Name: dk106046			Date: 08/19/2004

OPERATING SYSTEM(S):
LinuxIA32, All RH

FULL JDK VERSION(S):
java version "1.4.2-beta"
Java(TM) 2 Runtime Enviornment , Standard Edition (build 1.4.2-beta-b06)
Java HotSpot(TM) Client VM (build 1.4.2-beta-b06, mixed mode)

Exact steps to reproduce:

1)Create two users belonging to  same primary group and secondary group
for e.g
uid=501(ben) gid=100(users) groups=100(users),101(maxwell)  
uid=500(richard) gid=100(users) groups=100(users),101(maxwell) 

2)Build the hello.c file and Wrapper.java file for one user.
  for e.g
  -rwxr-xr-x    1 richard  users        8345 2004-08-02 23:34 hello

3)As root, change the permissions and ownership of the "C" program        
  to another user
  for e.g.
  -r-xr-x---    ben:maxwell      hello

4) As "richard", the program can still be run  
   i.e.                            
    [janet:/home/richard/test]hello                                     
    o/p-->  HelloWorld                                                  

   But the Java wrapper fails to find the program
  [janet:/home/richard/test]java Wrapper 
   o/p --->
    java.io.IOException: java.io.IOException: ./hello: cannot execute
    at java.lang.UNIXProcess.<init>(UNIXProcess.java:143)
    at java.lang.Runtime.execInternal(Native Method)
    at java.lang.Runtime.exec(Runtime.java:566)
    at java.lang.Runtime.exec(Runtime.java:428)
    at java.lang.Runtime.exec(Runtime.java:364)
    at java.lang.Runtime.exec(Runtime.java:326)
    at Wrapper.main(Wrapper.java:16)
  

Source code that demonstrates the problem:-
-----------------------------------------------------------------------
hello.c:

 #include <stdio.h>                                              
 #include <stdlib.h>                                             
 #include <stddef.h>                                             
                                                                        
 int main( void )                                                
 {                                                               
     printf( "HelloWorld\n" );                                     
     system( "id -a > out.txt" );                                  
     return 66;                                                    
 }                              

Wrapper.java:
import java.io.IOException;                                     
                                                                        
public class Wrapper {                                          
                                                                        
   public static void main(String[] args) {                      
                                                                        
   String program = "./hello";                                   
   if (args.length > 0)
   {                                      
              program = args[0];                                        
   }                                                           
                                                                        
   Runtime r = Runtime.getRuntime();                           
                                                                        
   try {                                                       
           Process p = r.exec( program );                            
           p.waitFor();                                              
           System.out.println( p.exitValue() );                      
       }                                                           
       catch (IOException e)
       {                                     
              e.printStackTrace();
       }                                                           
       catch (InterruptedException e)
       {                            
              e.printStackTrace();                                      
       }                                                           
  }                                                             
}                                       

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