Complex example of Gson serialization to JSON and then back to an Object from JS

gsonTest.js

// you should have java npm package installed and arapi81_build001.jar and gson-2.2.4.jar in the same folder where you run this code

var java = require("java");
java.classpath.push('arapi81_build001.jar');
java.classpath.push('gson-2.2.4.jar')		

var Arrays = java.import('java.util.Arrays');
var gson = java.newInstanceSync('com.google.gson.Gson');
java.newInstance('com.bmc.arsys.api.RegularForm', function(err, result){
	var form = result;
	form.setDefaultVUI('option 1', function (err){
		console.log('originalForm -> defaultVUI:', 'option 1');
		form.setKey('option 2', function(err) {
			java.newInstance('java.util.ArrayList', function(err, arrayList) {
				java.newInstance('com.bmc.arsys.api.PermissionInfo', function(err, permission) {
					arrayList.add(permission);
					arrayList.toArray(function(err, permissionArray){
						Arrays.asList(permissionArray, function(err, permissionList) {
							form.setPermissions(permissionList, function(err) {
								console.log('originalForm -> permissions:', permissionList);
								form.getKey(function(err, key){
									console.log('originalForm -> key:', key);
									gson.toJson(form, function(err, formJson) {
										console.log('form in JSON', formJson);
										form.getClass(function(err, formClass){
											gson.fromJson(formJson, formClass, function(err, recoveredForm) {
												console.log('recovered ->', err, recoveredForm);
												recoveredForm.getKey(function(err, key){
													console.log('recoveredForm -> key:',key);
													recoveredForm.getPermissions(function(err, permissions) {
														console.log('recoveredForm -> permissions:', permissions);
														recoveredForm.getDefaultVUI(function(err, defaultVUI) {
															console.log('recoveredForm -> defaultVUI:', defaultVUI);
															gson.toJson(recoveredForm, function(err, formJson2){
																var areEqual = formJson2 === formJson;
																console.log('JSON from recovered object is equal than the JSON obtained before:', areEqual);
															})
														});
													});
												});												
											});	
										});
									});
								});
							});
						});
					});
				});
			});
		});
	});
});