|
'''Java TV''' is thea [[Java (Sun)|Java]]-based [[software framework]] useddesigned for ause on TV [[set-top box]]es, forbased which theon runningcomponents ofcalled [[Xlet]]s. It currently is deployedcurrently used only on the [[Connected Device Configuration]], specifically for [[Interactive_televisionInteractive television|iTV]] applications development.
The API includes the Xlet classes in the package javax.tv.xlet . Other packages of the public API include
# javax.tv.graphics - provides a simple rendering canvas
# javax.tv.locator - provideprovides a locator in the style of a [[URL]] for services and media, such as service:/SERV1
# javax.tv.service - definedefines a mechanism for service information (SI) databasedatabases and APIs representing the SI elements;, whichsuch amountsas tothe TV channelchannels and media available for playback.
Sun currently provides supports Java TV only on [[Java Platform, Micro Edition]]. The framework is quite general but for some subjects, such as locators, it is in effect superseded by other locator standards on platforms such as [[BD-J]].
<ref>[http://java.sun.com/javame/technology/javatv/ Java ME Technology - Java TV API] - includes Sun's Reference Implementation</ref><ref>[http://java.sun.com/javame/reference/apis/jsr927/ Java TV API 1.1 (JSR-927) online Javadocs]</ref><ref>[http://www.mhp-interactive.org/tutorials/javatv/ The JavaTV tutorial]</ref>
==Criticisms==
While the framework is general, Sun currently provides support only on [[Java Platform, Micro EditionME]]. For some subjects, such as media locators, it is in effect superseded by other locator standards on platforms such as [[BD-J]].
A point of confusion is that in platforms supported as of 2008, examples such as the SvcDispXlet example infrom thisthe introduction to Javathe TVAPI, written circa 2001, are still not deployable because it uses [[Abstract Window Toolkit|AWT]] widgets such as [http://java.awtsun.com/javase/6/docs/api/java/awt/Button.html java.awt.Button]. Most suchiTV platforms, andalong with BD-J, implement Personal Basis Profile with no AWT widgets, as opposed to Personal Profile which includes the widgets.<ref>[http://java.sun.com/developer/technicalArticles/javatv/apiintro/ Introduction to Digital TV Applications Programming] By Monica Pawlan, February 2001 </ref>
Sun's reference implementation for Java TV attempts to limit its exposure to support issues to the full [[Java Media Framework]] by having its own small version of JMF that itis internally referred to as "jmflite". As with the limitations of the [[MIDP]] emulators that Sun provides, the [[Java TV ]] reference implementation provideprovided by Sun has not been updated to make provisions for later JDK's such as removing calls to Thread.stop() such as in the jmflist com.sun.tv.media.util.MediaThread class. The Thread.stop() method was made a "final" method in Java 1.5 (meaning that classes which extend Thread and override stop() will fail at runtime in aunder JRE 1.5 -when more specifically atthe class loadis time with a java.lang.VerifyErrorloaded). This implies that Sun has not yet committed to public plans or a roadmap for the notion thattaking Java ME will ever go beyond JRE 1.3. ToIf besuch fair, if thean upgrade of Java MEwere to JDK 1.5 or 1.6 evertake happensplace, it willwould require somesignificant work on the part of all vendors of Java ME-enabled devices.<ref>[http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Thread.html#stop() JRE 1.5 Thread.stop() javadoc]</ref><ref>[http://java.sun.com/j2se/1.5.0/docs/guide/misc/threadPrimitiveDeprecation.html Why Are Thread.stop, Thread.suspend, Thread.resume and Runtime.runFinalizersOnExit Deprecated?]</ref> ▼
==See also==
{{Portal|Computer programming}}
*[[Xlet]]
==External links==
▲Sun's reference implementation for Java TV attempts to limit its exposure to support issues to the full [[Java Media Framework]] by having its own small version of JMF that it internally referred to as "jmflite". As with the limitations of the [[MIDP]] emulators that Sun provides, the [[Java TV]] reference implementation provide by Sun has not been updated to make provisions for later JDK's such as removing calls to Thread.stop() such as in the jmflist com.sun.tv.media.util.MediaThread class. The Thread.stop() method was made a "final" method in Java 1.5 (meaning that classes which extend Thread and override stop() will fail at runtime in a JRE 1.5 - more specifically at class load time with a java.lang.VerifyError). This implies that Sun has not yet committed to public plans or a roadmap for the notion that Java ME will ever go beyond JRE 1.3. To be fair, if the upgrade of Java ME to JDK 1.5 or 1.6 ever happens, it will require some work on the part of all vendors of Java ME-enabled devices.<ref>[http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Thread.html#stop() JRE 1.5 Thread.stop() javadoc]</ref><ref>[http://java.sun.com/j2se/1.5.0/docs/guide/misc/threadPrimitiveDeprecation.html Why Are Thread.stop, Thread.suspend, Thread.resume and Runtime.runFinalizersOnExit Deprecated?]</ref>
* [http://java.sun.com/javame/technology/javatv/ Java ME Technology - Java TV API] - includes Sun's Reference Implementation
* [http://java.sun.com/javame/reference/apis/jsr927/ Java TV API 1.1 (JSR-927) online Javadocs]
* [http://www.mhp-interactive.org/tutorials/javatv/ The JavaTV tutorial]
==NotesReferences==
{{reflist}}
{{Java (Sun)}}
{{software-stub}}
{{tv-tech-stub}}
[[Category:Java programming language]] ▼
[[Category:Interactive television]]
[[pt:JavaTV]]
▲[[Category:Java (programming language )]]
[[Category:Java device platform]]
[[Category:Set-top box]]
| 