GC roots

1：GC roots

http://www.yourkit.com/docs/11/help/gc_roots.jsp

2：Garbage collection roots

http://publib.boulder.ibm.com/infocenter/hctool/v1r0/index.jsp?topic=%2Fcom.ibm.java.diagnostics.memory.analyzer.doc%2Fgcroots.html

特别注意点包括java local

Java local

A local variable. For example, input parameters, or locally created objects of methods that are still in the stack of a thread.