JMAPI stands for the JRockit Management API. This is a proprietary JVM management API, used to monitor the JVM and modify its behavior at run time. It was the very first JVM management API in existence, well before any standardization had taken place in this area. JMAPI was partially deprecated in JRockit R28 and will be phased out and replaced by JMXMAPI.
See also JMXMAPI.
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