Java executes bash scripts that run daemon scripts

I'm processing a bash script that runs when my java server application requests a server restart The actions performed by this script need to be outside the process tree of the Java application

I use processbuilder to call the restart script in Java in the following ways:

// Vars declared at the top of the file
private static final String LOC = "/some/directory/";
private static final String RESTART_SCRIPT = LOC + "restart.sh";
...
// In the function that is invoked to handle reboot behavior
final ProcessBuilder pb = new ProcessBuilder(RESTART_SCRIPT);
Process p = pb.start();

This script does the following to deaminize another script that handles all restart logic It looks like this:

#!/bin/bash
(bash /some/directory/shutdownHandler.sh "true" &)
exit 0

When I called functions containing ProcessBuilder logic in Java Application, I was not in shutdownHandler.. See the impact of logic in the SH script Even simple text - to - file echoes do not occur I've checked that I have the right permissions

When I execute restart directly from the command line SH, it works as expected

Please tell me why I see this difference in behavior Does java have scripts that kill daemons?

Solution

I suggest you try the following simplification:

final String[] RESTART_COMMAND = { "nohup","/some/directory/shutdownHandler.sh","true" };
final ProcessBuilder pb = new ProcessBuilder(RESTART_COMMAND);
Process p = pb.start();
//DON'T waitFor()

Using nohup and avoiding waitfor should have restart_ Script achieves the same effect: the life cycles of the two processes are independent (the JVM does not wait for shutdownhandler.sh, and the termination of Java processes will not cause the interruption of shutdownhandler. SH)