Hello:
boot.properties can be RECREATED...
Only one condition exists. You must know the userid and password for the domain startup.
Remember when you used to bring up the console using system as userid and password as the password? The same values are needed here.
So when you created/modified the domain password, if you did not save it somewhere safe, you are out of luck.
If you do have these values follow the lines below:
Navigate to $PS_HOME/webserv/<domain_name>/servers/PIA/security
copy the eixsting boot.properties to boot.properties.orig
vi the file and replace the encrypted values for userid: and password: with the values you have.
Bring up the domain.
tail -f the PIA_weblogic log to ascertain that it worked.
Cheers!!!