Using JNDI to connect toWeblogic Managed Server

Hi,I have a weblogic 12c testsystem with an AdminServer and a Managed Server. I want do read out some Mbeans with a little Java-Programm (Name, State, HeapSize, CPU usage and so on). It worked fine with usage of DomainRuntimeServiceMBean (as you can see in the Code below). But when the AdminServer is down, I have no function. I can't read out the Mbeans of the running Managed Server. I seems there is a solution with usage of Weblogic JNDI, but I don't know how it works. I read the instructions of the following link

http://docs.oracle.com/cd/E13222_01/wls/docs81/jndi/jndi.html