An Oracle blog about NetBeans Profiler

New Plugin for VisualVM - Buffer Monitor

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Buffer Monitor Plugin monitors the resources associated with pools of buffers. Plugin can monitor direct buffers that are allocated outside of the garbage-collected heap
(by ByteBuffer.allocateDirect),
and memory-mapped buffers, created by mapping a region of a file into memory (using
FileChannel.map). The plugin uses newly added
java.nio.BufferPoolMXBean to monitor the buffers usage. BufferPoolMXBean is available only in JDK 7 (build 36 and newer), so if you want to use this plugin, your monitored application must run on the latest JDK 7 build available here. More details about buffer pools monitoring are available in
Alan Bateman's blog. The plugin is available at VisualVM 1.1.1 plugin center.

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