Using Runtime.getRuntime().exec() to run perl code in java

Question

I have a perl script called pbp that takes an html file as an argument and then creates an output file. Here is my current code. Infile is obtained earlier from a JFile Chooser. I don't get any errors but there is no ouput from the perl script.

try {
            Process p = Runtime.getRuntime().exec(new String[] {"perl", "C:\\Users\\Roger\\Downloads\\The_Long-Awaited_Product_Specification_and_Sample_Files\\casey\\pbp", inFile.getAbsolutePath()});
            p.getInputStream().close();
            p.getOutputStream().close();
            p.getErrorStream().close();
            System.out.println(p.waitFor());
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } catch (InterruptedException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }

And perl is doing fine from command line? – mpapec May 25 '13 at 16:33 — mpapec, May 25 '13 at 16:33
Can you show the relevant parts of the perl script? – Steve P. May 25 '13 at 16:54 — Steve P., May 25 '13 at 16:54
The perl works correctly from the command line. – user2420694 May 25 '13 at 17:32 — user2420694, May 25 '13 at 17:32

score 0 · Accepted Answer · answered May 25 '13 at 16:55

You will not get the output of per script directly. You need to capture it using the below code:

BufferedReader stdInput = new BufferedReader(new 
     InputStreamReader(p.getInputStream()));


// read the output from the command
System.out.println("EXE OUTPUT");
while ((s = stdInput.readLine()) != null) {
    System.out.println(s);
}

Using Runtime.getRuntime().exec() to run perl code in java

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