VisualVM - not a valid core dump

Question

I have .hprof heap dump generated from JVM OutOfMemory (JDK 1.5 version).

When I try to add this file in VisualVM, it tells me file is not a valid core dump.

However from I'm able to run jhat for this dump file without any issue.

any ideas why ?

Answer 1

The file you are trying to open is a Head Dump not a Core Dump.

Follow this steps:

1. Go to File > Load...
2. Select the File Format: as Heap Dumps (*.hprof, *.*)
3. Choose your file and click on Open.

Answer 2

Heap dump is not a core dump. So you have to open your .hprof file as a heap dump in VisualVM.