FilePermission feature?

[Dany Crepin]

SecurityManager in Tomcat 4.0.x
I don't succeed in giving classes in a specific webapp  "read,write" FilePermission. 
The wildcards never work.
  
 
 grant codeBase "file:${catalina.home}/webapps/my_app/WEB-INF/-" {
     permission java.io.FilePermission "${catalina.home}/my_app/-", 
                                       "read,write,delete";
};
 
 only
 
 grant codeBase "file:${catalina.home}/webapps/my_app/WEB-INF/-" {
     permission java.io.FilePermission "${catalina.home}/my_app/file1.txt", 
                                       "read,write,delete";
};
 
 will work. It's very annoying if I want to implement a file upload, or  for 
file-based counters, for example.

Any Idea