Dynamically add AjaxBehavior throws NullPointerException

[fuinhaazulgit]

Hi there!

I´m trying to add some ajax listeners using mojarra (tested with 2.2 and 2.3) and i receive a NullPointerException.
Using Myfaces everything works fine.

Exception:

java.lang.NullPointerException
	at javax.faces.component.UIComponentBase.restoreBehaviors(UIComponentBase.java:2228)
	at javax.faces.component.UIComponentBase.restoreBehaviorsState(UIComponentBase.java:2203)
	at javax.faces.component.UIComponentBase.restoreState(UIComponentBase.java:1623)
	at javax.faces.component.UIOutput.restoreState(UIOutput.java:286)
	at javax.faces.component.UIInput.restoreState(UIInput.java:1422)
	at com.sun.faces.application.view.FaceletPartialStateManagementStrategy$2.visit(FaceletPartialStateManagementStrategy.java:379)
	at com.sun.faces.component.visit.FullVisitContext.invokeVisitCallback(FullVisitContext.java:151)
	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1689)
	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
	at javax.faces.component.UIForm.visitTree(UIForm.java:371)
	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
	at com.sun.faces.application.view.FaceletPartialStateManagementStrategy.restoreView(FaceletPartialStateManagementStrategy.java:366)
	at com.sun.faces.application.StateManagerImpl.restoreView(StateManagerImpl.java:138)
	at com.sun.faces.application.view.ViewHandlingStrategy.restoreView(ViewHandlingStrategy.java:123)
	at com.sun.faces.application.view.FaceletViewHandlingStrategy.restoreView(FaceletViewHandlingStrategy.java:591)
	at com.sun.faces.application.view.MultiViewHandler.restoreView(MultiViewHandler.java:151)
	at javax.faces.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper.java:353)
	at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:199)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
	at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:123)
	at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:658)
....

Code:

<p:inputText id="txtTeste" value="#{user.desTeste}">
	<p:ajax
		event="change"
		listener="#{user.listener}" />
</p:inputText>

<p:commandButton
	action="#{user.actionCustomizar}"
	value="Adiciona"
	ajax="false" />


public void actionCustomizar() {
		ExpressionFactory factory = FacesContext.getCurrentInstance().getApplication().getExpressionFactory();
		ELContext elContext = FacesContext.getCurrentInstance().getELContext();
		MethodExpression me = factory.createMethodExpression(elContext, "#{user.listenerKeyUp}", null, new Class<?>[] { BehaviorEvent.class });

		AjaxBehavior ajaxBehavior = (AjaxBehavior) FacesContext.getCurrentInstance().getApplication().createBehavior(AjaxBehavior.BEHAVIOR_ID);
		ajaxBehavior.setProcess("@this");
		ajaxBehavior.addAjaxBehaviorListener(new AjaxBehaviorListenerImpl(me, me));
		ajaxBehavior.setUpdate("@this");
		InputText c = (InputText) this.findComponent("txtTeste");
		c.addClientBehavior("keyup", ajaxBehavior);
}

And yes, AjaxBehavior is a primefaces class, but using myfaces this code works, so after a lot of tries my conclusion is that there is a bug on this scenario.

Tested with a lot of different servers (tomee, wildfly 10, 11 and 12) and the result is always the same (on mojarra the code doesnt work)

Any help will be appreciated.

[fuinhaazulgit]

Just to add:

Same problem seems to happen with other people:

https://stackoverflow.com/questions/41424132/not-able-to-add-new-ajax-behavior-to-primefaces-datatable-dynamically-when-it-al