Collapsing of LinkedList$Entry chain is broken in heap dumps taken from JDK 7 or newer. This regression was introduced by JDK bug #6897553 : LinkedList performance improvements.
Fixed in profiler-main
user: Tomas Hurka <email@example.com>
date: Wed Oct 31 16:23:28 2012 +0100
summary: bugfix #221132, handle LinkedList$Node introduced in JDK7
Integrated into 'main-golden', will be available in build *201211010001* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress)
User: Tomas Hurka <firstname.lastname@example.org>
Log: bugfix #221132, handle LinkedList$Node introduced in JDK7