Java process.getRuntime().exec() 从不停止他的工作

Question

Hello guys im writing a web app in java with servlet, but i need for a job to use python, so im using Process.getRuntime().exec() for call the script. My web app is a survey and between client compile it we take a photo of him. I need python for deepface, for detection his emotion, and write all the results in a pdf file (what he choose, photos and detection of emotion result). For 7 question in the survey the script works fine, when i put 8 question he never stop his job (the script working when isn't called from java i tested it). Can you help me for understand how i can find the error? This process has got a limit of resources or something like that?

Process p = Runtime.getRuntime().exec("python "+rootPath+"\\DeepFaceLearning\\TestFace.py "+nomeFile);
        
        BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));
        String temp ="";
        while((temp = stdInput.readLine()) != null) {
                System.out.println(temp);

            }

For python the script is very long, but i think the problem is java beacuse he works fine when i run the script from command line with 40 questions. I need to add 21 question in total. Script python:

1. take a file read it and save the questions,reason e photos in a variables
2. analyze all photos
3. wirte all this information on a pdf
4. save pdf in db

Edit: java enter into script but don't complete all the job.

Answer 1

If the your python is working for 7 the same way as for 8 question, you could try to read the inputstream in other Thread .

Like:

   ...
    new Thread(new Runnable(){

@Override
public void run(){
          BufferedReader stdInput = new BufferedReader(newInputStreamReader(p.getInputStream()));
          String temp ="";
          while((temp = stdInput.readLine()) != null) {
               System.out.println(temp);
    }}).start();