...

this.stubFactory = createApiStubFactory(server, httpConfig);

// Create a security context for username/password authentication
SecurityContext securityContext =
        SecurityContextFactory.createUserPassSecurityContext(
            username, password.toCharArray());

// Create a stub configuration with username/password security context
StubConfiguration stubConfig = new StubConfiguration(securityContext);

// Create a session stub using the stub configuration.
Session session =
        this.stubFactory.createStub(Session.class, stubConfig);

// Login and create a session
char[] sessionId = session.create();

// Initialize a session security context from the generated session id
SessionSecurityContext sessionSecurityContext =
        new SessionSecurityContext(sessionId);

// Update the stub configuration to use the session id
stubConfig.setSecurityContext(sessionSecurityContext);

/*
 * Create a stub for the session service using the authenticated
 * session
 */
this.sessionSvc =
        this.stubFactory.createStub(Session.class, stubConfig);

VM vmService = this.stubFactory.createStub(VM.class, stubConfig);