4.26. Instantiate an ArrayList Object Using a Static Factory Method

  1. Follow this example to instantiate an ArrayList object using a static factory method: 
    <jb:bean
   beanId="orders"
   class="java.util.List"
   factory="some.package.ListFactory#newList"
   createOnElement="orders"
>
     <!-- ... bindings -->
</jb:bean>
    The some.package.ListFactory#newList factory definition establishes that the newList method must be called on the some.package.ListFactory class in order to create the bean. The class attributes define the bean as a List object. The specific kind of List object that it is (be it an ArrayList or a LinkedList), is decided by the ListFactory itself.
  2. Observe this additional example: 
    <jb:bean
   beanId="orders"
   class="java.util.List"
   factory="some.package.ListFactory#getInstance.newList"
   createOnElement="orders"
>
     <!-- ... bindings -->
</jb:bean>
    This defines that an instance of the ListFactory needs to be retrieved using the static method getInstance and then the newList method needs to be called on the ListFactory object to create the List object. This construct lets you use singleton factories.