Frida, hook OKHttp Library does not work with examples - frida

Question

I'm trying to hook functions of the OKHttp library by using then following Frida script:
setTimeout(function(){
Java.perform(function (){
console.log("-- Hook OKHttp library --");
try {
var Builder = Java.use('okhttp3.CertificatePinner$Builder');
var Pin = Java.use('okhttp3.CertificatePinner$Pin');
var OkHttpClient = Java.use('okhttp3.OkHttpClient$Builder');
console.log("OkHTTP classes found");
Builder.add.overload.implementation = function(a, b) {
console.log("TEST ADD");
}
Pin.matches.overload.implementation = function (a) {
console.log("TEST matches")
return true;
}
OkHttpClient.certificatePinner.overload.implementation = function (a) {
console.log("TEST certificatePinner");
}
console.log("OkHTTP functions found");
} catch (err) {
// If we dont have a ClassNotFoundException exception, raise the
// problem encountered.
console.log("OkHTTP 3.x classes/functions not Found");
}
});
},0);
And I am executing the following code in my Android application:
CertificatePinner certificatePinner = new CertificatePinner.Builder()
.add(certificateDNWildcard, certificateHash)
.build();
//Create http client with pinned certificate
OkHttpClient okHttpClient = new OkHttpClient.Builder()
.certificatePinner(certificatePinner)
.build();
As you can see I am calling the function .add(certificateDNWildcard, certificateHash) which I am trying to hook. However, nothing is printed in the terminal when I execute this function. Furthermore, the output of my terminal is:
-- Hook OKHttp library --
OkHTTP classes found
OkHTTP functions found
Hence, it does find the classes and functions; however, the hook itself does not work effectively. Could someone help me?
I am using:
* Frida 12.8.11
* Android 10
* ARM64

Answer 1

You should either:
// works if add method has a single implementation
Builder.add.implementation = function(a, b) {
console.log("TEST ADD");
}
or
// always works
Builder.add.overload('java.lang.String', 'java.lang.String').implementation = function(a, b) {
console.log("TEST ADD");
}