Mac OS Runtime for Java: Difference between revisions

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|latest_release_date = April 8, 2004

|operating_system = [[classic Mac OS]]

|genre = [[Java Virtualvirtual Machinemachine]]

|license = Apple [[Software License Agreement|SLA]]

|website = [https://web.archive.org/web/20090408064838/http://docs.info.apple.com/article.html?artnum=120209 docs.info.apple.com via WayBack machine]

}}

'''Mac OS Runtime for Java''' ('''MRJ''', originally '''Macintosh Runtime for Java''') was [[Apple Inc.|Apple's]] proprietary [[Java Virtualvirtual Machinemachine|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.

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]].

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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>

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>{{citationcite web |title=Get Java for your Mac |url=https://support.apple.com/en-us/HT204036 |website=Apple Support needed|access-date=December8 2011April 2021}}</ref> As of Java 7, Apple has discontinued its own JRE, and Java support on OS X/macOS now comes directly from Oracle.

==Implementations==

* 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)

* Java 21.21.68 with Mac OS Runtime for Java v 2.2.6 [http://support.apple.com/kb/DL1184]

==References==

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