Problems with exec() in Servlet

Question

Hi All,
In my project i have used exec()in servlets to get the ouput from the c- program.I am using linux 8.0 and the server is tomcat-4.1.24.so that i try this following code:-
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ServletExecute extends HttpServlet
public void doGet(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
String[] command={"/bin/csh","-c","home/anand/Ananth/grpmaschk.run sptest S"};/*Here the grpmaschk.run is a c-program which genarates an output that is passed to sptest as parameter and S is a argument which indicates the action is done from Servlet*/
res.setContentType("text/plain");
PrintWriter out=res.getWriter();
Process p=null;
Runtime rt=Runtime.getRuntime();
try
p=rt.exec(command);//Executing the action on command string
catch(Exception e)
out.println("The Error Message is:"+e.getMessage());
try
FileInputStream fin=new FileInputStream("/home/Ananth/sptest");/*
Once the output is generated from the c-program it will be stored in the sptest in /home/Ananth */
BufferedReader br =new BufferedReader(new InputStreamReader(fin));
String line=null;
while((line=br.readLine())!=null)
out.println(line); //From there i am reading the contents in it to be displayed in the browser
} catch(Exception e1)
out.println("The error message was:"+e1.getMessage());
Whren it is displayed in the browser i am getting an error
/home/Ananth/sptest not found which means that exec() is not working (or)executing.What is the problem here ???Plz. do provide a solution for this.It is quite Urgent.I will be waiting for ur replies.
Thanx,
m.ananthu

Answer 1

Hi sir,
Sorry for the mistake i did there but by using /home/....
also the output is not coming.
Here is the code again for ur reference:-
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ServletExecute extends HttpServlet
public void doGet(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
String[] command={"/bin/csh","-c","/home/anand/Ananth/grpmaschk.run","home/anand/Ananth/sptest S"};//corrected one
res.setContentType("text/plain");
PrintWriter out=res.getWriter();
Process p=null;
Runtime rt=Runtime.getRuntime();
try
p=rt.exec(command);
catch(Exception e)
out.println("The Error Message is:"+e.getMessage());
try
FileInputStream fin=new FileInputStream("/home/anand/Ananth/sptest");
BufferedReader br =new BufferedReader(new InputStreamReader(fin));
String line=null;
while((line=br.readLine())!=null)
out.println(line);
} catch(Exception e1)
out.println("The error message was:"+e1.getMessage());
Here exec(....) is going through but the path in FileInputStream is showing an error.The error message i got when i run it in the browser is :-
The error message was:/home/anand/Ananth/sptest (No such file or directory).Which means exec() function itself is not executed???. Is there any thing to do with security reasons or anything u need to configure in the tomcat configuration file??? Where i found that
when i give /home/anand/Ananth/grpmaschk.run only in the exec() then the output is diaplyed in the browser.So i think exec() is workuing well but not with this huge argument
String[] command={"/bin/csh","-c","/home/anand/Ananth/grpmaschk.run","home/anand/Ananth/sptest S"};
Pls. do provide a solution for this problem.I will be waiting for ur replies.....
Thanx,
m.ananthu