Provided that the key InstantiatingNullHandler.CREATE_NULL_OBJECTS is in the action context with a value of true (this key is set
only during the execution of the ParametersInterceptor), OGNL expressions
that have caused a NullPointerException will be temporarily stopped for evaluation while the system automatically
tries to solve the null references by automatically creating the object.
An Object to use within OGNL to proxy other Objects
usually Collections that you set in a different place
on the ValueStack but want to retain the context information
about where they previously were.
XWorkConverter is a singleton used by many of the WebWork's Ognl extention points,
such as InstantiatingNullHandler, XWorkListPropertyAccessor etc to do object
conversion.
Overrides the list property accessor so in the case of trying
to add properties of a given bean and the JavaBean is not present,
this class will create the necessary blank JavaBeans.