Name: nt126004 Date: 06/12/2002


FULL PRODUCT VERSION :
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)

FULL OPERATING SYSTEM VERSION :
Windows NT Version 4.0
Service Pack 6a

A DESCRIPTION OF THE PROBLEM :
ClassLoader.getSystemResource returns a URL object whose
getFile method returns a string with an unwanted leading
slash. In particular, if the resource is a Windows
executable, the returned string will not work when passed
to Runtime.exec.

I guess this could alternatively be viewed as a bug in
Runtime.exec for not being able to handle a "valid" file
name.

It seems that the URL might be a valid URL according to the rfc,
but if so Runtime should be able to handle it. If the URL that is
generated is not correct, then ClassLoader needs to be fixed.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Create and compile Java test program

2. Create and compile C test program. Leave executable in
same directory as Test.class.

#include <stdio.h>
main() {
  printf("Hello\n");
}

3. Run Java test program:

java Test

EXPECTED VERSUS ACTUAL BEHAVIOR :
Expected that file name gotten from URL.getFile should work
when passed to Runtime.exec. Instead got file name with
spurious leading slash that is not acceptable to
Runtime.exec. Removal of offending slash produces file
name that is acceptable.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
> java Test
getProtocol() = file

getFile() = /D:/njoneill/java/UrlBug/Hello.exe

getPath() = /D:/njoneill/java/UrlBug/Hello.exe

exec without slash

exec with slash

java.io.IOException: CreateProcess: /D:/njoneill/java/UrlBug/Hello.exe error=123

at java.lang.Win32Process.create(Native Method)

at java.lang.Win32Process.<init>(Win32Process.java:61)

at java.lang.Runtime.execInternal(Native Method)

at java.lang.Runtime.exec(Runtime.java:546)

at java.lang.Runtime.exec(Runtime.java:413)

at java.lang.Runtime.exec(Runtime.java:356)

at java.lang.Runtime.exec(Runtime.java:320)

at Test.main(Test.java:19)

Exception in thread "main"


This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.net.*;
public class Test {
    public static void main(String[] args)
throws Exception {

// Hello.exe is just a simple C prog in same dir as Test.class
URL url = ClassLoader.getSystemResource("Hello.exe");

System.out.println("getProtocol() = " + url.getProtocol());
System.out.println("getFile() = " + url.getFile());
System.out.println("getPath() = " + url.getPath());

// Clip the leading slash and all is well
System.out.println("exec without slash");
Runtime.getRuntime().exec(url.getFile().substring(1));

// Leave the slash and generate an exception
System.out.println("exec with slash");
Runtime.getRuntime().exec(url.getFile());

    }
}


---------- END SOURCE ----------

CUSTOMER WORKAROUND :
Determine if you are running under Windows (by looking at
os.name system property perhaps) and remove leading slash
before handing to Runtime.exec.
(Review ID: 148166)
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