public final class AttributeMarker
extends java.lang.RuntimeException
AttributeMarker class can be declared in the
throws clause of a getter method to indicate to
the marshalling code that a particular persistent property
should be persisted in XML as an attribute instead of an element.
In order for this to succeed, the type of the property must be
directly convertible to and from a String form.
Java's ability to annotate methods with metadata at compile-time
is very limited. BeanInfo classes tend to be cumbersome and the
information in the BeanInfo class can often be overlooked since
the BeanInfo code is usually in a separate file and sometimes
even in a separate package. By using a "marker exception" in
the throws clause of the getter, the fact that the getter
represents an XML attribute is readily apparent, especially once
the purpose of AttributeMarker is understood.