Run a Python Script from Java [duplicate]

Question

I want to run a Python2 Script from my Java application but it doesn't run.

I don't get any Stack or Error - It just does not run!

I tried this:

public void execPython2(String file, String parm0) {
    try {
        Process p = new ProcessBuilder("python2", file, parm0).start();
    } catch (Exception e) {
    }
}

Here is the method call:

public String getMAC(String IP_Addr) {
    execPython2("getMacAddr.py", IP_Addr);    
    try {
        Thread.sleep(500);
    } catch (Exception e) {
    }

    String macAddr[] = readFromFile("lastMac.log", false);    
    try {
        Thread.sleep(500);
    } catch (Exception e) {
    }

    return macAddr[0];
}

The python2 script will create a "lastMac.log" file.

At first I thought the python script would not be finished and I just have to wait until it is finished but i guess the Python script is not even running.

Regarding I don't get any Stack or Error, you need to add e.printStackTrace(); in all the catch blocks so if there are any exceptions then it would print stack trace on console. — JRG
– JRG, Commented Aug 1, 2017 at 9:28

GhostCat · Accepted Answer · 2017-08-01 09:26:56Z

4

Python is a script language - it needs an interpreter to be executed.

So, to be on the safe side - build a comment like

 full-path-to-binary/python full-path-to-your-script/yourscript.py

When you are using a unix-like Operating System and when you are writing your script to contain a correct #!/path/to/python statement in its first line, and when the script has r+x file system permissions you might not need to do so.

The next step then: your code is ignoring any exception. Consider checking error messages instead of ignoring them.

edited Aug 1, 2017 at 9:26

answered Aug 1, 2017 at 9:25

GhostCat

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4 Comments

MrFlyingToasterman Over a year ago

I know that :) The path is 150% correct.

GhostCat Over a year ago

How do you know - your code throws away any exceptions coming from there?!

MrFlyingToasterman Over a year ago

Because i only got one Folder^^ Everything is in there. But the Problem was i copyed some files from one dir to another. It seems like the x attrib was lost. I reset the ugo+x and now its running! Thank you :)

davidxxx Over a year ago

"150% correct" Whou :)

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