public class ExceptionWrapper extends ExceptionHandlerWrapper{ private ExceptionHandler wrapper; private IManagedBean bean; public ExceptionWrapper(ExceptionHandler wrapper) { this.wrapper=wrapper; bean=(IManagedBean) FacesContextUtils.getWebApplicationContext(FacesContext.getCurrentInstance()).getBean("managedBean"); } @Override public ExceptionHandler getWrapped() { return wrapper; } @Override public void handle() throws FacesException { Iterator<ExceptionQueuedEvent> i=getUnhandledExceptionQueuedEvents().iterator(); while(i.hasNext()) { ExceptionQueuedEvent evt=i.next(); ExceptionQueuedEventContext context = (ExceptionQueuedEventContext) evt.getSource(); Throwable t=context.getException(); try{ String msgDetail=t.getMessage(); String msgSummary=t.getCause().getMessage(); bean.addError(msgDetail, msgSummary); } finally { i.remove(); } } getWrapped().handle(); } }
Luego el factory
public class ExceptionFactory extends ExceptionHandlerFactory{ private ExceptionHandlerFactory parent; public ExceptionFactory(ExceptionHandlerFactory parent) { this.parent=parent; } @Override public ExceptionHandler getExceptionHandler() { ExceptionHandler result=new ExceptionWrapper(parent.getExceptionHandler()); return result; } }
Ahora hay que registrar el exception factory en el faces-config.xml
<factory> <exception-handler-factory> org.dani.ejemplo.caught.ExceptionFactory </exception-handler-factory> </factory>
Mi bean que implementa la funcionalidad para enviar los mensajes al contexto de la aplicacion sera asi:
public class ManagedBeanImpl implements IManagedBean{ protected FacesContext getCurrentContext() { return FacesContext.getCurrentInstance(); } private void addMessage(String detail,String summary,Severity severity) { getCurrentContext().addMessage(null, new FacesMessage(severity, summary, detail)); } public void addInfo(String detail, String summary) { addMessage(detail, summary, FacesMessage.SEVERITY_INFO); } public void addError(String detail, String summary) { addMessage(detail, summary, FacesMessage.SEVERITY_ERROR); } }
No explicare como configurar el bean anterior con spring ya que para ello ya he abordado el tema bastante.
Mi managed bean quedara de la siguiente manera
@ManagedBean @ViewScoped public class ViewBean extends ManagedBeanImpl{ private String requiredField; public String doGenericError() { int n=1/0; System.out.println(n); return null; } public String doOk() { if (!requiredField.equals("123")) throw new MyCustomException("Valor incorrecto"); String success="Valor correcto"; addInfo(success, success); return null; } public String getRequiredField() { return requiredField; } public void setRequiredField(String requiredField) { this.requiredField = requiredField; } }
La plantilla la defino de la siguiente manera
<h:body> <h:form> <p:growl id="messages" /> <ui:insert name="body"/> </h:form> </h:body> Y la pagina implementando la plantilla
<ui:composition template="./template.xhtml"> <ui:define name="body"> <h:panelGrid columns="2"> <h:outputText value="Campo requerido"/> <p:inputText label="Campo" value="#{viewBean.requiredField}" required="true"/> <p:commandButton value="Aceptar" action="#{viewBean.doOk}" update="messages"/> <p:commandButton value="Genera Error" update="messages" process="@this" action="#{viewBean.doGenericError}"/> </h:panelGrid> </ui:define> </ui:composition>
El resultado seria así



Adjunto codigo fuente para efectos de estudio.

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