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How to check if the process is running on Linux in Java

In this article, we will learn how to check whether a specific process is running on Linux in Java. There is a case where we have to check before executing the tasks whether a specific process is currently running or not. 



    private boolean isProcessAlreadyRunning() throws IOException{
        String line;

        String applicationToCheck = "mytask.jar";
        boolean applicationIsRunning = false;


        Process proc = Runtime.getRuntime().exec("ps -ef");
        InputStream stream = proc.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(stream));

        //Parsing the input stream.
        while ((line = reader.readLine()) != null) {
            Pattern pattern = Pattern.compile(applicationToCheck);
            Matcher matcher = pattern.matcher(line);
            if (matcher.find()) {
                log.info(line);
                applicationIsRunning = true;
                break;
            }
        }
        return applicationIsRunning;
    }