Executing shell scripts within another shell script through Java code

In my Spring-boot application, I am trying to trigger a shell script which in turns internally executes several other shell scripts.I am able to trigger my main script (say master.sh) using ProcessBuilder, but thereon any scripts being called within master.sh do not run. In fact, nothing happens.

At a high-level, I am trying to do the following in my master.sh -

• Check for some condition
• Execute another shell script This never executes hence no further statements execute.
• make curl call back to my spring-boot app
  .....

Any help please...

Quick recap of the use case I was struggling with - In my spring-boot app, user has an option to trigger a main script (say master.sh) - this main script internally does the below -

(a). Executes another script present at some other location on the system :: this script could take anywhere between 30 mins - 3+ hours to execute.

(b). Once step (a) completes, master.sh (main script) runs curl commands to make a callback to my Spring boot application in order to perform updates to the DB.

Above steps a & b are executed multiple times inside the master.sh

Solution : As for triggering any command from Java code, i used ProcessBuilder to achieve the same. But I had to add below additional statements before issuing processBuilder.start() call in order to make it work -

processBuilder.redirectError(ProcessBuilder.Redirect.INHERIT);
processBuilder.redirectOutput(ProcessBuilder.Redirect.INHERIT);

Above statements redirect the script output to the parent process's (in this case Java) error and output streams.

At the moment it has worked for me. In case the behavior changes (which I don't anticipate) then I will update this thread accordingly.

Lastly, I would request others to share their understanding on why without the above two statements my internal scripts did not run. I do understand the "why" but not finding a clear wording to explain. Thanks All.