Fully featured low overhead profiler for Java EE and Java SE platforms.
Monitoring and profiling solution for Gradle, Maven, Ant, JUnit and TestNG.
Easy to use performance and memory profiler for .NET framework.

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.