Implementation of DynaBean that wraps a standard JavaBean
instance, so that DynaBean APIs can be used to access its properties.
The most common use cases for this class involve wrapping an existing java bean.
(This makes it different from the typical use cases for other DynaBean's.)
Object aJavaBean = ...;
DynaBean db = new WrapDynaBean(aJavaBean);
IMPLEMENTATION NOTE - This implementation does not
support the contains() and remove() methods.