Editing Connected Device Configuration

{{Short description|Java ME application framework}}
The '''Connected Device Configuration''' ('''CDC''') is a specification of a [[Software framework|framework]] for [[Java ME]] applications describing the basic set of libraries and virtual-machine features that must be present in an implementation. The CDC is combined with one or more profiles to give developers a platform for building applications on embedded devices ranging from [[pager]]s up to [[set-top box]]es.<ref name="java.sun.com">CDC Overview http://java.sun.com/javame/technology/cdc/overview.jsp {{Webarchive|url=https://web.archive.org/web/20090608140537/http://java.sun.com/javame/technology/cdc/overview.jsp |date=2009-06-08 }}</ref> The CDC was developed under the [[Java Community Process]] as [[Java Specification Request|JSR]] 36<ref name="jsr36">JSR 36, CDC 1.0.2 http://www.jcp.org/en/jsr/detail?id=36 {{Webarchive|url=https://web.archive.org/web/20201031222255/http://www.jcp.org/en/jsr/detail?id=36 |date=2020-10-31 }}</ref> (CDC 1.0.2) and JSR 218<ref name="jsr218">JSR 218, CDC 1.1.2 http://www.jcp.org/en/jsr/detail?id=218 {{Webarchive|url=https://web.archive.org/web/20200923194838/http://www.jcp.org/en/jsr/detail?id=218 |date=2020-09-23 }}</ref> (CDC 1.1.2).

==Typical requirements==
Devices that support CDC typically include a 32-[[bit]] [[Central processing unit|CPU]] with about 2&nbsp;[[megabyte|MB]] of [[Random Access Memory|RAM]], and 2.5&nbsp;MB of [[Read-only memory|ROM]] available for the Java application environment. The reference implementations for CDC profiles are based on [[Linux]] running on an [[Intel]]-compatible PC, and optimized implementations are available for a variety of other CPUs and operating systems.<ref name="java.sun.com"/>

==Profiles==
A profile is a set of APIs that support devices with different capabilities and resources within the CDC framework to provide a complete Java application environment. Three profiles are available, which build on each other incrementally and allow application developers to choose the appropriate programming model for a particular device.

===Foundation Profile===
This is the most basic of the CDC family of profiles. '''Foundation Profile''' is a set of Java APIs tuned for low-footprint devices that have limited resources that do not need a graphical user interface system.<ref>Foundation Profile Overview http://java.sun.com/products/foundation/overview.html {{Webarchive|url=https://web.archive.org/web/20090727145114/http://java.sun.com/products/foundation/overview.html |date=2009-07-27 }}</ref> It provides a complete Java ME application environment for consumer products and embedded devices but without a standards-based GUI system. Version 1.1.2 is specified in JSR 219<ref name="jsr219">JSR 219, Foundation Profile Specification http://www.jcp.org/en/jsr/detail?id=219 {{Webarchive|url=https://web.archive.org/web/20100612201855/http://jcp.org/en/jsr/detail?id=219 |date=2010-06-12 }}</ref> and implements a subset of [[Java SE]] 1.4.2, including a set of security-related optional packages, such as Java Authentication and Authorization Service ([[Java_Authentication_and_Authorization_Service|JAAS]]), Java Secure Socket Extension ([[Java_Secure_Socket_Extension|JSSE]]), and Java Cryptography Extension ([[Java_Cryptography_Extension|JCE]]).

===Personal Basis Profile===
The '''Personal Basis Profile''' provides a superset of the '''Foundation Profile''' APIs and supports a similar set of devices, with lightweight graphical user interface requirements.<ref>Personal Basis Profile Overview http://java.sun.com/products/personalbasis/overview.html {{Webarchive|url=https://web.archive.org/web/20090727145129/http://java.sun.com/products/personalbasis/overview.html |date=2009-07-27 }}</ref> A framework for building lightweight graphical user interface components is provided with support for some [[Abstract Window Toolkit|AWT]] classes. There are no heavyweight GUI components provided because these components assume the availability of a pointing device such as a mouse. The specification is described in JSR 217<ref name="jsr217">JSR 217, Personal Basis Profile Specification http://www.jcp.org/en/jsr/detail?id=217 {{Webarchive|url=https://web.archive.org/web/20091125024150/http://jcp.org/en/jsr/detail?id=217 |date=2009-11-25 }}</ref> and is used for products that require a standards-based graphical user interface but without full AWT compatibility. The [[Xlet]] application programming model is used for application development within this profile, including advanced content on [[Blu-ray]] discs conforming to the [[BD-J]] specification.

===Personal Profile===
The '''Personal Profile''' extends the '''Personal Basis Profile''' with a GUI toolkit based on AWT.<ref>Personal Profile Overview http://java.sun.com/products/personalprofile/overview.html {{Webarchive|url=https://web.archive.org/web/20090912003436/http://java.sun.com/products/personalprofile/overview.html |date=2009-09-12 }}</ref> It provides a complete Java ME application environment with full AWT support and is intended for higher end devices, such as PDAs, smart communicators, set-top boxes, game consoles, automobile dashboard electronics, and so on.<ref>J2ME FAQ, Writing an application for the J2ME Personal Profile http://developers.sun.com/mobility/personal/questions/gui/ {{Webarchive|url=https://web.archive.org/web/20090225101018/http://developers.sun.com/mobility/personal/questions/gui/ |date=2009-02-25 }}</ref> This is the recommended profile for porting of legacy [[PersonalJava]]-based applications. The specification is described in JSR 62<ref name="jsr62">JSR 62, Personal Profile Specification http://www.jcp.org/en/jsr/detail?id=62 {{Webarchive|url=https://web.archive.org/web/20100610102343/http://jcp.org/en/jsr/detail?id=62 |date=2010-06-10 }}</ref> and uses the [[Applet]] programming model for application development.

==Optional Packages==
CDC supports a number of optional packages that allow developers to access specific pieces of extra functionality within the restricted resource constraints of a Java ME device.
* The [[Java remote method invocation|RMI]] Optional Package provides a subset of Java SE RMI for distributed-application and network communication.
* The [[JDBC]] Optional Package provides a subset of the JDBC 3.0 API for accessing data sources, including spreadsheets, flat files and relational databases.

==See also==
*[[Connected Limited Device Configuration]] or ''CLDC'', another framework for building Java ME applications

==References==
{{Reflist}}

==External links==
*[http://www.oracle.com/technetwork/java/javame/tech/index-jsp-139293.html CDC home page]

[[Category:Java device platform]]
[[Category:Java specification requests]]