Trying to execute a Java jar with Runtime.getRuntime().exec()

Question

In the project I am working on, I need to execute a script that I have in a resources folder -- in the class path. I am simply testing the final script functionality, since

Answer 1

Use the Process instance returned by exec()

Process cat = Runtime.getRuntime().exec("java -jar C:/cat.jar C:/test.txt");
BufferedInputStream catOutput= new BufferedInputStream(cat.getInputStream());
int read = 0;
byte[] output = new byte[1024];
while ((read = catOutput.read(output)) != -1) {
    System.out.println(output[read]);
}

References:
http://docs.oracle.com/javase/7/docs/api/java/lang/Process.html

By default, the created subprocess does not have its own terminal or console. All its standard I/O (stdin, stdout, stderr) operations will be redirected to the parent process, where they can be accessed via the streams obtained using the methods getOutputStream(), getInputStream(), and getErrorStream().

http://docs.oracle.com/javase/7/docs/api/java/lang/Process.html#getInputStream()

getInputStream() returns the input stream connected to the normal output of the subprocess.