Any operating system running JRE 1.7 is affected, but the attack doesn’t work against JRE 1.6. That last one is the version that Mac users have installed (assuming they use Java at all).

MRJ 2.2.6 / April 8, 2004 Apple Website Mac OS Runtime for Java ( MRJ, originally Macintosh Runtime for Java) was proprietary for applications in the (i.e. Versions prior to ). Both a runtime environment and a (SDK) are available. The runtime environment includes a developed by, the standard Java from, additional classes providing Macintosh-specific functionality, and the Apple Applet Runner (a lightweight application for running Java without the overhead of a ). A number of web browsers could use MRJ to run Java applets in web pages, including,. The SDK includes of most of the tools from Sun's (in the form of 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.

MRJ v2.2.5 was compatible with Sun's Java Development Kit version 1.1.8. Since the transition to Mac OS X, Apple has discontinued MRJ and instead maintains and distributes a port of Java virtual machine. [ ] Implementations [ ] Java 1.0.2 with Mac OS Runtime for Java v 1.5.1 Java 2.2.6 with Mac OS Runtime for Java v 2.2.6 References [ ].

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