code: package gr.iti.mklab;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStreamReader;
  
  public class JavaRunCommandPython {
  
  	 public static String execute(String pythonScript, String postText) {
  
  	        String s = null;
  	        String output_vector = "";
  	        try {	            
  	            // using the Runtime exec method:
  	            Process p = Runtime.getRuntime().exec("python " + pythonScript + " " + postText);
  	            System.out.println("   -- Python cmd  " + pythonScript + " " + postText);
  	            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) {
  	            	 output_vector = s;
  	            	 System.out.println(s);
  	            }            
  	            // read any errors from the attempted command
  	            while ((s = stdError.readLine()) != null) {
  	                System.out.println(s);
  	            }	            
  	        }
  	        catch (IOException e) {
  	            System.out.println("exception happened - here's what I know: ");
  	            e.printStackTrace();
  	           // System.exit(-1);
  	        }
  	        return output_vector;
  	    }
  }
  