Re: Running external C routine from a servlet ? The solution...

[Michel Jubault <mi...@free.fr>]

Hi Rick !

I've found a better way to precise the default directory for a particular
subprocess :
rather than using : exec(String command) to launch your process,
use : exec (String command, null, File directory) where directory is the
default dir for your external routine !!
It's working well for me !!

For building a near relative path to save files, I'v found :
String external_dir_path = System.getProperty("catalina.home") +
 System.getProperty("file.separator") + "webapps" +
 System.getProperty("file.separator") + "myapp" +
 System.getProperty("file.separator") + "WEB-INF" +
 System.getProperty("file.separator") + "classes" +
 System.getProperty("file.separator") + "external" +   <------- or whatever
you want !!
 System.getProperty("file.separator");
Yes, it's relative to tomcat home, but it's better than absolute path !!!!
It makes your webapp easier to adapt to another system (other server, linux,
windows,...).

Thanks again for your help !
Regards
Michel


----- Original Message -----
From: Bradberry, Rick <rb...@exchange.DAYTONOH.NCR.com>
To: 'Tomcat Users List' <to...@jakarta.apache.org>
Sent: Saturday, August 02, 2003 4:23 PM
Subject: RE: Running external C routine from a servlet ? Please help me !!!!


> Michel,
>
> I had a similar problem creating files in a servlet. I found that in my
> case, the relative
> path start in the directory where tomcat is started. I changed the startup
> script to do a
> cd to $tomcat_home then called bin/startup.sh.
>
> Hope this helps
>
> Rick Bradberry
> NCR WCS Managed Services
> Telephone: 937-848-2203
> Cell Phone: 937-367-1879
> efax: 413-674-7094
>
>
> -----Original Message-----
> From: Michel Jubault [mailto:michel.jubault@free.fr]
> Sent: Saturday, August 02, 2003 9:45 AM
> To: tomcat-user@jakarta.apache.org
> Subject: Running external C routine from a servlet ? Please help me !!!!
>
>
> Hi there !
>
> I'm running a little C program from a servlet. I'm using runtime, process
> and exec to do this. I gather the result in an inputstream. In fact
there's
> no pb on that.
> The problem is rather a path problem. All servlets in my app are using
> relative path to found the others and properties file ie the working
> directory is myapp/WEB-INF/classes. But for C program the default path is
> always the home path ie /root or /home/user.
> I must build the complete absolute path to launch my C routine. I don't
> understand why the default path isn't the classes path as for servlet.
> I'm running under linux Red HAT 7.3, java 1.4.1_02, Tomcat 4.1.24.
>
> Is there any config  file to modify in tomcat, linux or java?
>
> Please help !
>
> Many thanks in advance !
>
> Michel
>
>
>
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