Error : "Dynamic Web Module 3.1 requires Java 1.7 or newer"

os:win8.1
ide:myeclipse 2014
maven:embedded 3.0.4

i use "javaee7-essentials-archetype" to create a default j2ee7 project use most default value. After than,it show "Dynamic Web Module 3.1 requires Java 1.7 or newer" error and the project jre lib is j2se 1.4 .  even if i change it to 1.7,the error also , and in the project facets , there is no item checked,can you slove it?
