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4.12. Errors Reports

The Photo Album application has a global mechanism for errors checking. You become informed about the error each time it occurs. It is possible because the main page of the application web/src/main/webapp/index.xhtml includes the web/src/main/webapp/includes/misc/errorPanel.xhtml:

<a4j:outputPanel id="errors" ajaxRendered="true">
        <h:panelGroup rendered="#{errorHandlerBean.errorExist}">
            <rich:modalPanel id="errorPanel" showWhenRendered="true" minWidth="300" minHeight="200" autosized="true">

Here is the listing of the errorHandlerBean class:

package org.richfaces.photoalbum.ui;

import java.util.ArrayList;
import java.util.List;
import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.AutoCreate;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Observer;
import org.jboss.seam.annotations.Scope;
import org.richfaces.photoalbum.service.Constants;
public class ErrorHandlerBean {
    private List<String> errors = new ArrayList<String>();
    public List<String> getErrors() {
        return errors;
    public boolean isErrorExist(){
        return errors.size() > 0 ;
    public void addToErrors(String e){

The error panel contains the <a4j:outputPanel> component that is rendered on every Ajax request (ajaxRendered="true"). If an error is occurred the isErrorExist() method of errorHandlerBean class returns "true", so the <h:panelGroup> component is rendered. In order to show nested <rich:modalPanel> component with the collected errors the "showWhenRendered" attribute should be set to "true".

The addToErrors() method is annotated with @Observer annotation, thus it observes all events with ADD_ERROR_EVENT constant and adds errors to the errors List.