Re: exec problem is JDK 1.7.0_21

On 22/04/13 07:36, Sven K?hler wrote:


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)