Java - Weblogic - JMX : request available free memory on all servers

Once I get a JMX connection to my master weblogic server, how can I retrieve the current available free memory for each of my registered servers ?

I have requested the DomainRuntimeServiceMBean and listed all its attributes and operations, but开发者_开发技巧 I can not found anything related to memory.

(I'm using weblogic 9.x)

Weblogic 9 has the JVMRuntimeMBean documented here. You'll need to search for weblogic.management.runtime.JVMRuntimeMBean

The listed attributes are

•HeapFreeCurrent 
•HeapFreePercent 
•HeapSizeCurrent 
•HeapSizeMax 
•JavaVendor 
•JavaVersion 
•JavaVMVendor 
•Name 
•OSName 
•OSVersion 
•Parent 
•ThreadStackDump 
•Type 
•Uptime