This sounds like it could be related to the Custom ClassLoader problem.
Most Servlet Engines use a Custom ClassLoader to automatically reload class
files in the <server_root>/servlets subdirectory. This works great, except
that it interferes with Native calls, which may be what's causing your
problem. Try moving your servlet out of the <server_root>/servlets and see
if the problem goes away.
(*Chris*)
----- Original Message -----
From: David Valentine <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, March 29, 1999 11:49 PM
Subject: Re: Executing system command from a servlet
> I too am having the same problem using "Runtime.exec". According
> to Jason Hunter's most excellent book I should be able to use
> this method, and additionally he provides an example. He points
> out that there may be a problem with the Security Manager of the
> web server in terms of granting access to execute programs.
> In light of fixing this I have gone through all of the settings
> in the administration applet and set "Execute programs" to Yes. I
> am running JWS 1.1.3 on Solaris, and have granted execute
> programs to the following attributes:
>
> In the defaultRealm:
> admin
> jeeves
> In the servlet Mgr Realm:
> admin
> unsigned
> In the UNIX realm:
> myUserName
>
> I have added the servlet to the list of servlets, and added the
> servlet to the Resources section in Security. Despite doing this
> I still appear to not be able to gleen any output from a
> runtime.exec call. The access logs provide no additional
> information, and do not report any errors. Is there some security
> setting somewhere I am missing, or is this a bug?
>
> ~David
>
> ==========================================
> David Valentine
> Software Design Engineer, NEC Australia
> [EMAIL PROTECTED]
> (61) 3 9271 4541
> ==========================================
>
> > -----Original Message-----
> > From: A mailing list for discussion about Sun Microsystem's
> > Java Servlet
> > API Technology. [mailto:[EMAIL PROTECTED]]On Behalf
> Of Tim
> > Leist
> > Sent: Thursday, March 25, 1999 12:08 PM
> > To: [EMAIL PROTECTED]
> > Subject: Executing system command from a servlet
> >
> >
> > Hi,
> > The following code runs fine from a command line
> application,
> > returning information from the exec() Process. But when the
> code is
> > executed in a servlet, the servlet seems to hang. The system
> > process is
> > starts but can't seem to communicate with the servlet. Is
> there any
> > reason a servlet can't read the input stream from a Process?
> > -----<snip>
> > file://execute the system command.
> > try {
> > Runtime shell = Runtime.getRuntime();
> > Process p = shell.exec( cmd);
> > file://Get the input stream of the subprocess.
> > BufferedReader in = new BufferedReader(new InputStreamReader(
> > p.getInputStream()));
> > file://Get the error stream of the subprocess.
> > BufferedReader err = new BufferedReader(new
> InputStreamReader(
> > p.getErrorStream()));
> >
> > String line;
> > while ( ( line = in.readLine()) != null)
> > System.out.println( line);
> >
> > while ( ( line = err.readLine()) != null)
> > System.out.println( line);
> > } catch (IOException e)
> System.out.println( e.getMessage());}
> > ---------<snip>
> > Thanks
> >
> > ______________________________________________________________
> > _____________
> > To unsubscribe, send email to [EMAIL PROTECTED] and
> > include in the body
> > of the message "signoff SERVLET-INTEREST".
> >
> > Archives:
> http://archives.java.sun.com/archives/servlet-interest.html
> > Resources:
> > http://java.sun.com/products/servlet/external-> resources.html
> >
> > LISTSERV Help:
> > http://www.lsoft.com/manuals/user/user.html
> >
>
>
___________________________________________________________________________
> To unsubscribe, send email to [EMAIL PROTECTED] and include in the
body
> of the message "signoff SERVLET-INTEREST".
>
> Archives: http://archives.java.sun.com/archives/servlet-interest.html
> Resources: http://java.sun.com/products/servlet/external-resources.html
> LISTSERV Help: http://www.lsoft.com/manuals/user/user.html
___________________________________________________________________________
To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
of the message "signoff SERVLET-INTEREST".
Archives: http://archives.java.sun.com/archives/servlet-interest.html
Resources: http://java.sun.com/products/servlet/external-resources.html
LISTSERV Help: http://www.lsoft.com/manuals/user/user.html
