Java compiler level does not match solution

1,

Set up the JDK first, need to determine the project, Eclipse/myeclipse, the system is using the same version of the JDK, my system installed JDK is 1.7, so I put eclipse jdk into 1.7

2,

Enter Windows---proferences---java--compiler settings compiled files using the format is 1.7 version (set to how many lines, as long as compatible, and with your project compiled version always can, I here unified set to 1.7)

3,

Enter Project--properties---java Compiler to set the project compilation version to 1.7

4,

Enter Project--properties---myeclipse---project facets set Java file version to 1.7

Java compiler level does not match solution