How does an application that uses Spring's SimpleNamingContextBuilder know to search its directory for resources?

How does an application that uses Spring's SimpleNamingContextBuilder as its JNDI provider know to search its directory for resources? What links the application to the Spring naming directory? For example, how does the JndiObjectFactoryBean bean in this earlier answer know to find resource my-db in the Spring directory? Doesn't JndiObjectFactoryBean require a context environment with property java.naming.factory.initial set to some implementation of interface InitialContextFactory? What should the value of java.naming.factory.initial be when using SimpleNamingContextBuilder as the JNDI provider?