MIB manager MBeans manage the underlying MIBs. This means that there is one for the NETWORK-SERVICES MIB, and one for the J2EE MIB. The MIB manager MBeans:
Register the object identifier (OID) sub-tree that is associated with the MIB
Create the tables defined in the MIB, and populate them with the appropriate rows
Provide support for rebuilding the tables when required
Listen for JMX events and map them to SNMP traps
