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From: Steven Simpson <ss@domain.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: exec problem is JDK 1.7.0_21
Date: Mon, 22 Apr 2013 10:39:19 +0100
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Xref: csiph.com comp.lang.java.programmer:23566

On 22/04/13 07:36, Sven Köhler wrote:
> Am 22.04.2013 04:49, schrieb Knute Johnson:
>> On 4/21/2013 1:29 PM, Sven Köhler wrote:
>>> Am 21.04.2013 19:20, schrieb Knute Johnson:
>>>> One quoted argument "hello world"
>>> new ProcessBuilder("test.exe", "hello world");
>>> new ProcessBuilder("test.exe", "\"hello world\"");
>>> new ProcessBuilder("test.exe", "\"hello\" \"world\"");
>>>
>>> Run that on Windows as well as on something UNIX like - e.g. Linux.
> The output should have been:
>
> 1) argv[1]=hello world
> 2) argv[1]=hello world
> 3) argv[1]=hello
>     argv[2]=world
>
> And in the fourth example I added,

> new ProcessBuilder("test.exe", "\"\\\"hello world\\\"\"");

>   the output should have been
>
> 4) argv[1]="hello world"


I tested by cross-compiling a C program 'showargs' from Linux (with 
mingw32):

#include <stdio.h>

int main(int argc, char **argv)
{
   int i;
   printf("Arg count: %d\n", argc);
   for (i = 0; i < argc; i++)
     printf("  argv[%d]=[%s]\n", i, argv[i]);
   return 0;
}


To invoke from Java, I used:

import java.io.*;
import java.util.*;

public class TestProcessBuilder {
     public static void main(String[] args) throws Exception {
         test("showargs", "hello world");
         test("showargs", "\"hello world\"");
         test("showargs", "\"hello\" \"world\"");
         test("showargs", "\"\\\"hello world\\\"\"");
     }

     private static void test(String... args)
         throws IOException, InterruptedException {
         System.out.println("Java: " + Arrays.asList(args));
         ProcessBuilder pb = new ProcessBuilder(args);
         pb.redirectErrorStream(true);
         final Process proc = pb.start();
         Thread t = new Thread() {
             public void run() {
                 try (InputStream in = proc.getInputStream()) {
                     byte[] buf = new byte[1024];
                     int len;
                     while ((len = in.read(buf)) > -1) {
                         System.out.write(buf, 0, len);
                     }
                 } catch (IOException ex) {
                     System.err.println("error: " + ex);
                 }
             }
         };
         t.start();
         proc.getOutputStream().close();
         int rc = proc.waitFor();
         t.join();
     }
}

(I compiled this on Linux.)


On a Windows VM, I got this:

E:\>java -cp . TestProcessBuilder
Java: [showargs, hello world]
Arg count: 2
   argv[0]=[showargs]
   argv[1]=[hello world]
Java: [showargs, "hello world"]
Arg count: 2
   argv[0]=[showargs]
   argv[1]=[hello world]
Java: [showargs, "hello" "world"]
Arg count: 3
   argv[0]=[showargs]
   argv[1]=[hello]
   argv[2]=[world]
Java: [showargs, "\"hello world\""]
Arg count: 2
   argv[0]=[showargs]
   argv[1]=["hello world"]

E:\>

'java -version' reports:

java version "1.7.0_21"
Java(TM) SE Runtime Environment (build 1.7.0_21-b11)
Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode)



On Linux, I got this:

$ java -cp . TestProcessBuilder
Java: [showargs, hello world]
Arg count: 2
   argv[0]=[showargs]
   argv[1]=[hello world]
Java: [showargs, "hello world"]
Arg count: 2
   argv[0]=[showargs]
   argv[1]=["hello world"]
Java: [showargs, "hello" "world"]
Arg count: 2
   argv[0]=[showargs]
   argv[1]=["hello" "world"]
Java: [showargs, "\"hello world\""]
Arg count: 2
   argv[0]=[showargs]
   argv[1]=["\"hello world\""]
$

'java -version' report:

java version "1.7.0_15"
OpenJDK Runtime Environment (IcedTea7 2.3.7) (7u15-2.3.7-0ubuntu1~12.04.1)
OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)





-- 
ss at comp dot lancs dot ac dot uk