Fully featured low overhead profiler for Java EE and Java SE platforms.
Performance monitoring and profiling of Jenkins, TeamCity, 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 dependent "Paths from GC Roots" view . This allows you to learn why particular loader is retained in memory.