2012
marakana.com
Dan Rosen
~12h
English
The three day Java Web Services course provides a thorough guide to the design and implementation of RESTful web services using Java. We take students from the fundamental concepts of the REST architectural style and its embodiment in existing web standards, all the way through the creation and testing of a REST service. The course also illustrates how the decades-old HTTP protocol can in fact elegantly address a variety of "enterprise scale" issues, including high concurrency and atomic transactions.
Objectives
On completion of this course, students will have implemented and tested a "web scale" RESTful web service using the open-source Jersey and Jackson libraries. Students will be able to:
-Explain the fundamental concepts of the REST architectural style, and how they contrast against other web service architectures such as SOAP
-Use HTTP's rich vocabulary of verbs and headers, URIs and media types as the basic building blocks of a scalable, future-proof service
-Recognize and implement common patterns for constructing links, paginating and summarizing collections and providing atomic transactions
-Transfer and apply the RESTful principles, demonstrated in this course with Jersey and Jackson, to other libraries, frameworks and programming languages
Audience
The Java Web Services course is geared toward software developers with experience in the Java programming language. Familiarity with annotations is helpful. No other background with Java EE frameworks (such as servlets, servlet containers, JPA, etc.) or related technologies (e.g. Spring, OSGi) is required.
Concepts: REST vs. the Rest
The Richardson Maturity Model
Resources: identification, representations and manipulation
Hypermedia as engine of application state
HTTP Basics
"CRUD" mapped to verbs / methods
Introduction to HTTP Headers
A glance at Webmachine's "Big HTTP Graph"
Intro to JAX-RS and Jersey
Creating resource classes
Jersey annotations: HTTP methods and headers
Constructing responses: headers and bodies
Standalone deployment with SimpleServerFactory
Testing fundamentals: JUnit and Jersey-Client
Resource Representations
Standard internet media types
JAXB: standard annotations and "content negotiation" for XML and JSON
Jackson: a non-standard, JSON-optimized alternative
More testing: Jackson object mapping and Hamcrest pattern matching
Representation Recipes
Building links to related resources, and URI templates for families of resources
Aggregate representations
Combating representation bloat: summaries, expansions and pagination
"Enterprise" HTTP
Authentication
Optimizations: conditional requests (using modification dates and entity tags) and caching
Transactions: ephemeral resources
When does a GET have to be a POST?
Download File Size:1.36 GB
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