Recommendations for a heap analysis tool for Java?

Question

List your favorite heap analysis tools (e.g. jprofiler, jmap, ...). Let's keep it one tool per answer, with a short list of pros and cons for each tool.

Answer 1

YourKit : http://www.yourkit.com/

Pros:

• The interface is clean and it's fast
• It opened a large 5-gig heap dump where jProfiler grined to a halt. And it only needed 1-2 gigs of JVM ram to do so.

Cons: Of course... it's not free :(

Answer 2

Eclipse Memory analyzer http://www.eclipse.org/mat/

• Support for multiple JVMs
• Help with identifying sources for memory leaks (see http://www.sdn.sap.com/irj/scn/weblogs?blog=/pub/wlg/6856)
• Open source and actively developed by major vendors (SAP and IBM)
• Part of Galileo release of Eclipse

Answer 3

Java VisualVM, jvisualvm, included with the JDK. A pathologic Swing program is examined here.

Answer 4

BHeapSampler http://dr-brenschede.de/bheapsampler/

• generates a class-level heap-graph as a really intuitive display of the dominant memory structures
• can process really large heap dumps
• command-line tool, usable on server side without transfering the dump to the developer's desk