How can I call a C program in a Shell scipt from java

Hi all, I have a C program namely NetLibExample.c.I have compiled it to get a NetLibexample executable in RHEL5. It is successfully running from the terminal itself by the syntax: ./NetLibExample I have written a shell script to call the same.The shell script is cd /working/AVClient mkdir habib_test ./NetLibExample echo "1 image captured" This shell is running successfully and giving me the output( a new folder habib_test and output from the C program) I have to call the shell script from Java program.The program is like this. public class TestShell { public static void main(String[] args) { try{ System.out.println("I am here to test the shell correctly"); Runtime rt = Runtime.getRuntime(); Process proc = rt.exec("/working/"); int exitVal = proc.waitFor(); }catch(Exception e){ e.printStackTrace(); System.out.println("Exception caught.........."+e.toString()); } } } But when I am trying to call the shell from Java,shell is runnin g properly as I am getting the new folder created from the shell.The java program is giving a exception: java.lang.IllegalThreadStateException: process hasn't exited at java.lang.UNIXProcess.exitValue( at TestShell.main( Exception process hasn't exited Please help me.Thanks in advance.