https://github.com/frida/frida-java-bridge/issues/63

hook_loadLibrary.js

Java.perform(function() {
    const System = Java.use('java.lang.System');
    const Runtime = Java.use('java.lang.Runtime');
    const SystemLoad_2 = System.loadLibrary.overload('java.lang.String');
    const VMStack = Java.use('dalvik.system.VMStack');

    SystemLoad_2.implementation = function(library) {
        send("Loading dynamic library => " + library);
        try {
            const loaded = Runtime.getRuntime().loadLibrary0(VMStack.getCallingClassLoader(), library);
            if(library === 'myLib') {
                //do my stuff
            }
            return loaded;
        } catch(ex) {
            console.log(ex);
        }
    };
});