Samsung Basics of Java ME Draft

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Basics of Java ME

Version 0.9, Draft

INFORMATION GUIDE



Information Guide

Information Guide – v 0.9 of 10

COPYRIGHT Samsung Electronics Co. Ltd.

This material is copyrighted by Samsung Electronics. Any unauthorized reproductions,

use

or

disclosure

of

this

material,

or

any

part

thereof,

is

strictly

prohibited

and

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a

violation under the Copyright Law Samsung Electronics reserves the right to make

changes in specifications at any time and without notice. The information furnished by

Samsung Electronics in this material is believed to be accurate and reliable, but is not

warranted true in all cases.

Trademarks and Service Marks The Samsung Logo is the trademark of Samsung Electronics. Java is the trademark of

Sun Microsystems.

All other company and product names may be trademarks of the respective companies

with which

they

are

associated.



Information Guide


About This Document This document describes the basics of Java ME, and explains the building blocks of

MIDP Platform. This document explains different Profile, Configuration of Java ME.

Scope: This document is for novice users who want to know about the basics of Java ME. It

explains about most popular CLDC configuration and MIDP Profiles.

Document History: Date Version Comment

02/02/09 0.9 Draft

References: Java ME Platform Specification http://jcp.org/en/jsr/detail?id=68

Java ME Technology http://java.sun.com/javame/technology/index.jsp

CLDC 1.0 http://www.jcp.org/en/jsr/detail?id=30

CLDC 1.1 http://www.jcp.org/en/jsr/detail?id=139

MIDP 1.0 http://www.jcp.org/en/jsr/detail?id=37

MIDP 2.0 http://www.jcp.org/en/jsr/detail?id=118

Foundation Profile http://jcp.org/en/jsr/detail?id=46

Personal Profile

http://jcp.org/en/jsr/detail?id=62

RMI Profile http://jcp.org/en/jsr/detail?id=66

Game Profile http://jcp.org/en/jsr/detail?id=134

Personal Basis Profile http://jcp.org/en/jsr/detail?id=216

WMA API http://jcp.org/en/jsr/detail?id=120

MMAPI http://jcp.org/en/jsr/detail?id=135

Location API http://jcp.org/en/jsr/detail?id=179

SIP API http://jcp.org/en/jsr/detail?id=180

SATSA API http://jcp.org/en/jsr/detail?id=177

Mobile 3D API http://jcp.org/en/jsr/detail?id=184

WSA API


Bluetooth API http://jcp.org/en/jsr/detail?id=82



http://java.sun.com/javame/technology/index.jsp


http://www.jcp.org/en/jsr/detail?id=30



















































Information Guide


Abbreviations: JDK Java Development Kit

JRE Java Runtime Environment

Java ME Java Micro Edition

JTWI Java Technology for Wireless Information

MVM Multi Tasking Virtual Machine

AWT Abstract Window Toolkit

CDC Connected Device Configuration

CLDC Connection Limited Device Configuration

MIDP Mobile Information Device Profile

JSR Java Specification Request

JVM Java Virtual Machine

API Application Programming Interface

J2SE

Java

2

Platform,

Standard

Edition



Information Guide


Table of Contents Introduction................................................................................................................................... 6

Overview ....................................................................................................................................... 6

Configuration................................................................................................................................ 7

Minimum requirements for CLDC are ............................................................................. 7

Connected Device Configuration (CDC: .......................................................................... 8

Minimum requirements for CDC are................................................................................ 8

Profiles............................................................................................................................................ 8

Types of profiles are ............................................................................................................ 8

MIDP: Mobile Information Device Profile ....................................................................... 9

Foundation Profile............................................................................................................... 9

Personal Basis....................................................................................................................... 9

Personal Profile .................................................................................................................... 9

RMI Profile.......................................................................................................................... 10

Game Profile ....................................................................................................................... 10

Optional Packages...................................................................................................................... 10

Table of Figures Figure 1: Java ME Elements ........................................................................................................ 6



Information Guide


Introduction Nowadays communication has become indivisible part of our daily life. We are

dependent on mobiles, internet and other communication devices. So Java Micro Edition

(Java

ME)

provides

superfluity

opportunities

to

new

java

technologies.

Sun Microsystems created Java ME in 1999. It is mainly used on embedded and

handheld devices. Examples of Java ME are Personal Digital Assistants (PDAs), Mobiles,

TV set top boxes, Smart Cards, Personal Organizers etc. These devices have changed our

way of life.

Overview Java Micro Edition (Java ME) is a subset of Java 2 Platform, Standard Edition (J2SE) that

is geared towards embedded and handheld devices.

Java ME

Technology

consists

of

three

elements:

1. Configuration

2. Profiles

3. Optional Packages

Figure 1 shows the Java ME Elements:

Figure 1: Java ME Elements



Information Guide


Configuration Configuration is a set of Java Runtime classes, which executes Bytecode, provides Native

code to interface to the underlying system.

Java ME

defines

two

configurations:

‐ Connected Limited Device Configuration (CLDC)

‐ Connected Device Configuration (CDC)

Connected Limited Device Configuration (CLDC):

The CLDC specifies the basic set of core library and virtual machine (KVM). CLDC is

developed for resource‐constrained devices. It includes the basics from

the java.lang ,

java.io and

java.util

packages,

with

a few

additional

classes

from

the

new

javax.microedition.io package.

There are currently two versions of CLDC they are CLDC 1.0 and CLDC 1.1.

For more information, click on the following links:

CLDC 1.0: http://www.jcp.org/en/jsr/detail?id=30

CLDC 1.1: http://www.jcp.org/en/jsr/detail?id=139

Minimum requirements for CLDC are: 1. 128 kilobytes (minimum) memory for running Java

2. 32 kilobytes (minimum) memory for runtime memory allocation

3. Low power, typically battery powered

4. Network connectivity, typically wireless, with low bandwidth and

intermittent access









Information Guide


Connected Device Configuration (CDC): The CDC is used in devices having more memory than CLDC and includes almost full

Java VM and much larger set of core classes; CDC is in fact a superset of the CLDC.

Minimum requirements for CDC are: 1. 512 kilobytes (minimum) memory for running Java

2. 256 kilobytes (minimum) for runtime memory allocation

3. Network connectivity, possibly persistent and high bandwidth

Profiles: Profile

extends

configuration,

adding

domain

specific

classes.

Profile

adds

classes

that

aim

towards specific set of devices and add functionality missing from the configuration.

For example: Most profiles define user interface classes for building interactive applications.

Device should support minimum requirements of the underlying configuration and

requirements of the profile specification.

Types of profiles are: 1. Mobile Information Device Profile

2. Personal

Digital

Assistants

Profile

3. Foundation Profile

4. Personal Basis

5. Personal Profile

6. RMI Profile

7. Game Profile



Information Guide


MIDP: Mobile Information Device Profile MIDP is the basis for Wireless Java. So it is well known among Java ME profiles. MIDP

helps in storage facilities and limited display of cell phones. MIDP adds user interface

components, networking and local storage to CLDC.

Currently MIDP 1.0 (JSR 37) and MIDP 2.0 (JSR 118) are the two versions of MIDP.

For more information on MIDP 1.0 and MIDP 2.0, please refer to the following links:

MIDP 1.0: http://www.jcp.org/en/jsr/detail?id=37

MIDP 2.0: http://www.jcp.org/en/jsr/detail?id=118

PDA Profile PDA means Personal Digital Assistant. This is similar to MIDP. PDAs have more

memory and better screens compared to mobile handsets. PDAs can also be used in

classrooms for taking digital notes.

Foundation Profile This profile includes core Java 2 Version 1.3 core libraries. This profile is intended to be

used by devices requiring a complete implementation of the Java Virtual Machine up to

and including the entire Java Platform, Standard Edition API.

Personal Basis This profile is used in complex‐user interface platforms. This profile is used on devices

that have limited user interface capability. Personal Basis profile provides basic user

interface functionality to Foundation profile.

Personal Profile

Personal profile provides an environment for applications that requires Abstract

Window Toolkit (AWT) heavyweight components. It provides AWT support

comparable to JDK 1.1 and includes a number of more recent feature improvements

introduced by

the

Java

Platform,

Standard

Edition.

This

Profile

serves

as

a

suitable

platform for web applets and as a migration path for Personal Java applications.









Information Guide

RMI Profile This profile provides J2SE Remote Method Invocation libraries to the foundation profile.

It provides Java to Java remote method invocation environment for devices.

Game Profile This profile provides a platform for writing games software on CDC devices. It targets

high‐end consumer game devices and desktops.

Optional Packages Optional Packages are nothing but the bunch of Java Classes, which extend the core

platform. These Java classes can be packaged with configurations and profiles to create

software pack. Optional package has the functionality, which is independent of any

particular device family. It is a set of APIs that is most of the time layered on top of (and

thus extends)

a profile.

It

allows

the

definition

of

APIs,

which

can

add

flexibility

on

top

of other profiles.

Java ME supports number of optional packages. Some of them are listed below: ‐ Information Module Profile (IMP), JSR 195

‐ Wireless Messaging API (WMA), JSR 120, JSR 20

‐ Mobile Media API (MMAPI), JSR 135

‐ Location API for J2ME, JSR 179

‐ SIP API for J2ME, JSR 180

‐ Security and Trust Services API (SATSA) JSR 177

‐ Mobile 3D Graphics, JSR 184

‐ Web Services APIs (WSA), JSR 172

‐Bluetooth

API,

JSR

82

‐ RMI, JSR 66

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