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2.2
 
Java 2 Platform, Micro Edition 
2.2.1
 
Connected Limited Device Configuration 
Connected Limited Device Configuration (CLDC) [3]is defined as a Java 2 Platform, 
Micro Edition (J2ME) [4] configuration and is intended to run on a wide variety of small 
devices. It targets application programming rather then systems programming.
The main component in a CLDC implementation is the Java Virtual Machine (JVM) 
which typically runs on top of a Host Operation System. On top of the JVM we find the 
Java libraries. A general goal for designing these libraries for the CLDC is to provide a 
minimum set of libraries for practical application development and a profile definition 
for a variety of small devices. 
An essential requirement for the CLDC is the ability to support dynamic downloading of 
Java applications and third-party content. It must also be able to support standard Java 
files in addition to be able to support compressed Java Archive (JAR) files. 
The security model of CLDC is defined at three different levels, which are: 
ƒ
Low-level security 
ƒ
Application security – a Java application can access only those libraries, 
system resources and components that a device and the Java application 
environment allows it to access 
ƒ
End-to-end security – guarantees that a transaction from one device to 
another is protected 
2.2.1.1
 
Generic Connection Framework 
One detail which makes designing the CLDC a problem is the various needs required by 
different devices. This led to the Generic Connection framework, which provides a 
coherent way to access various types of network in resource-constrained environment. 
The goal is to be a functional subset of Java 2 Platform Standard Edition(J2SE) 
[5]classes, which easily can be mapped to common low-level hardware or to any J2SE 
implementation with better extensibility, flexibility and coherence in supporting new 
devices and protocols.