Connections to the server machine require credentials: user name, password, and host name (or IP address). The following code connects to the server and extracts information useful for manipulating a service:

Procedure
1

Create the service instance moRef: 

ManagedObjectReference svcRef = new ManagedObjectReference();
svcRef.setType("ServiceInstance");
svcRef.setValue("ServiceInstance");
2

Locate the service: 

VimServiceLocator locator = new VimServiceLocator();
locator.setMaintainSession(true);
VimPortType serviceConnection = locator.getVimPort("https://your_server/sdk");
3

Log in to the session manager: 

ServiceInstanceContent serviceContent = serviceConnection.retrieveContent(svcRef);
ManagedObjectReference sessionManager = serviceInstance.getSessionManager();
UserSession us = serviceConnection.login(sessionManager, username, password, null);