All objects created by the framework are instantiated by the ObjectFactory. The ObjectFactory provides the means of integrating the framework with IoC containers like Spring, Pico, Plexus, and so forth.
Customize
Extend ObjectFactory
Customized ObjectFactory must extend ObjectFactory or any of its descendants and have a default, no-argument constructor.
To register a customized ObjectFactory, add or edit an entry in struts.properties
struts.objectFactory=foo.bar.MyCustomObjectFactory
where foo.bar.MyCustomObjectFactory is the custom object factory.
public class MyObjectFactory extends ObjectFactory { ..... }
Define dedicated builder
If you want to just extend one part of ObjectFactory, ie. change how Result Types are build, you can implement dedicated interface below and register it with dedicated name, see Extension Points for more details. All these builders are available as from version 2.3.16 when StrutsObjectFactory
or one of descendants is defined as struts.objectFactory
- basically this should work with default Struts 2 installation and with the Spring plugin as well.
List of Builder interfaces:
ResultBuilder
- dedicated interfaces used to build Result TypesStrutsResultBuilder
it's internal implementation which checks if Result implementsParamNameAwareResult
interface to restrict names of parameters set on the instance of Result, see Result Types for more info.