Eclipse Memory Analyser Tool
http://help.eclipse.org/mars/index.jsp?topic=/org.eclipse.mat.ui.help/welcome.html
http://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=388793187
Download:
http://www.eclipse.org/mat/downloads.php
Jconsole
http://www.herongyang.com/Java-Tools/jconsole-Java-Monitoring-Management-Console.html