Experience meets Vision © Wincor Nixdorf International GmbH 1 Banking Division Application Software Sun Certification Sun Certified Enterprise Architect

Experiencemeets Vision

© Wincor Nixdorf International GmbH

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Application Software

Sun CertificationSun Certification

Sun Certified Enterprise Architect (SCEA)



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Agenda

1. Sun Certification Programs1. Sun Certification Programs

2. Der IT-Architekt2. Der IT-Architekt

3. SCEA – Aufbau und Prüfungen3. SCEA – Aufbau und Prüfungen

4. Eindrücke und Erfahrungen4. Eindrücke und Erfahrungen



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Sun Certification Programs

Sun Certified Network Administrator for Solaris OS ...

Sun Certified Backup and Recovery Engineer ...

Sun Certified Programmer Sun Certified Developer Sun Certified Web Component Developer Sun Certified Business Component Developer Sun Certified Enterprise Architect

Sun Certified Developer for Sun ONE Application Server ...

Network/Storage

Solaris OS

Java Technology

Sun Software Products



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Der IT-Architekt (1)

"The ideal architect should be a person of letters, a mathematician, familiar with historical studies, a diligent

student of philosophy, acquainted with music, not ignorant of medicine, learned in the responses of jurisconsults, familiar

with astronomy and astronomical calculations."

Vitruvius, ca. 25BC



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Der IT-Architekt (2)

“The IT-architect understands the wants and needs of the client, designs a solution, communicates that design to the client for approval and to the builder for construction.”

IT-Architekt ist kein Experte! Muss für seine Aufgabe Technik- und Domänen-Experten hinzuziehen! (Er kennt alles - aber nichts genau! )

Was muss der IT-Architekt wissen? Produkte / Technologien / Integrationsmöglichkeiten Einarbeiten in Fachdomäne und Kundenumfeld

-> Erstellen der System Blueprints Software Engineering „Master of the Ilities“

Websphere

Web-Services

SOA/GRSA

Tibco Rendevouz

Soniq MQ

Clustering

MQ Series

DMZ

WebmethodsSun E10K

JXTA

E10K Z/OS MVS

CISC

IIOP

CORBA

R/3

SCEA Part I

SCEA Part II

Use Cases

CMM

Service Locator

RUP

Agents

ADO.NET

SA/SD

Java

C#Business Rule Engines

OOA/OOD

Banking 4+1 J2EE

SoC

MDA

DAO

UML/CWM

SCEA Part III

Scalability

Extensibility

Maintainability

3-Nines

24/7

Manageability

Performance

SLAs

Availability

Security

Reliability Usability

FR/NFR



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Aufbau SCEA

1. Multiple Choice Exam

(48 Fragen, 75 Minuten, 68%)



2. Architecture and Design Project

(Projekt, keine Zeitbegrenzung, 70%)



3. Essay Exam

(Fragen zum Projekt, 90 Minuten, Berechnung mit Projekt)

3. Essay Exam








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Part I – Multiple Choice Exam (1)

Aufgabe: „Show your knowledge of the IT!“

Inhalte: Common Architectures (Definition, Terminologie, NFR, Modelle, Konzepte) Documenting an Architecture (OOA/OOD, UML, 4+1, SAM, SW-Engineering) Patterns (GoF, Architectural, J2EE) Security (Java/J2EE Security, Kryptografie, Firewalls, DMZ, Topologien, Tunneling) Protocols & Object Frameworks (HTTP/S, IIOP, JRMP, CORBA, RMI) Legacy Connectivity (JCA, Techniken, Screen Scraper, Object Mapper) J2EE (Components, Lifecycles, TX, Persistence, APIs – JMS, JDBC, JNDI, etc.) Applicability of J2EE (Anwendbarkeit; J2EE,EJB,CMP – ja/nein) Internationalization (Terminologie, I18N in Java/J2EE) Messaging (Formen, Modelle, MOM, RPC, JMS, MDB)

Schwierigkeiten: kaum Unterlagen zur Vorbereitung sehr umfangreich



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Beispiel-Frage:

Toysrfuss, a national toy store is creating a new e-front for Order processing. Customers have to create an account to transact with them, although an account is not required for browsing the catalog. Customers can browse items and add them to a shopping cart. They can then proceed to checkout. At this time, they can update quantities and submit the order.

What technologies may be best suited for this app?a. JSP for presentation and Servlets as controllers.b. Servlets for presentation and JSP as controller. c. Stateless Session Bean for Shopping cart. d. Stateless session bean for catalog retrieval. e. Stateful Session bean for shopping cart. f. Stateful session bean for Order update. g. Entity bean for Catalog retrieval. h. Entity bean for Order update.

A: a)d&e&g b)a&b&e&h c)a&d&e&h d)b&e&f&g



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Beispiel-Frage:

Which of the following are not true about N-Tier Systems?1. N-Tier systems are distributed over many systems and hence always present a maintenance problem. 2. N-Tier systems are generally component based and are therefore quite easy to maintain. 3. Since N-Tier systems do not use database stored procedures or triggers for business logic processing, they are generally very slow. 4. Since N-Tier systems are container based, many N-Tier systems can be easily scaled (both vertically and horizontally). 5. N-Tier systems suffer only from one drawback over client/server systems - N-Tier systems do not take advantage of resource sharing techniques like connection pooling. 6. N-Tier systems can use various techniques for Identification, Authentication and Authorization and are therefore considered quite secure.

.

A: a)1&2 b)2&5&6 c)1&2&5 d)3&6 e)1&3&5 f)1&5



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Aufbau SCEA









3. Essay Exam


3. Essay Exam








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Part II – Architecture and Design Project (1)

Aufgabe: „Produce scalable, enterprise level system blueprints -

demonstrating your knowledge of IT architectures and J2EE!“ Flugbuchungssystem Ablöse- und Integrations-Projekt; drei beteiligte Unternehmen

Input: Beschreibungen vom Business Analyst (Use Cases, Business

Domain Model, Topologie, Schnittstellen-Spezifikationen) Mitschrift - Interview mit CIO/CEO

Schwierigkeiten: schlechte und teilweise widersprüchliche Requirements -

> Annahmen treffen keine ausgereiften UML-Tools schwierig, da kein Austausch zum Kunden und im Team!



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Auszug aus Interview:

Interviewer: Speaking of the Frequent Flyer system, why are you not replacing it with this rewrite?

FBN CEO: Let me handle this. We spent a half million dollars 6 months ago to get this system in place. I for one am not ready to throw it away and spend another half million to replace it. You will have to interface with what is there and if this project goes smoothly and the J2EE application servers prove to work, then we can talk about rewriting it.



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Lösung: Assumptions (Goal, Business, Technical, QoS) Architectural- and High-Level-Design-Decisions

Technologie-Auswahl Persistenz-Strategie TX Management Security Schnittstellen Abdeckung QoS/NFR ...

Modelling Class Diagram Component Diagram Deployment Diagram Sequence Diagrams



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Aufbau SCEA









3. Essay Exam


3. Essay Exam








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Part III – Essay Exam

Aufgabe: „Show your knowledge of QoS requirements and defend

your own architecture!“ Inhalte:

„Wie erreicht ihre Architektur die geforderte Performance?“

„Wie gut skaliert ihre Architektur?“



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Eindrücke & Erfahrungen (1)

Zeitraum: 4/03 – 7/03: Vorbereitung SCEA Part I 30.07.03: Prüfung Part I 9/03 – 12/03: Projekt SCEA Part II 15.12.03: Upload Part II 19.12.03: Prüfung Part III

Negativ: sehr zeitaufwändig komplexer Prozess, wenig Unterlagen schlechte Unterstützung durch Prometric

Positiv: Aufbau eines sehr umfangreichen Praxis-Wissens

(„lifelong learning“) Herausforderung



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Eindrücke & Erfahrungen (2)

The SCEA is a software architect certification a J2EE technology certification a time consuming process, but a beneficial

one...

Jedes System hat eine Architektur! (auch wenn man sie nicht plant )



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Q & A

Documents

Experience meets Vision © Wincor Nixdorf International GmbH 1 Banking Division Application Software Sun Certification Sun Certified Enterprise Architect