i try to tansplant the wirless_tools to Android4.0 system, but i hava some problem with java

i try to tansplant the wirless_tools to Android4.0 system, but i hava some problem with java

my Linux system is UbuntuKylin, well, a new branch mainly spreading in China. i have changed some files,such as wireless.22.h,ifrename.c and iwlib.h in wireless_tools.29/ which is located in Android4.0 root directory. then i followed the steps:
$ cd ~/Android4.0
$ su
$[key](change to root)
root# source build/envsetup.sh
root# cd ~/Android4.0/wireless_tools.2.9/
root# mm
well,telling me that
Your version is: java version "1.7.0_21".
The correct version is: Java SE 1.6.
ok,then i did as How can I uninstall my current java and install sun java 1.6 the java was installed successfully. but when i tried mm again:
Your version is: java version "1.6.0_27".
The correct version is: Java SE 1.6.
then i tried https://source.android.com/source/initializing.html but in vain.
how can i install the "java SE 1.6." correctly? thanks.