GO TO THIS LOCATION

D:\Oracle\Middleware\user_projects\domains\ClassicDomain\servers\AdminServer\security

CREATE TEXT FILE

ENTER USERNAME AND PASSWORD

SAVE AS file name boot.properites.(NOTE: do not forget to set type of file as all file)

You can set auto password for form and report services also to start service password less using batch file.

Copy boot.properties file to security of FORM SERVER AND REPORT SERVER IF YOUR USERNAME AND PASSWORD IS SAME AS ADMIN SERVER

See Tutorial Video here to set password