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VMware’s August 2009 acquisition, Java Web development provider SpringSource, is busy making buys of its own.

SpringSource, which bought UK-based open messaging software maker Rabbit Technologies only a month ago, has acquired in-memory Java cache maker GemStone. Terms of the deal were not disclosed.

SpringSource’s Spring Framework provides a lightweight programming platform that makes applications portable across open-source and commercial application systems from IBM, Oracle, Dell, Hewlett-Packard, and others.