Migrating from wicket 1.2.X to 1.3 is not really hard if code has been well written (of course ). Something is quite annoying : model. Models are no longer aware of component using them. Here is a simple Abstract Class making model aware of component :

[Java] public abstract class AbstractComponentAwareModel implements IWrapModel, IComponentAssignedModel {    private Component component;    public abstract Object getObject();    public abstract void setObject(Object object);    public void detach() {}    /**     * @see org.apache.wicket.model.IWrapModel#getWrappedModel()     */    public IModel getWrappedModel()    {        return this;    }    /**     * @see org.apache.wicket.model.IComponentAssignedModel#wrapOnAssignment (org.apache.wicket.Component)     */    public IWrapModel wrapOnAssignment(Component component)    {        this.component = component;        return this;    }    protected Component getComponent()    {        return this.component;    } } 

Thx to Johan Compagner for the tip