FilePermission Access Denied Error

I signed up for a service with a web host. The run Tomcat 4.  I uploaded a oriely jar file for use in File Upload process.
I don't have direct access to policy files so I can't make any changes to them.
I keep getting
java.security.AccessControlException: access denied (java.io.FilePermission /tmp read)
      at java.security.AccessControlContext.checkPermission(AccessControlContext.java:270)
      at java.security.AccessController.checkPermission(AccessController.java:401)
      at java.lang.SecurityManager.checkPermission(SecurityManager.java:542)
      at java.lang.SecurityManager.checkRead(SecurityManager.java:887)
      at java.io.File.isDirectory(File.java:698)
      at com.oreilly.servlet.MultipartRequest.(MultipartRequest.java:140)

I tried changing the FilePermission on /tmp directory to "write" using java.io.FilePermission.  But no success.
My JSP code looks like this:
<%@ page import ="java.util.*" %>
<%@ page import ="java.text.*" %>
<%@ page import ="java.net.*" %>
<%@ page import ="com.oreilly.servlet.MultipartRequest" %> -- This is the package that I use for file upload.
<%@ page import = "javax.servlet.http.HttpUtils" %>
<%@ page import = "java.io.*" %>
<%
   String temp_path = "";
            temp_path="/tmp/";
            FilePermission fp = new FilePermission(temp_path , "write");
            out.print(fp.getActions());
   MultipartRequest multi=new MultipartRequest(request, temp_path, 41 * 1024 * 1024);

I'm still getting the error and I'm not sure what else to do.
Please help.
mhson1978Asked:
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Tommy BraasConnect With a Mentor Commented:
You need to change the policy file of your Tomcat instance AND make sure that /tmp really exists and that you have write access to it.
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