Return an instance object implementing BeanFactoryLocator. This will normally
be a singleton instance of the specific ContextSingletonBeanFactoryLocator class,
using the default resource selector.
Return an instance object implementing BeanFactoryLocator. This will normally
be a singleton instance of the specific ContextSingletonBeanFactoryLocator class,
using the specified resource selector.
Parameters: selector - a selector variable which provides a hint to the factory as towhich instance to return.