prakash narayan killer s o aapps using j2 e e

Founding Sponsors

This Presentation Courtesy of the

International SOA Symposium

October 7-8, 2008 Amsterdam Arena

www.soasymposium.com

[email protected]

Gold Sponsors

Platinum Sponsors

Silver Sponsors

SOA & Java EE: Developing killer SOA applications using the Java EE Platform

Prakash NarayanSun Microsystems

2

Goal

Visualizing and developing composite applications using BPEL, SOA and Java EE

3

Agenda

Composite ApplicationsServices and SOAJava EE ServicesBPEL in the MixPutting it all together with NetBeansSummaryDemo

4

Applications

• Developers need to build end-to-end applications> Front-end user interfaces> Middle-tier business logic> Back-end resources

• With the right approach, developers can...> Reuse existing parts> Build new parts> Glue old and new parts together

• With the wrong approach, developers must...> Reimplement functionality existing elsewhere> Spend massive effort to evolve applications

5

Applications

• Real-world applications are...> ...not Web applications> ...not Java EE applications> ...not Swing forms> ...not Web services> ...not BPEL processes> ...not SOA> ...not JBI> ...not RDBMSs> ...not (your favorite technology)

• Real-world applications use many or all of these

6

Applications

• Traditional model of application development> Point technologies, products, and APIs> For example: EJB, Spring, Hibernate, JSF, Servlets, Struts, etc.

> Lots of glue written by developers>Requires a great deal of expertise & time> Inflexible

7

Composite Applications

• A way to compose applications from reusable parts• Comprised of heterogeneous parts> Some existing parts> Some new parts> Some glue to connect these parts

• Composite applications are Applications!> Composite applications != SOA

• Composite applications employ SOA principles> Features exposed as Web services> Standards-based interaction between services> Are themselves composable

8

Agenda


9

What Are Services?

• Black-box components with well-defined interfaces> Performs some arbitrary function> Can be implemented in myriad ways

• Accessed using XML message exchanges> Using well-known message exchange patterns (MEPs)

• Services are self-describing• Metadata in the form of WSDL describes...> Abstract interfaces > Concrete endpoints

10

What Can Services Do?

• Perform business logic• Transform data• Route messages• Query databases• Apply business policy• Handle business exceptions• Prepare information for use by a user interface• Orchestrate conversations between multiple services• …

11

How Are Services Implemented?

• Enterprise JavaBeans™ (EJB™) technology• BPEL• XSLT • SQL• Business rules• Mainframe transaction• EDI transform• Humans (yes, really!)• …

12

Example: Purchase Service

BidRequest

BidRequest

Bid

Supplier

LowestBid

Accept/Reject

ShipNotice

Buyer PurchaseService

Accept/Reject

ShipNotice

13

Purchase Service Functions

BuyerEndpoint

SupplierEndpoint

BuyerConversation

SupplierConversation

Transaction Fees

SupplierSelection

Buyer Credit

Supplier Routing

ProductConversion

14

Purchase Service Functions

BuyerEndpoint

SupplierEndpoint

BuyerConversation

SupplierConversation

Transaction Fees

SupplierSelection

Buyer Credit

Supplier Routing

ProductConversion

WSDL/Soap

XQuery

EJB

BPELBPEL

WSDL/Soap

Rule

Routing Table

XSLT

15

Service Oriented Architecture (SOA)

• An architectural principle for structuring systems into coarse-grained services• Technology-neutral best practice• Emphasizes the loose coupling of services• New services are created from existing ones

in a synergistic fashion• Strong service definitions are critical• Services can be re-composed when business

requirements change

16

Benefits of SOA

• Flexible (Agile) IT> Adaptable to changing business needs

• Faster time to market> Reuse existing code> Minimize new development

• Business- and process-driven> Enables new business opportunities

• Greater ROI > Leverage existing IT assets

17

Agenda


18

Java EE 5 Overview

• Key development features> EJB 3.0> Annotated “plain old Java object” (POJO) Web services> Powerful Java Persistence API (JPA) for O-R mapping> JAX-WS 2.1 and JAXB 2.1> Samples and blueprints

• Open ESB Starter Kit> Java Business Integration (JBI) runtime> BPEL service engine> SOAP-over-HTTP binding component

• GlassFish V2

19

Java EE Services

• Use EJB 3.0 to develop standards-based worker services> Perform business logic> Access JDBC resources> Call other Web services, including BPEL processes> Transactional> Secure

• JAX-WS 2.1 and JAXB 2.1> Full support for XML Schema> Document-centric services

• Call these services from BPEL processes

20

EJB 3.0 Example@Stateless()@WebService()public class LoanProcessor { @WebMethod public String processApplication(..., @WebParam(name="applicantAge") int applicantAge,...) {

int MINIMUM_AGE_LIMIT = 18; int MAXIMUM_AGE_LIMIT = 65;

String result = "Loan Application APPROVED."

if (applicantAge < MINIMUM_AGE_LIMIT) { result = "Loan Application REJECTED - Reason: Under-aged "+applicantAge+". Age needs to be "+ over"+MINIMUM_AGE_LIMIT+" years to qualify."; return result; } ... } }

21

Agenda


22

Need for Business Process

• Developing the web services and exposing the functionality (via WSDL) is not sufficient

• Example:> Concert ticket purchase Web service has 3 operations,

which need to be performed in the following order>Getting a price quote>Purchase a ticket>Confirmation and cancellation

• We also need a way to orchestrate these functionality> Sequencing> Conditional action

23

Business Processes

• Any technology for implementing real-world business processes needs to...> Coordinate asynchronous communication between

services> Correlate message exchanges between partners> Exchange messages in a universal form> Process activities in parallel> Manipulate/transform data between partners> Support long-running business transactions> Handle exceptions> Provide compensation to undo previous actions

24

What is BPEL?

• BPEL = Business Process Execution Language> XML-based language used to specify business

processes based on Web services> Orchestrates partner Web services

• BPEL processes describe...> Long-running, stateful, transactional conversations

• BPEL is one language for implementing a service> A BPEL service is itself a WSDL-described service> Can be used from other services or BPEL processes like

any other Web service

• BPEL processes are easy to write and change

25

What is BPEL?

• Cannot “do” much without other services> Orchestrates other WSDL-described Web services> Can't access non-Web service components> Other partner services do the real work> These are called functional services or worker services

• Excels at...> Parallelism> Long-running conversations> Sending and receiving Web service messages> Complex decision logic> Fault handling and compensating logic

26

BPEL: Relationship to Partners

Orchestrating Process(BPEL)

Partner Service

Partner Service

Partner Service

Partner Service

WSDL

27

BPEL: Relationship to Partners

Orchestrating Process(BPEL)

InventoryChecker Service

Credit checker Service

Another Partner Service

CustomerService

WSDL

28

Example Business Process

Invoke <InventoryService> Invoke <CreditService>

Reply <Invoice>

Receive <PO> <sequence>

<flow>

</sequence>

29

BPEL Document Structure<process>

<partners> ... </partners>

<variables> ... </variables>

<correlationSets> ... </correlationSets>

<faultHandlers> ... </faultHandlers>

<eventHandlers> ... </eventHandlers>



<receive> ... </receive>

<reply> ... </reply>

<invoke> ... </invoke>

</process>

30

BPEL Works With WSDL

• Web services are described in WSDL> Operations are message exchanges

> Each operation represents an individual unit of action

• We need a way to orchestrate these operations with multiple web services in the right order to perform a Business process> Sequencing, conditional behavior etc.

• BPEL provides standard-based orchestration of these operations

31

BPEL “Fixes” WSDL

• WSDL describes an unordered set of operations> Operations are grouped as interfaces> Operations are individual message exchanges

• Semantics of the interface are missing in WSDL> Order of invocation> Concurrency> Choreography with external entities

• BPEL can supply these missing semantics

32

Agenda


33

NetBeans IDE 6.1● Support for composite applications in NetBeans 6.1● Design BPEL business processes to orchestrate:

● Java EE Web services● External Web services● Other BPEL processes

● Develop secure, identity-enabled Java EE Web services

● Visualize, analyze, and edit real-world XML Schema, WSDL, and XML instance documents

● Download: http://www.netbeans.org

34

Web Service Orchestration● Visually author BPEL 2.0 business processes with

the BPEL Designer● Step-through debugging support● Built-in testing capability for unit testing● “Beyond syntax” validation of Schema, WSDL, and BPEL

● BPEL Mapper● Visually create complex XPath expressions without coding

● Deploy to the built-in BPEL engine● JBI-based BPEL service engine + SOAP/HTTP bindings● Running within the bundled GlassFish V2 Server

35

Types of SOA “NetBeans” Projects

36

BPEL Module Project

• BPEL Module project is a group of source files which includes > XML Schema (*.xsd) files> WSDL files> BPEL files

• Within a BPEL Module project, you can author a business process compliant with the WS-BPEL 2.0 language specification.• Will be added to a Composite application as a JBI

module

37

Composite Application Project

• Composite Application project is a project whose primary purpose is to assemble a deployment unit for the Java Business Integration (JBI) server > BPEL Module projects must be added to a Composite

Application project in order to be deployed to the BPEL runtime.

• The Composite Application Project can also be used to create and execute test cases that can then be run, in JUnit fashion, against the deployed BPEL processes.

38

Composite Application Project

• With a Composite Application project, you can:> Assemble an application that uses multiple project types

(BPEL, XSLT, IEP, SQL, etc.)> Configure external/edge access protocols (SOAP, JMS,

SMTP, and others)> Build JBI deployment packages> Deploy the application image to the target JBI server> Monitor the status of JBI server components and

applications

39

Agenda


40

Summary

• SOA enables flexible and agile enterprise application architecture• Services can be created and used using Java EE• BPEL is a service orchestration language

for creating composite applications• Services can be re-implemented using other

technologies as long as service interfaces are preserved without changing consumers• Java Business Integration (JBI) is the enabling

infrastructure

41

DEMO

42

Call to Action!

• Download NetBeans IDE 6.1 : http://download.netbeans.org/netbeans/6.1/final/

• Join Sun Developer Network (SDN) for up-to-date SOA information:http://developers.sun.com

43

Resources

• http://www.netbeans.org/features/soa/index.html• http://java.sun.com/integration• http://www.sun.com/products/soa• http://blogs.sun.com/gopalan

44

Q & A

• Questions?

SOA & Java EE: Developing killer SOA applications using the Java EE Platform

Thank [email protected]