Allow traffic from specific IP to Specific URI

Try this, where AddressAllowedPool is the Data Group;

when HTTP_REQUEST {
    if { [HTTP::uri] contains "/abc/xyzServlet" and (not [class match [IP::addr [IP::client_addr] equals AddressAllowedPool ]) } { 
        reject } 
    else { pool Pool_servers }
}

We'll have to assume then that you're running a 9.x F5 version. The class command was introduced in v10.0.

So try this:

when HTTP_REQUEST { 
    if { ( [HTTP::uri] contains "/abc/xyzServlet" ) and not ( [matchclass [IP::client_addr] equals AddressAllowedPool ] ) } { 
        reject 
    } else { 
        pool Pool_servers 
    } 
}

It was not working because I was behind NAT. The server was looking at only one NAT IP address.

yes, after I added NAT IP address to AddressAllowedPool.

I need it to protect from outside users. This website is hosted on server is in the DMZ. I will create a Static NAT for Inside address to be allowed to this host on Firewall between Inside and DMZ network. I will add Static NAT address to DG. Thank you for your help! I really appreciate your time and help.