java - jboss 7 cpu monitoring -

i want monitor ""jboss 7 as"" cpu usage memory not cpu usage time, can using jmx ? when write function, cpu time, not cpu memory...

public string getcpuusage(){     try {         method m=op.getclass().getdeclaredmethod("getprocesscputime");         m.setaccessible(true);         object value=null;         value=m.invoke(op);         return value+"";     } catch (securityexception e) {         // todo auto-generated catch block         e.printstacktrace();     } catch (nosuchmethodexception e) {         // todo auto-generated catch block         e.printstacktrace();     } catch (illegalargumentexception e) {         // todo auto-generated catch block         e.printstacktrace();     } catch (illegalaccessexception e) {         // todo auto-generated catch block         e.printstacktrace();     } catch (invocationtargetexception e) {         // todo auto-generated catch block         e.printstacktrace();     }     return null; }