Search results for: Open API

March 9, 2018 by Sergey Kargopolov 3 comments

RESTful Web Services with Jersey and Spring Data JPA – Cheat Sheet

Create a Servlet Container deployable Jersey web application Create new Jersey web application using Maven. The project created with the below jersey-quickstart-webapp archetype can be built and deployed to a servlet container like for example Apache Tomcat. mvn archetype:generate -DarchetypeGroupId=org.glassfish.jersey.archetypes \ -DarchetypeArtifactId=jersey-quickstart-webapp -DarchetypeVersion=2.26 POM.XML Dependency to Support JSON To support JSON in your Jersey Web App add…

December 21, 2017 by Sergey Kargopolov 0 comments

Java 8 Functional Interface Tutorial

In this blog post I would like to share with you how to use Java 8 Functional Interfaces and how to create your own functional interface. What is Functional Interface? Functional interface is a Java interface with single abstract method. Below is a very simple example of a functional interface: package com.appsdeveloperblog; @FunctionalInterface public interface MyFunction<A,…

November 21, 2017 by Sergey Kargopolov 0 comments

Send Email Message Using AWS SES Java SDK

In this Java programming tutorial I would like to share with you a sample Java code that uses Amazon AWS SES(Simple Email Service) Java SDK to send an email message. I used this code implement Email Verification feature for my mobile app. The code below would send an email message containing an email verification link…

November 15, 2017 by Sergey Kargopolov 0 comments

Firebase Social Authentication. Example in Kotlin.

In this tutorial on Firebase and Kotlin, we will learn how to use Firebase Social Authentication API to implement User Registration feature and store user data in Firebase and then allow user to login into our mobile app using their social accounts for either Google, Twitter or Facebook. We will also learn how to fetch some user specific…

November 10, 2017 by Sergey Kargopolov 0 comments

Create TimePicker in Kotlin Programmatically

In this short Kotlin tutorial I am going to share with you how to create a TimePicker in Kotlin programmatically and how to update text label when the value of Hours or Minutes has changed. The below code example will cover: Create TimePicker and add it to LinearLayout Get input from TimePicker when user changes the value…

November 4, 2017 by Sergey Kargopolov 0 comments

Configure Hibernate to Use C3P0 Connection Pool

With this tutorial I wanted to share with you how to configure your Java project and it’s hibernate configuration file hibernate.cfg.xml to use a more professional and production ready connection pool provider C3P0. Hibernate’s internal connection pooling algorithm is rudimentary, and is provided for development and testing purposes. In my earlier blog posts I used…

October 31, 2017 by Sergey Kargopolov 0 comments

Create DatePicker in Kotlin

In this Kotlin code example we will learn how to create DatePicker in Kotlin programmatically. To break it in more details the code example below will cover: Create DatePicker in LinearLayout Initialize DatePicker with current date( Year, Month and Day) When user changes the DatePicker values, call OnDateChangeListener and get input from the DatePicker Set DatePicker values…

October 26, 2017 by Sergey Kargopolov 3 comments

Firebase Authentication Example in Kotlin

In this tutorial on Firebase and Kotlin, we will learn how to use Firebase Authentication API to implement user Registration feature and store user data in Firebase and then allow user to login into our mobile app using their username and password. We will also use Firebase and Kotlin in this tutorial to implement Email…

October 7, 2017 by Sergey Kargopolov 0 comments

ToDo List App with Kotlin and Firebase

In this lesson, we are going to build a simple ToDo app using using Kotlin and one of the most powerful real-time database API Google and Android provides us with – Firebase. Firebase is a real-time database which provides immense features to manage a mobile app. Actually, not even a mobile app, complex web apps…

September 26, 2017 by Sergey Kargopolov 0 comments

Swift Video Tutorials and Code Examples

The category “Swift” has been updated with a few very useful links which contain many video tutorials and code examples that will help you build many features for your mobile application with Swift. User registration, sign in and sign out video tutorials The set of 15 video tutorials on how to create user registration, login and logout will…

September 9, 2017 by Sergey Kargopolov 0 comments

Create XML Document in Java

With this short blog post I am going to share with you how to create XML document using Java. Often we need to send HTTP Post request that contains JSON or XML payload. Earlier I have shared a blog post on different ways to create JSON Payload by converting Java objects into JSON. Below is…

August 24, 2017 by Sergey Kargopolov 0 comments

Exception Handling in a RESTful Web Service

In this blog post I am going to share with you how to handle Exceptions in your RESTFul Web Service API and how to return expected JSON Payload message back to a mobile application if an error takes place in your Java code. For that I am going to use the exception @Provider annotation and…

August 7, 2017 by Sergey Kargopolov 0 comments

Token-based Authentication Example

In this blog post we will implement Token-base authentication and will learn how to use Access Token we have created in a previous blog post to communicate with Web Service endpoints which require user to be a registered user with our mobile application. If you have not followed the previous two blog posts then it…

August 5, 2017 by Sergey Kargopolov 2 comments

RESTful Web Service to Authenticate User and Issue Access Token

It time to learn how to create a Web Service to authenticate user with their user name and password and how to issue a unique secure access token which our Mobile Application can use to send HTTP requests and communicate with protected web services of our API. For a free video tutorial on how to…

August 1, 2017 by Sergey Kargopolov 2 comments

RESTful Web Service to Save a New User in Database

In this blog post I am going to share with you a way to create a RESTful Web Service to: Create a new user profile, Generate and save in database a user secure user password rather than an actual password provided by user, Return back as a response a custom user profile object(JSON) with information that…