How to run a .sh file from Java? [duplicate]

Question

I need to run a .sh file from my Java code with out passing any arguments. I already tried doing it with

Runtime.getRuntime().exec("src/lexparser.sh");

and

ProcessBuilder pb = new ProcessBuilder("src/lexparser.sh");
Process p = pb.start();

Both of the above methods didn't work. Is there any other method to run a .sh file form Java?

Answer 1

ProcessBuilder pb = new ProcessBuilder("src/lexparser.sh", "myArg1", "myArg2");
 Process p = pb.start();
 BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
 String line = null;
 while ((line = reader.readLine()) != null)
 {
    System.out.println(line);
 }

Answer 2

There are two things that are easy to miss:

1. Path and CWD. The simplest way to ensure that the executable is found is to provide the absolute path to it, for example /usr/local/bin/lexparser.sh

2. Process output. You need to read the process output. The output is buffered and if the output buffer gets full the spawned process will hang.