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Sun Java 2 Platform, Micro Edition -- CDC
[Vendor: Sun Microsystems]

The Java 2 Platform, Micro Edition is the edition of the Java 2 platform targeted at consumer electronics and embedded devices. The J2ME technology consists of a virtual machine and a set of APIs suitable for providing tailored runtime environments for consumer and embedded electronics. The J2ME technology has two primary kinds of components -- configurations and profiles.

The Java 2 Platform, Micro Edition (J2ME) spans a broad array of consumer electronic and embedded devices. Typically, lower-end devices with constrained resources use the Connected, Limited Device Configuration (CLDC) technologies. Alternatively, higher-end devices use the Connected Device Configuration (CDC) and the CVM virtual machine.

Connected Device Configuration (CDC)

The Connected Device Configuration (CDC) is a Java Community Process effort (JSR-36) that has standardized a portable, Java building block for consumer electronic and embedded devices. The CDC configuration of J2ME provides for a virtual machine and set of core libraries appropriate for use with an industry-defined profile such as the Foundation profile.

The CDC standardization effort was the result of a collaboration of companies representing the consumer electronic industry. Target devices for CDC are characterized generally as follows:
  • Powered by a 32-bit processor
  • Two megabytes or more of total memory, including both RAM and flash or ROM, available for the
  • Java platform
  • Devices requiring the full feature functionality of the Java 2 "Blue Book" virtual machine
  • Connectivity to some kind of network, often with a wireless, intermittent connection and with limited (often 9600 bps or less) bandwidth
  • User interfaces with varying degrees of sophistication or even none
Residential gateways, emerging, next generation smartphones and communicators, two-way pagers, personal digital assistants (PDAs), organizers, home appliances, point-of-sale terminals, and car navigation systems are some of the devices that might be supported by CDC. Typically, these devices run a 32-bit microprocessor/controller and have more than 2.0MB of total memory for the storage of the virtual machine and libraries.

CDC contains the CVM virtual machine (CVM). CVM is a full-featured virtual machine designed for devices needing the functionality of the Java 2 virtual machine feature set, but with a smaller footprint.

For a complete J2ME application runtime environment, CDC uses the Foundation Profile, which is a set of Java APIs that provide functionality common to all target devices.

The CDC specification and the Foundation Profile specification have been developed through the Java Community Process (JCP) program by an expert group composed of companies representing the consumer electronics industry. For more information on the JCP.

The J2ME CDC implementation is a source code product that is provided for porting to various platforms. In order to ship this product commercially, a commercial use agreement must be entered into with Sun. As part of any commercial use agreement, it is necessary to pass compatibility tests that ensure we all benefit from a standardized Java application environment. The technology compatibility kit (TCK) for CDC can be licensed from Sun separately.

The above material is copyright 1994-2001 Sun Microsystems, Inc.


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