Building Java 8 Web Applications with Microservices

Building Java 8 Web Applications with Microservices LiveLessons Workshop utilizes live code demonstration to build a fully functional application using minimal external dependencies and Java 8. This application consumes a real-time feed of high-velocity data, contains services that make sense of the data, and presents it in a JavaFX dashboard. Along the way, you’ll encounter Java 8 streams, lambdas, new ways of working with collections, and the new date and time API.

The source code repository for this LiveLessons Workshop can be downloaded from https://github.com/trishagee/sense. Download the “skeleton” branch.

About the Instructor

Trisha Gee, Java Champion, has developed Java applications for a range of industries, including finance, manufacturing, technology, open source, and non-profit, for companies of all sizes. She has expertise in Java high-performance systems, and is passionate about enabling developer productivity. Trisha blogs regularly on subjects developers and other humans should care about, is a leader of the Sevilla Java User Group, and is a key member of the Java Community. She believes we shouldn't all have to make the same mistakes again and again.

Twitter: @trisha_gee

Skill Level

• Intermediate

What You Will Learn

• Sort messages containing information about users to create a leaderboard of the most active Twitter users
• Consume messages about tweet sentiment to create a pie chart that updates in real time to show overall mood on Twitter
• Filter sentiment messages to create a view of happiness levels over a ten-minute period
• Build a microservice that parses a file of real Twitter data and publishes these tweets via web sockets
• Build a microservice that parses Twitter messages and emits just the username
• Build a microservice that analyses Twitter messages for sentiment and publishes these moods
• Connect the application to a live Twitter feed

Who Should Take This Course

• Experienced Java developers familiar with Java 7 looking to learn Java 8

Course Requirements

• Working knowledge of the Java programming language

Table of Contents

Introduction

Lesson 1: Introduction to Java 8 Features

• Overview of Java 8
• Our application
• Creating a stub user service
• What are lambdas?
• The basics of JavaFX
• New Java 8 methods on existing APIs
• Introduction to streams
• Creating the UI
• How did Java 8 help us?

Lesson 2: Lambdas Will Simplify Your Code

• Create a stub mood service
• Updating a pie chart with moods—Part 1
• Updating a pie chart with moods—Part 2
• Filtering moods to display happiness over time
• Questions and discussion

Lesson 3: Creating Simple WebSocket Services

• An introduction to WebSockets—Part 1
• An introduction to WebSockets—Part 2
• Creating a service to publish data from a file

Lesson 4: Java 8 for Business Logic

• Creating a simple user service
• Creating a service to analyze tweet mood

Lesson 5: Questions and Discussion

• Questions and discussion

Summary

About LiveLessons Video Training

The LiveLessons Video Training series publishes hundreds of hands-on, expert-led video tutorials covering a wide selection of technology topics designed to teach you the skills you need to succeed. This professional and personal technology video series features world-leading author instructors published by your trusted technology brands: Addison-Wesley, Cisco Press, IBM Press, Pearson IT Certification, Prentice Hall, Sams, and Que. Topics include: IT Certification, Programming, Web Development, Mobile Development, Home and Office Technologies, Business and Management, and more. View all LiveLessons on InformIT at: http://www.informit.com/livelessons.