Permission problems when trying to execute simple system command

Hi, I am quite new to JSP so please forgive me if I ask really simple things... I am trying to run system commands on the server and display the output on a webpage. This is what I've got:
<%@ page import="java.io.*" %>
<HTML>
<BODY>
<%
    Runtime rt = Runtime.getRuntime();
Process p = rt.exec("/bin/ls");
// for reading the output of the program
// (out of the program is in for us)
BufferedReader sOut = new BufferedReader(new
        InputStreamReader(p.getInputStream()));
// read the output
String line;
while ((line = sOut.readLine()) != null)
        out.println("line<BR/>");
%>
</BODY>
</HTML>However, when I run this, I get the following:
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Exception in JSP: /research/test.jsp:7
4: <%
5: Runtime rt = Runtime.getRuntime();
6:
7: Process p = rt.exec("/bin/ls");
8:
9: // for reading the output of the program
10: // (out of the program is in for us)
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:451)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
sun.reflect.GeneratedMethodAccessor63.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
java.security.AccessController.doPrivileged(Native Method)
javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162)
root cause
java.security.AccessControlException: access denied (java.io.FilePermission /bin/ls execute)
java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
java.security.AccessController.checkPermission(AccessController.java:546)
java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
java.lang.SecurityManager.checkExec(SecurityManager.java:779)
java.lang.ProcessBuilder.start(ProcessBuilder.java:447)
java.lang.Runtime.exec(Runtime.java:593)
java.lang.Runtime.exec(Runtime.java:431)
java.lang.Runtime.exec(Runtime.java:328)
org.apache.jsp.research.test_jsp._jspService(test_jsp.java:49)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
sun.reflect.GeneratedMethodAccessor63.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
java.security.AccessController.doPrivileged(Native Method)
javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162)
Seems like it has something to do with the permissions granted to the JVM? I have googled high and low and still haven't found a way to solve it. I've also tried adding grant { permission java.io.FilePermission "file:/bin/ls", "execute"; } to my java.policy file but to no avail. Could somebody point out how to solve this? Thanks!

I would think it is an OS permission thing rather than java permission
What user is apache running as on this system?
Does the user apache is running as have permissions to run these commands, in the directory where you are running them? Try executing them yourself when logged in as that user.
I would also recommend you read the article [when runtime.exec() won't|http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html].
Cheers,
evnafets

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