By Marcel Caraciolo

http://mobideia.blogspot.com

Chapter 01 – Introduction to the Exam

SCMAD Certification 45mm

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Agenda

• Introduction• Java ME Platform• SCMAD Certification

Introduction

• Introduce the Java ME Platform• Introduce the SCMAD Exam

What is Java ME Platform?

•Subset of Java Platform•Execution environment • Resource – constrained devices

• Mobile Phones• PDA’s • Set-top boxes

Implementations

• Specifications are defined by JSR’s• Java Specification Requests

• Sun has a Windows/Unix development kit

• Device vendors pack VM’s implementation on devices

Main parties involved

• Companies involved

• ARM• IBM• LG• Motorola• Nokia• RIM• Samsung• Sony Ericsson

Java Editions

Java ME Platform

• Java SE defines a single VM and a single API

• At Java ME VM’s are based on “Configurations and “Profiles”. There are several VM types, to support devices with different capabilities, from cheap cellphones to TV setup-boxes with high-speed network and wired power supply.

Java ME Platform• Configurations define VM’s features (e.g. floating point support, security model) and basic API’s (e.g. classes at java.lang, java.util packages). They are composed by a subset of features from a regular VM and by some new API’s.• Profiles address “Horizontal” market segments. They define specific API’s for device set (e.g. user interface, application life cycle, persistence, events, etc.)

CLDC: Connected Limited Configuration

• Most limited configuration

• Devices: Mobile phones and PDA’s with limited power and connectivity

• Based on a subset of Java SE 1.3 API’s

• All other configurations are based on CLDC ( to avoid market fragmentation)

• Simplified security model• JNI is not allowed• No finalization (Object.finalize())• No file system• No Reflection or Serialization• No Collections Framework• According to the version, floating support may not be supported

CLDC Restrictions

• Closer to the Java SE than CLDC• Devices: Set-top boxes and PDA’s • No need for preverification• Inherit additional API’s from Java SE

CDC: Connected Device Configuration

• MIDP (Mobile Information Device Profile)• Designed for mobile phones• Provides GUI, persistence, networking, multimedia• Depends on CLDC

• Personal Profile• Designed for PDA’s and Set-top boxes• Provides AWT for other Java SE API’s• Runs on CDC

Available Profiles

• Provides:• Application Life-Cycle• User interface• 2D games• Multimedia• Persistence• Networking• Notifications• Security• Internet Application distribution with digital signature

MIDP: Mobile Information Device Profile

• Defines supplementary API:• WMA (JSR – 120) – Wireless messaging API (SMS messages)• MMAPI (JSR-135) – Mobile Media API (support for audio, video and media capture)• PIM and File API (JSR-75) – Access to device’s file system and contact list.• Web Services (JSR-172) - SOAP calls and XML parsing• Java API’s for Bluetooth (JSR-82)• Scalable 2D Vector Graphics for Java ME (SVG Support) • Mobile 3D Graphics API for Java ME (JSR-184)• Mobile Internationalization API (JSR-238)

Optional Packages

• Define no new API’s

• What it defines? • Requirements over other API’s aiming to reduce platform fragmentation• Minimum hardware and performance requirements

• Examples:• JTWI – Java Technology for the Wireless Industry• MSA - Mobile Service Architecture

“Umbrella” specifications

• Specified API’s:• CLDC 1.0 (1.1 may be used)• MIDP 2.0• WMA 1.1• MMAPI 1.1 (conditional)

• Some aspects left as optional by the API’s are required by JTWI• Define device features requirements (e.g. screen size, available memory).

JTWI: Java Technology for Wireless Industry

• Splits in “MSA Subset” and “MSA”• MSA Subset requires:

• CLDC 1.1• MIDP 2.1• MMAPI 1.1• WMA 2.0• PDA API (File and PIM)• Java API’s for Bluetooth (Bluetooth and Obex) (conditional)• Mobile 3D Graphics API• Scalable 2D Vector Graphics API (SVG)

MSA: Mobile Service Architecture

• Besides Subset’s API’s, full MSA requires:• J2ME Web Services (Web Services and XML parsing)• Security and Trust Services API (Encryption, smart card access (conditional), PKI access (conditional))• Location API (conditional)• SIP API (SIP protocol)• Content Handler API• Payment API• Advanced Multimedia Supplements (MMAPI extensions)• Mobile Internationalization (i18n)

MSA: Mobile Service Architecture

• SCMAD Certification•CX 310-110 Exam

Sun Certified Mobile Application Developer Exam

• Like other Sun certifications, this is a multiple choice exam taken at Authorized Prometric Testing Centers

• Requirements: SCJP (Any version)

• 150 minutes, 68 questions, Passing score 55%

• Website: http://www.sun.com/training/certification/java/scmad.xml

SCMAD Certification

SCMAD Certification Objectives

• Main Objective: JTWI• ME Platform• JTWI requirements and features• CLDC features and differences (1.0 and 1.1)• MIDP security model• Networking at CLDC and MIDP• Application delivery model• MIDP’s persistence, notification, GUI, game and sound API’s. • MMAPI 1.1• WMA 1.1

Future Work

• Next Chapter:

• Tools and requirements for Java ME development • First Java ME mobile Application: Hello World MIDlet• Configurations and Profiles – Differences

References

• ALVES F. Eduardo. SCMAD Study Guide, 27/04/2008.

• JAKL Andreas, Java Platform, Micro Edition Part 01 slides, 12/2007.

• Sun Certification Mobile Application Developer Website: [http://www.sun.com/training/certification/java/scmad.xml].