引发Java错误时停止AppleScript运行.jar

Question

I have an AppleScript which I am using to run a .jar file. The .jar file takes several inputs which were originally entered via the command line but now I enter into a .csv and get read into the .jar automatically. For unknown reasons, sometimes a number in the CSV is not read correctly leading to a NumberFormatException in the Java code. However, instead of breaking, my script continually tries to enter the invalid input in an infinite loop. Is there a way to amend my code so that when an error is raised by the .jar, the script stops?

Here is my current code:

on RunFile(jar_location)
    do shell script "cd " & jar_location & " ; cat 'prompt.csv' | sh 'runScript.sh' 'WSO'"
end RunFile

Answer 1

After going over this in the comments, it's clear that the problem is that the .jar file is trying to be interactive — asking for some input at the cursor — and AppleScript's do shell script is not designed for that. AppleScript can get errors and outputs form the shell, but it cannot feed a response back to the shell, or tell if a shell script is waiting for input.

if the .jar file cannot be operated in a non-interactive mode, then the only for AppleScript to make sure the process ends is to grab its process id number, wait a reasonable amount of time, and then send it a kill signal. That script would look like this:

on RunFile(jar_location)
    set pid to do shell script "cd " & jar_location & " ; cat 'prompt.csv' | sh 'runScript.sh' 'WSO' &> /dev/null & echo $!"
    -- wait 5 seconds, or whatever seems appropriate for the task to complete
    delay 5
    try
        do shell script "kill " & pid
    end try
end RunFile

The appended &> /dev/null & echo $! phrase detaches the shell script, allowing the AppleScript to move forward, and returns the process id of the process for later use. I've put the kill signal in a try block so that the script does not throw an error if the process has already exited normally.