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J9 is the Java Virtual Machine developed by IBM. The J9 VM is the basis of multiple IBM Java offerings, including Websphere Micro Edition, as well as the basis of all IBM Java Development kit since version 5. IBM has also made the J9 VM available to the Apache Harmony project for use in running their class libraries.
The design of the J9 VM has been aimed at portability to different platforms, as well as scaling from the mobile phones all the way to zSeries mainframe.
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