This five day class takes a comprehensive look at the state of the art in developing interoperable web services on the Java EE 6 platform. Students learn the key standards for both SOAP-based and RESTful services, and the Java architectures that have evolved to build interoperable services and clients. The course begins with an introductory module that covers both SOAP-based and RESTful services, and therefore both JAX-WS and JAX-RS. We then discuss JAXB, as this highly useful XML API is integral to both. The remainder of the course is split between two larger modules, each of which falls on one side of the fence: either SOAP services with JAX-WS, or RESTful services with JAX-RS. We cover SOAP, WSDL, and both WSDL-driven and Java-driven development paths for JAX-WS, as well as client-side development. Then students work with the Jersey implementation of JAX-RS to create RESTful services, from simple single-value interactions to more sophisticated services that manage CRUD (create/retrieve/update/delete) operations on more complex data types, using JAXB to marshal and unmarshal data over the wire.

Objectives

Describe the interoperable web services architecture, including the roles of SOAP and WSDL in component-based services and XML and HTTP in the REST architecture.

Understand the importance of the WS-I Basic Profile for interoperable web services.

Build JAX-WS services and clients that take full advantage of the automated data binding of JAXB.

Build WSDL-to-Java and Java-to-WSDL services, with equal facility.

Use JAX-RS to develop simple RESTful services.

Control dispatching to service methods based on URL patterns and HTTP methods.

Bind request values to method parameters when expressed as HTTP query parameters, form values, headers, cookies, and more.

Manage XML content using XML Schema and JAXB.

Incorporate XML entities into service input and output.

Take advantage of lifecycle and context services available to JAX-RS services as Java EE components.

Detailed Outline

1. Overview of Web Services
   • Why Web Services?
   • Service-Oriented Architecture
   • HTTP and XML
   • SOAP
   • WSDL
   • The SOAP Vision
   • The REST Vision
   • UDDI
   • The WS-I Basic Profile
   • Security
2. Web Services for Java EE
   • Hosting Web Services: Scenarios
   • Web Services for Java EE
   • JAX-WS and JAXB
   • Web-Services Metadata
   • WSDL-to-Java and Java-to-WSDL Paths
   • Provider and Dispatch APIs
   • SAAJ and JAXP
   • JAX-RS for RESTful Services
   • JAXR
3. The Java API for XML Binding
   • The Need for Data Binding
   • XML Schema
   • Two Paths
   • JAXB Compilation
   • Mapping Schema Types to Java
   • Java-to-XML Mapping Using Annotations
   • Marshaling and Unmarshaling
   • Working with JAXB Object Models
4. The Simple Object Access Protocol
   • Messaging Model
   • Namespaces
   • SOAP over HTTP
   • The SOAP Envelope
   • The Message Header
   • The Message Body
   • SOAP Faults
   • Attachments
5. Web Services Description Language
   • Web Services as Component-Based Software
   • The Need for an IDL
   • Web Services Description Language
   • WSDL Information Model
   • The Abstract Model — Service Semantics
   • Message Description
   • Messaging Styles
   • The Concrete Model — Ports, Services, Locations
   • Extending WSDL — Bindings
   • Service Description
6. The Java API for XML-Based Web Services
   • Two Paths
   • How It Works: Build Time and Runtime
   • The Service Endpoint Interface
   • Working from WSDL
   • Working from Java
   • RPC and Document Styles
   • One-Way Messaging
   • Binary Protocols
7. WSDL-to-Java Development
   • The @WebService Annotation
   • Generated Code
   • Scope of Code Generation
   • Parameter Order
   • More JAXB: Mapping Collections
   • More JAXB: Mapping Enumerations
   • Applying JAXB Customizations
8. Client-Side Development
   • Stubs and Proxies
   • Generated Code
   • Locating a Service
   • Invoking a Service
   • The @WebServiceRef Annotation
9. Java-to-WSDL Development
   • Generating the WSDL and Schema
   • The @WebMethod, @XmlParam, and Related Annotations
   • More JAXB: Mapping Inheritance
   • Controlling the XML Model
   • Controlling the WSDL Description
   • JAXB Customizations with @XmlJavaTypeAdapter
10. The Java API for RESTful Services
    • Applications
    • Resources
    • Sub-Resources
    • Providers
    • Scanning and @ApplicationPath
11. Dispatching Requests to Methods
    • The Application Path
    • The @Path Annotation
    • The HTTP Method Annotations
    • Sub-Resource Locators
    • Annotation Inheritance and Overriding
12. Parameter and Return Types
    • Simple Parameter Types
    • @Consumes and @Produces Annotations
    • @XXXParam Annotations
    • The @DefaultValue Annotation
    • Return Types
    • Binary Content
    • Delivering a File
13. Entities and Complex Content
    • Entity Providers
    • Built-In Entity Providers
    • Working with XML
    • Driving XML Representations from Schema
14. Context and Lifecycle
    • Reading Web Resources
    • Finding Java EE Components
    • Finding Databases
    • Security Contexts