Java extension compilation error

J2EE Compilation.

 

javac: invalid flag: -buildfile

Usage: javac <options> <source files>

use -help for a list of possible options

I have written few .net extension and it was very smooth. I don't understand what to fix as the code works in eclipse. Does eveyone know the solution for this?

I am using jdk1.8.0_25 and intergration studio 9.0.0.19. 

Thanks
Pravin