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Web Services Done Right Done Quickly. Matthew Fowler New Technology/ enterprise Ltd London. Agenda. NT/e's Experience Architecture for Web Services JeeWiz - A J2EE System Generator. NT/ e ’s Experience with BEA. 40 Projects on behalf of BEA All sizes - very large to small

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Web ServicesDone RightDone Quickly

Matthew Fowler

New Technology/enterprise Ltd


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NT/e's Experience

Architecture for Web Services

JeeWiz - A J2EE System Generator

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NT/e’s Experience with BEA

40 Projects on behalf of BEA

All sizes - very large to small

All roles - architect to deployer

All stages - Proof Of Concept to go-live

WLS Training - Development, Admin

WLS 4.0 -> WLS 6.1


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Some Projects

Banks: Deutsche, Dresdner, UBS Warburg

Finance: Capital One, EBRD, Crest

Comms: British Telecom, Nokia, Equant

FT100: BA, BP Amoco, Sainsburys

Others: FT, TAG Maclaren, Jumpy, Vizzavi

BEA Partners: Accenture, CSC, Scient

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Part 2.Architecture for Web Services

The Background - BT Project

The Battles

The Principles

The Architecture - A Synthesis

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British Telecom

Internal System Team

"Common Entry Point"

Multi-channel, multi-client ... large!

WLS replaced



The Background

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Client Systems


RetailCall Centre



WebLogic Server Mid-Tier

WebLogicEnterprise Login MUX






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The Battles

RMI or EJB access route

Straight-through, no value-add

Stateful or Stateless

Ru-Use on Business Objects

Access to "Entities"

Where is the business logic

Access to mainframes/back-end services

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RMI or EJB access route

Issue: RMI access simpler, it's an option

Need: Transaction & network management

Resolution: EJB - RMI excluded

Realisation: EJB Facade layer

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Straight-through, no value-add

Issue: enough business logic on mainframe

Need: access to login server

Resolution: Support straight-through

Value added

Transaction & network management

Access Routes at front and back ends

Realisation: Special Session EJBs

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Stateful or Stateless

Issue: amount of mid-tier information

Need: response-time/throughput goals

Resolution: allow either

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Re-Use on Business Objects ?

Issue: Scepticism concerning reuse on "Business Objects"

Need: ROI demands maximal reuse


Reusable "Business Objects"

Non-reusable "Business Process Objects"

Realisation: BPOs and BOs

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Access To "Entities"

Issue: "give me entity info, no biz process"

Need: simple multi-client access to entity information

Resolution: allow access to Biz Objects

Realisation: generic "BO Access" Session EJB

Caveat: use for retrieval only

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Where is the business logic

Issue: Why have business logic in mid-tier?

Need: Performance, ease of programming

Resolution: allow none, or lots

Realisation: three styles:

no business object

access to business object via generic EJB

use full BPO stack

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Little objects, big transactions

Multiple-choices for mainframe transactions

Migration to WebServices at M/F


Information Layer driven by Business Process

Smart mapping, caching, XML intermediate

Access to Mainframes/back-end services

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Access Routes (Servlets)

Pluggable Access Routes, e.g. SOAP, Http/XML

Accessible Services

Services (Session EJBs)

Client Identity, BP Selection, Exception Handling

Accessible Business Processes

Business Process Objects (Java)

Client-Specific Business Procedures

Business Concepts

Business Objects (Java)

e.g. AccountBO, CustomerBO, OrderBO

Dependent Data

e.g. OrderLine

Business Information

Information Objects (Java)

e.g. Account, Customer, Order

Dependent Data


Persistence / Transactions

EJB, Connectors, Web Services, CORBA

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Business ProcessAutomation


SOAP Client





Services - Session EJBs

Business Processes

Generic BO Access

Business Objects

Information Objects





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Done Right

Major long-term savings

Can handle highly complex processes

But not done quickly

Long Proof

Application Programmer training

How to do it quickly ???

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J2EE Development 1999-2001

The JeeWiz! Vision

How JeeWiz! Works


Next Steps

Part 2.The Java Enterprise System Builder

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J2EE Development 1999-2001

Start-up long and expensive

Architecture, PoC, Performance, Document

And finally … the application

Constant Change - EJB1.1/2.0, JSPs, Portals

Mixing of Infrastructure and App Development

Complex, difficult to change

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J2EE Development Example

8 months duration, average 4 people

Develop sample, productise, throw away

Develop sample, productise, document

Try to teach Application programmers

But it was really hard

Total cost: > DM 1,000,000

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The JeeWiz! Vision

First Vertical Slice, Localised, in 2 Weeks

Good for small or large enterprises

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The JeeWiz! Vision - Goals

Simplify for application developers

Easier adaptation to change

Package architectural patterns

Reduce start-up time

Reduce cost

Reduce risk

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How JeeWiz! Works

Application Development and Deployment

J2EE System

Components and Patterns for Web Services


Ant + Patterns + XML Specifications

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JeeWiz! Foundation - Tools

Ant - Java-based builder

more intelligence into the build process

Velocity - pattern generator

separate patterns from application definition


the new specification and interchange language

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JeeWiz! Foundation - Process

Patterns +Standards


Unit TestApp Servers

J2EE Expert

Patterns +Standards Specification



SystemTestApp Servers




Out-of-the-boxpatterns and standards

ProductionApp Servers


Assembler /Deployer

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JeeWiz! Foundation - Patterns

Application Specification

Generated Code and Descriptors

Directory Naming






File Naming






Java Object Naming

public class AccountPK {

public AccountPK() {}

abstract public int getAccountID();

abstract public void setAccountID( int i );





Code generation




Deployment descriptor generation




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JeeWiz! Foundation - Deployment

Runnable WLS configuration

Application programmer generates unit test deployment

Assembler / deployer add overrides

XSL-T (XML Transformations) today

'XMLMerge' utility tomorrow

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JeeWiz! Foundation

Patterns help application programmers

reduces effort

reduces complexity

reduces risk

eases maintenance

promotes standards

Foundation can be adapted to new areas

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JeeWiz! J2EE Patterns

Builds on the Foundation

Design language for J2EE applications

A complete set of patterns for

Web Services ...

to EJBs

Includes deployment

Doesn't (yet) include testing, Rational Rose

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Customer Benefits

Cheaper, quicker start-up

Improved productivity for bulk of developers

Cheaper, quicker maintenance

Clearer reponsibilities for personnel

Easier to use new technologies

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JeeWiz USPs

Combination of

build engine is end-to-end and adaptable

NT/e's EJB pattern

enterprise-level features for deployment

EJB2.0 and Web Services

No run-time overhead/cost

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JeeWiz! Futures

Automatic testing

Integration with Rational Rose / RUP

Documentation production

Business Rules using EJB2.0

JCA, integration with WLI