daemonize java program - go background after input some data

Question

I tried to find a solution for the following use case (on Linux):

1. Start the program, show some information to the stdout, input some information such as username/password.
2. The program validate the username/password, then goes to background and run as a daemon.

I did not find a way to do this in Java. There are several sulotions to daemonize java program (such as jsvc, or this: http://barelyenough.org/blog/2005/03/java-daemon/ ). But seems they all do not work for this situation, because the program just goes to background from the beginning, there is no chance to input information before it goes to background.

Answer 1

I don't believe that there's a way to do this purely in java. You could make it work by writing an init script which accepted the command line parameters before spawning the java process in the background. You could use -D command line arguments to pass the user input to the java process.