Geek Answers Handbook

Do Not Redirect Exception Errors

I am trying to go to the error page if an exception occurs. For this, I defined:

<error-page> <error-code>500</error-code> <location>/error.jspx</location> </error-page>

in web.xml . I also tried to do this using Servlet:

 <servlet> <servlet-name>ErrorHandler</servlet-name> <servlet-class>web.servlet.ErrorHandler</servlet-class> </servlet> <servlet-mapping> <servlet-name>ErrorHandler</servlet-name> <url-pattern>/errorhandler</url-pattern> </servlet-mapping> <error-page> <error-code>500</error-code> <location>/errorhandler</location> </error-page>

But none of them are related to calling error.jspx and ErrorHandler Servlet.

To check for error handling, I tried to throw new Exception("Test"); from both managed bean constructors, as well as from actionListener . But it prints an exception in the console, but the redirection does not occur.

I also tried: <exception-type>java.lang.Exception</exception-type> instead of <error-code>500</error-code> , but no luck. How can I call a Servlet or go to a page whenever an exception occurs from anywhere, such as a constructor or any of the action / actionListener ?

+4
source share
1 answer

I do not know if this will serve you. I have a handler for any error defined as follows.

In "faces-config.xml"

  <factory> <exception-handler-factory> com.mypackage.global.DatExceptionHandlerFactory </exception-handler-factory> </factory>

And two classes

 import javax.faces.context.ExceptionHandler; import javax.faces.context.ExceptionHandlerFactory; public class DatExceptionHandlerFactory extends ExceptionHandlerFactory { private ExceptionHandlerFactory parent; // this injection handles jsf public DatExceptionHandlerFactory(ExceptionHandlerFactory parent) { this.parent = parent; } //create your own ExceptionHandler @Override public ExceptionHandler getExceptionHandler() { ExceptionHandler result = new DatExceptionHandler(parent.getExceptionHandler()); return result; } }

Second class

 import java.util.Iterator; import javax.faces.FacesException; import javax.faces.application.NavigationHandler; import javax.faces.context.ExceptionHandler; import javax.faces.context.ExceptionHandlerWrapper; import javax.faces.context.FacesContext; import javax.faces.context.Flash; import javax.faces.event.ExceptionQueuedEvent; import javax.faces.event.ExceptionQueuedEventContext; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; public class DatExceptionHandler extends ExceptionHandlerWrapper { private static Log log = LogFactory.getLog(DatExceptionHandler.class); private ExceptionHandler wrapped; public String error = "n"; public String getError() { return error; } public void setError(String error) { this.error = error; } public DatExceptionHandler(ExceptionHandler wrapped) { this.wrapped = wrapped; } @Override public ExceptionHandler getWrapped() { return wrapped; } @Override public void handle() throws FacesException { Iterator iterator = getUnhandledExceptionQueuedEvents().iterator(); while (iterator.hasNext()) { ExceptionQueuedEvent event = (ExceptionQueuedEvent) iterator.next(); ExceptionQueuedEventContext context = (ExceptionQueuedEventContext)event.getSource(); Throwable throwable = context.getException(); FacesContext fc = FacesContext.getCurrentInstance(); try { Flash flash = fc.getExternalContext().getFlash(); // Put the exception in the flash scope to be displayed in the error // page if necessary ... flash.put("errorDetails", throwable.getMessage()); System.out.println("the error is put in the flash: " + throwable.getMessage()); NavigationHandler navigationHandler = fc.getApplication().getNavigationHandler(); navigationHandler.handleNavigation(fc, null, "components/errorHandler.xhtml?faces-redirect=true"); fc.renderResponse(); } finally { iterator.remove(); } } // Let the parent handle the rest getWrapped().handle(); } }

And errorHandler.xhtml to show the error

 <?xml version='1.0' encoding='UTF-8' ?> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html"> <h:head> <link type="text/css" rel="stylesheet" href="#request.contextPath}/css/default.css" /> <title>#{bundle['guessNumber.error_page.title']}</title> </h:head> <h:body> <div class="highlighted errorMessage"> <h:outputText escape="false" value="#{bundle['guessNumber.error_page.content']}"/> </div> <br/><br/> <div class="errorDetails"> Error details: <br/> #{flash.keep.errorDetails} </div> </h:body> </html>
0
source

More articles:


All Articles