Error in calling Python file from Java code and getting the result

I have to use results from python executed code in Java. I have downloaded jython jars. I fetch below part of code from Internet. But the errorreflected is python: can't open file 'IBM.py': [Errno 2] No such file or directory. Where does it searches for the file ? My file is created in pycharm projects.

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class CallPython {

    /**
 * @param args
 * @throws IOException 
 */
public static void main(String[] args) throws IOException {
     String s = null;
    // TODO Auto-generated method stub
    Process p = Runtime.getRuntime().exec("python IBM.py");
    System.out.println("ayush");
     BufferedReader stdInput = new BufferedReader(new 
             InputStreamReader(p.getInputStream()));

        BufferedReader stdError = new BufferedReader(new 
             InputStreamReader(p.getErrorStream()));

        // read the output from the command
        System.out.println("Here is the standard output of the command:\n");
        while ((s = stdInput.readLine()) != null) {
            System.out.println(s);
        }

        // read any errors from the attempted command
        System.out.println("Here is the standard error of the command (if any):\n");
        while ((s = stdError.readLine()) != null) {
            System.out.println(s);
        }
}}