How to implement an X509TrustManager using Frida

trust-manager.js

'use strict';

var TrustManager;
var manager;

Java.perform(function () {
  var X509TrustManager = Java.use('javax.net.ssl.X509TrustManager');

  TrustManager = Java.registerClass({
    name: 'com.example.TrustManager',
    implements: [X509TrustManager],
    methods: {
      checkClientTrusted: function (chain, authType) {
        console.log('checkClientTrusted');
      },
      checkServerTrusted: function (chain, authType) {
        console.log('checkServerTrusted');
      },
      getAcceptedIssuers: function () {
        console.log('getAcceptedIssuers');
        return [];
      }
    }
  });
  manager = TrustManager.$new();
});

Not working in Android 4.4.2 👎

[Samsung GT-I9505::PID::13669]-> 'use strict';

                                 var TrustManager;
                                 var manager;

                                 Java.perform(function () {
                                   var X509TrustManager = Java.use('javax.net.ssl.X509TrustManager');

                                   TrustManager = Java.registerClass({
                                     name: 'com.example.TrustManager',
                                     implements: [X509TrustManager],
                                     methods: {
                                       checkClientTrusted: function (chain, authType) {
                                         console.log('checkClientTrusted');
                                       },
                                       checkServerTrusted: function (chain, authType) {
                                         console.log('checkServerTrusted');
                                       },
                                       getAcceptedIssuers: function () {
                                         console.log('getAcceptedIssuers');
                                         return [];
                                       }
                                     }
                                   });
                                   manager = TrustManager.$new();
                                 });
undefined
Error: java.lang.ClassNotFoundException: Didn't find class "com.example.TrustManager" on path: DexPathList[[],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
    at frida/node_modules/frida-java/lib/env.js:220
    at ensureClass (frida/node_modules/frida-java/lib/class-factory.js:737)
    at frida/node_modules/frida-java/lib/class-factory.js:120
    at registerClass (frida/node_modules/frida-java/lib/class-factory.js:1939)
    at input:24
    at frida/node_modules/frida-java/lib/vm.js:39
    at y (frida/node_modules/frida-java/index.js:331)
    at frida/node_modules/frida-java/index.js:302
    at frida/node_modules/frida-java/lib/vm.js:39
[Samsung GT-I9505::PID::13669]-> exit

https://asciinema.org/a/KgLeRC2zDO4gEcoT8tdOerowt

same to error in ZTE U988S 4.4.4