when i try to connect to a database using macro I get invalid address error

I try to connect to a database using xtrf macros and I get this error

invalid database address: jdbc:mysql://"HostIp:PortNumber"/"db name"

this is the code I am trying to connect to db with

try {
    String url = "jdbc:mysql://host:port/"
    String db = "database name"
    String userName = "username"
    String password = "password"

    Connection conn = DriverManager.getConnection(url + db,userName,password)}
    catch(Exception e){
        return e.getMessage()
    }

however the same code works fine on my machine when I try it on Intellij, is there something missing in my code ?