[jira] [Updated] (WICKET-4655) Can a SpringBean's state be serialized?

["Shu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/WICKET-4655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shu updated WICKET-4655:
------------------------

    Description: 
I have Wicket page containing a SpringBean-injected object that contains state. This state is not serialized and hence not available when the user revisits the page via the Back button.

In the example below, the DAODataProvider object has an entityClass property. When the user goes back to the page via the Back button, the dataProvider and dataProvider.dao properties are available, but dataProvider.entityClass is null.

public class DemoPage extends WebPage {
	@Inject @SpringBean DAODataProvider dataProvider;
	
	public DemoPage(final PageParameters parameters) throws ClassNotFoundException, IntrospectionException {
    	super(parameters);
		
		dataProvider.setEntityClass(UserAccount.class);
		add(new CRUDPanel("panel", UserAccount.class, dataProvider));
    }

}


@Component
@Scope("request")
public class DAODataProvider extends SortableDataProvider {
	@Inject protected GeneralDAO dao;
	
	private Class<?> entityClass;
	
	public DAODataProvider() {
		super();
	}
}


The solution seems to be to do this:


public class DemoPage extends WebPage {
	@Inject @SpringBean DAODataProvider dataProvider;
	
	public DemoPage(final PageParameters parameters) throws ClassNotFoundException, IntrospectionException {
    	super(parameters);
		
		dataProvider.setEntityClass(UserAccount.class);
		add(new CRUDPanel("panel", UserAccount.class, dataProvider));
    }

	@Override
	protected void onBeforeRender()
	{
		dataProvider.setEntityClass(UserAccount.class);
		super.onBeforeRender();
	}

}

Is there a good way to indicate that a SpringBean-injected object should be bound to "page" scope, so that if the same page instance is deserialized the same dependency instance is looked up? 

  was:
I have Wicket page containing a SpringBean injected object that contains state. This state is not serialized and hence not available when the user revisits the page via the Back button.

In the example below, the DAODataProvider object has an entityClass property. When the user goes back to the page via the Back button, the dataProvider and dataProvider.dao properties are available, but dataProvider.entityClass is null.

public class DemoPage extends WebPage {
	@Inject @SpringBean DAODataProvider dataProvider;
	
	public DemoPage(final PageParameters parameters) throws ClassNotFoundException, IntrospectionException {
    	super(parameters);
		
		dataProvider.setEntityClass(UserAccount.class);
		add(new CRUDPanel("panel", UserAccount.class, dataProvider));
    }

}


@Component
@Scope("request")
public class DAODataProvider extends SortableDataProvider {
	@Inject protected GeneralDAO dao;
	
	private Class<?> entityClass;
	
	public DAODataProvider() {
		super();
	}
}


The solution seems to be to do this:


public class DemoPage extends WebPage {
	@Inject @SpringBean DAODataProvider dataProvider;
	
	public DemoPage(final PageParameters parameters) throws ClassNotFoundException, IntrospectionException {
    	super(parameters);
		
		dataProvider.setEntityClass(UserAccount.class);
		add(new CRUDPanel("panel", UserAccount.class, dataProvider));
    }

	@Override
	protected void onBeforeRender()
	{
		dataProvider.setEntityClass(UserAccount.class);
		super.onBeforeRender();
	}

}

Is there a good way to indicate that a SpringBean injected object should be bound to "page" scope?

    
> Can a SpringBean's state be serialized?
> ---------------------------------------
>
>                 Key: WICKET-4655
>                 URL: https://issues.apache.org/jira/browse/WICKET-4655
>             Project: Wicket
>          Issue Type: Improvement
>          Components: wicket-spring
>    Affects Versions: 1.5.7
>         Environment: Windows/Linux, JDK 6, Spring 3.1.0
>            Reporter: Shu
>
> I have Wicket page containing a SpringBean-injected object that contains state. This state is not serialized and hence not available when the user revisits the page via the Back button.
> In the example below, the DAODataProvider object has an entityClass property. When the user goes back to the page via the Back button, the dataProvider and dataProvider.dao properties are available, but dataProvider.entityClass is null.
> public class DemoPage extends WebPage {
> 	@Inject @SpringBean DAODataProvider dataProvider;
> 	
> 	public DemoPage(final PageParameters parameters) throws ClassNotFoundException, IntrospectionException {
>     	super(parameters);
> 		
> 		dataProvider.setEntityClass(UserAccount.class);
> 		add(new CRUDPanel("panel", UserAccount.class, dataProvider));
>     }
> }
> @Component
> @Scope("request")
> public class DAODataProvider extends SortableDataProvider {
> 	@Inject protected GeneralDAO dao;
> 	
> 	private Class<?> entityClass;
> 	
> 	public DAODataProvider() {
> 		super();
> 	}
> }
> The solution seems to be to do this:
> public class DemoPage extends WebPage {
> 	@Inject @SpringBean DAODataProvider dataProvider;
> 	
> 	public DemoPage(final PageParameters parameters) throws ClassNotFoundException, IntrospectionException {
>     	super(parameters);
> 		
> 		dataProvider.setEntityClass(UserAccount.class);
> 		add(new CRUDPanel("panel", UserAccount.class, dataProvider));
>     }
> 	@Override
> 	protected void onBeforeRender()
> 	{
> 		dataProvider.setEntityClass(UserAccount.class);
> 		super.onBeforeRender();
> 	}
> }
> Is there a good way to indicate that a SpringBean-injected object should be bound to "page" scope, so that if the same page instance is deserialized the same dependency instance is looked up? 

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