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{{Infobox software<br />
|name = Mac OS Runtime for Java<br />
|logo =<br />
|screenshot =<br />
|caption =<br />
|developer = [[Apple Inc.]]<br />
|latest_release_version = MRJ 2.2.6<br />
|latest_release_date = April 8, 2004<br />
|operating_system = [[classic Mac OS]]<br />
|genre = [[Java virtual machine]]<br />
|license = Apple [[Software License Agreement|SLA]]<br />
|website = [https://web.archive.org/web/20090408064838/http://docs.info.apple.com/article.html?artnum=120209 docs.info.apple.com via WayBack machine]<br />
}}<br />
<br />
'''Mac OS Runtime for Java''' ('''MRJ''', originally '''Macintosh Runtime for Java''') was [[Apple Inc.|Apple's]] proprietary [[Java virtual machine|virtual machine]] for [[Java (programming language)|Java-based]] applications in the [[classic Mac OS]] (i.e. versions prior to [[Mac OS X]]). Both a runtime environment and a [[software development kit]] (SDK) are available.<br />
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The runtime environment includes a [[Just-in-time compilation|JIT compiler]] developed by [[NortonLifeLock|Symantec]], the standard Java [[class library]] from [[Sun Microsystems|Sun]], additional classes providing Macintosh-specific functionality, and the Apple Applet Runner (a lightweight application for running Java [[applet]]s without the overhead of a [[web browser]]). A number of web browsers could use MRJ to run Java applets in web pages, including [[Microsoft]] [[Internet Explorer]], [[iCab]] and [[HotJava]].<br />
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The SDK includes [[porting|ports]] of most of the tools from Sun's [[Java Development Kit]] (in the form of [[Macintosh Programmer's Workshop|MPW]] tools and Macintosh applications), additional tools for packaging Java applications as double-clickable Macintosh applications, libraries for Macintosh-specific functionality, and documentation for the MRJ-specific classes and tools.<br />
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MRJ v2.2.5 was compatible with Sun's Java Development Kit version 1.1.8.<ref>{{cite news|last1=Cohen|first1=Peter|title=New Mac OS Runtime for Java available for Mac OS 9|url=https://www.macworld.com/article/1017775/mrj.html|accessdate=30 October 2017|work=PCWorld|date=1 June 2001}}</ref><br />
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Since the transition to Mac OS X, Apple has discontinued MRJ and instead maintains and distributes a port of [[Oracle Corporation|Oracle's]] [[HotSpot (virtual machine)|HotSpot]] Java virtual machine.<ref>{{cite web |title=Get Java for your Mac |url=https://support.apple.com/en-us/HT204036 |website=Apple Support |access-date=8 April 2021}}</ref> As of Java 7, Apple has discontinued its own JRE, and Java support on OS X/macOS now comes directly from Oracle.<br />
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==Implementations==<br />
* Java 1.0.2 with Mac OS Runtime for Java v 1.5.1 [http://support.apple.com/kb/TA38373?viewlocale=en_US] (starting with version 1.5, MRJ included a JIT compiler)<br />
* Java 1.1.8 with Mac OS Runtime for Java v 2.2.6 [http://support.apple.com/kb/DL1184]<br />
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==References==<br />
{{Reflist}}<br />
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==External links==<br />
* {{webarchive |url=https://web.archive.org/web/20090605145302/http://www.apple.com/macosx/features/java/ |date=June 5, 2009 |title=Apple.com - Java }}<br />
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{{Java Virtual Machine}}<br />
{{Portal|Computer programming}}<br />
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{{DEFAULTSORT:Mac Os Runtime For Java}}<br />
[[Category:Discontinued Java virtual machines]]<br />
[[Category:Classic Mac OS]]<br />
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