Question:
I have a project on Eclipse, Wicket, Spring, Hibernate. Every thing works normaly except : when I try
public class SortableContactDataProvider extends SortableDataProvider<User> { @SpringBean private Service service; public Iterator<User> iterator(int first, int count) { //SortParam sp = getSort(); return service.findAllUsers().subList(0, 15).iterator(); } ... the service variable is null? In any another places when I use this constuction "service" is not null and working well. Please help me to solve this problem.
Solution:1
@SpringBean works only in any Subclass of Component.
You need to do the following in your Constructor
Wicket 1.4
InjectorHolder.getInjector().inject(this); Wicket 1.5+
org.apache.wicket.injection.Injector.get().inject(this); See 'generic IDataProvider implementation' @ http://stronglytypedblog.blogspot.com/2009/03/wicket-patterns-and-pitfalls-1.html
Enjoy
Solution:2
A bit more of context for those who are newbies to Wicket/Spring environment - as bert, pointed out, @SpringBean works only in any Subclass of Component so you'll need to drive the injection manually. This is a 2 step process:
Drive the injection in your class, something as:
public class SortableContactDataProvider extends SortableDataProvider<User> { @SpringBean private Service service; public SortableContactDataProvider(){ Injector.get().inject(this); // set up the injection } public Iterator<User> iterator(int first, int count) { return service.findAllUsers().subList(0, 15).iterator(); } } And make sure the Injector is set up in Wicket application - something like:
public WicketApplication @Override protected void init() { // make sure Spring injector is available and set up getComponentInstantiationListeners().add(new SpringComponentInjector(this)); } } Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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