Old HPROF: Heap and CPU Profiling Agent (-agentlib:hprof) allows to create heap dump file, which contains several independent heap dumps in hprof format. Even though hprof agent is not used these days, it would be nice to have a rudimentary support for displaying those heap dumps in heap viewer UI. Currently only first heap dump is displayed if such file is opened in VisualVM.
Note that there is already support for reading such multi-heap dumps in by VisualVM hprof library.