Executing the ActionListener of a (Primefaces) menu item leads to an IllegalStateException
In JSF backed bean I got an IllegalStateException when the programmatically added action listener of a programmatically added Primefaces menu item is called. I tried both request and session scope but both are leading to the same error. Obviously there's need -- according to the stack trace -- to restore the view when an action listener is executed and I let my ToolbarBean implement Serializable with no different effect. What should I consider in order to get this to work?
User interface definition
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:p="http://primefaces.prime.com.tr/ui">
<h:head>
<title>TITLE</title>
</h:head>
<h:body>
<h:form>
<p:menu model="#{toolbarBean.model}" type="tiered" />
</h:form>
</h:body>
</html>
Backed bean providing the menu
@Named
@Scope("request")
public class ToolbarBean implements Serializable {
private static final long serialVersionUID = -8556751897482662530L;
public ToolbarBean() {
model = new DefaultMenuModel();
MenuItem item;
// Direct menu item
item = new MenuItem();
item.setValue("Menuitem 1");
item.addActionListener(new ActionListener() {
@Override
public void processAction(ActionEvent event)
throws AbortProcessingException {
System.out.println(event.toString());
}
});
model.addMenuItem(item);
item = new MenuItem();
item.setValue("Menuitem 2");
item.addActionListener(new ActionListener() {
@Override
public void processAction(ActionEvent event)
throws AbortProcessingException {
System.out.println(event.toString());
}
});
model.addMenuItem(item);
}
private MenuModel model;
public MenuModel getModel() {
return model;
}
}
Exception when clicking one of the menu buttons
javax.faces.FacesException: java.lang.IllegalStateException: java.lang.InstantiationException: id.co.sofcograha.baseui.ToolbarBean$1
at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:1284)
at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:673)
at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:1290)
at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:673)
at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:1290)
at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:673)
at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:1290)
at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:673)
at com.sun.faces.application.view.StateManagementStrategyImpl.restoreView(StateManagementStrategyImpl.java:297)
at com.sun.faces.application.StateManagerImpl.restoreView(StateManagerImpl.java:177)
at com.sun.faces.application.view.ViewHandlingStrategy.restoreView(ViewHandlingStrategy.java:119)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.restoreView(FaceletViewHandlingStrategy.java:438)
at com.sun.faces.application.view.MultiViewHandler.restoreView(MultiViewHandler.java:144)
at javax.faces.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper.java:284)
at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:182)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:107)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:308)
Answer
EL (read: reflection) cannot access/construct anonymous classes. Refactor them into fullworthy classes.
So, replace
item.addActionListener(new ActionListener() {
@Override
public void processAction(ActionEvent event)
throws AbortProcessingException {
System.out.println(event.toString());
}
});
by
item.addActionListener(new FooActionListener());
and
public class FooActionListener implements ActionListener {
@Override
public void processAction(ActionEvent event)
throws AbortProcessingException {
System.out.println(event.toString());
}
}