Shell script with automator

I borrowed the code for a hidden password prompt from here. See if the following Run AppleScript action works for you in an Automator application. I don't have Java installed to further test.

set my_password to display dialog"Please enter your sudo password:" with title ¬

"Password" with icon caution default answer"" buttons {"Cancel", "OK"} default button 2 ¬

giving up after 60 with hidden answer

if length of (text returned of my_password) is not 0 then

display dialog "Running the application!" buttons ["OK"] default button 1

do shell script "sudo /usr/bin/java -cp /Applications/html2pop3/html2pop3.jar htmlgui " & "\" & my_password & \""

else

display dialog "You didn't enter a sudo password!" buttons ["OK"] default button 1

end if

Have a look at the following article and see if that helps.

Apple script with Bash SU Authentication ( Automator) - Stack Overflow