Fully featured low overhead profiler for Java EE
and Java SE platforms.
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Easy to use performance and memory profiler for .NET framework.
Supports ASP.NET, Silverlight, .NET Windows services and more.
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Class loaders

"Class loaders" view shows objects grouped by class loader

For each loader, the number of loaded classes is shown, as well as the number of classes without instances; this information can help in finding leaked loaders.

Paths from GC roots to the loader object are explicitly available as a slave view "Paths to Loader". This allows you to learn why particular loader is retained in memory.