Tomcat, Postgresql security settings

Hi all,
Anyone here run Tomcat 5.5 on Debian? I'm trying to get Tomcat5.5
working with Poestgresql. I know I got everything configured right
because if I turn Tomcat security off, in /etc/default/tomcat,
everything works fine and I get a connection. My application directory
is at /usr/share/tomcat5.5-webapps/ROOT/myapp. I want security on so
this is my /etc/tomcat5.5/policy.d/02debian.policy file:

// These permissions apply to all JARs from Debian packages
grant codeBase "file:/usr/share/java/-" {
permission java.security.AllPermission;

};

//Driver location
grant codeBase "file:/usr/share/tomcat5.5/common/lib/-" {
permission java.security.AllPermission;

};

grant codeBase "file:/usr/share/tomcat5.5-webapps/ROOT/myapp/-" {
permission java.security.AllPermission;

};

grant codeBase "file:/usr/share/ant/lib/-" {
permission java.security.AllPermission;

};

It doesn't work so could someone tell me where I'm going as stray?

Thanks.
Chris