 10.4 ,  i got this error

[ERROR] Source option 6 is no longer supported. Use 7 or later.
[ERROR] Target option 6 is no longer supported. Use 7 or later.

Some recommend that we need to add this in to tag

    1.8
    1.8

It works for some people , but it’s not working for me. Finally i found that i need to add this

    1.9

More detail is from this url: https://www.baeldung.com/maven-java-version

This is my final pom.xml

    4.0.0

    com.example
    myproject
    0.0.1-SNAPSHOT

    
        org.springframework.boot
        spring-boot-starter-parent
        1.0.2.RELEASE
    

    


    1.9


    
    
        org.springframework.boot
        spring-boot-starter-web
    



    
        
            org.springframework.boot
            spring-boot-maven-plugin