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JSF : redirect errors to error page

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posted 12 years ago

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Hi All ,

I am trying ( using jsf ) to redirect the errors to the error page errors.jsp , but the following does not work ( part of web.xml)

because when i am trying to access a page which does not exist in my application it display the page with code
HTTP Status 404

is my there anything wrong in my above code , what is the best way to redirect jsf errors to error pages with example if possible.

Suresh Khant

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posted 12 years ago

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Hi All ,

I have changed the code as the following

error.jsp

by the way the above code redirect to error.jsp if there is error but the contents of error.jsp will not be displayed properly i mean only blank page will be displayed ..........
any one can help me to display the content of error.jsp properly.........................

Suresh Khant

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posted 12 years ago

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any reply

Cesar Loachamin

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Hi Suresh

Try with this example

This is the web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns="http://java.sun.com/xml/ns/javaee"
   xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
   version="2.5">
<servlet>
   <servlet-name>Faces Servlet</servlet-name>
   <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
</servlet>
<servlet-mapping>
  <servlet-name>Faces Servlet</servlet-name>
  <url-pattern>/faces/*</url-pattern>  
</servlet-mapping>

<welcome-file-list>
  <welcome-file>faces/index.xhtml</welcome-file>
</welcome-file-list>

<context-param>
  <param-name>javax.faces.PROJECT_STAGE</param-name>
  <param-value>Production</param-value>
</context-param>

<error-page>
  <error-code>500</error-code>
  <location>/faces/errorDisplay.xhtml</location> 
</error-page>
<error-page>
   <exception-type>java.lang.Exception</exception-type>
   <location>/faces/exception.xhtml</location>
</error-page>

The errorDisplay.xhtml

And the Managed Bean "error"

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

or @ManagedBean(name="error")
@RequestScoped
public class ErrorBean {
   public String getStackTrace() {
      FacesContext context = FacesContext.getCurrentInstance();
      Map<String, Object> request 
         = context.getExternalContext().getRequestMap();
      Throwable ex = (Throwable) request.get("javax.servlet.error.exception");
      StringWriter sw = new StringWriter();
      PrintWriter pw = new PrintWriter(sw);
      fillStackTrace(ex, pw);
      return sw.toString();
   }

private static void fillStackTrace(Throwable t, PrintWriter w) {
      if (t == null) return;
      t.printStackTrace(w);
      if (t instanceof ServletException) {
         Throwable cause = ((ServletException) t).getRootCause();
         if (cause != null) {
            w.println("Root cause:");
            fillStackTrace(cause, w);
         }
      } else if (t instanceof SQLException) {
         Throwable cause = ((SQLException) t).getNextException();
         if (cause != null) {
            w.println("Next exception:");
            fillStackTrace(cause, w);
         }
      } else {
         Throwable cause = t.getCause();
         if (cause != null) {
            w.println("Cause:");
            fillStackTrace(cause, w);
         }
      }
   }
}

I hope this example will serve to show the error information that you need.

Regards

Cesar

When a dream is ending because to come true - OCPJP 6,7. OCE JPA EE6. MCTS

Cesar Loachamin

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posted 12 years ago

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Hi Suresh

I forgot to tell you, when you use the this mechanism to show error page you have several objects that contains important information, that objects are placed in the request map.

Key	Value	Type
javax.servlet.error.status_code	The HTTP error code	Integer
javax.servlet.error.message	A description of the error	String
javax.servlet.error.exception_type	The class of the exception	Class
javax.servlet.error.exception	The exception object	Throwable
javax.servlet.error.request_uri	The path to the application resource that encountered the error	String
javax.servlet.error.servlet_name	The name of the servlet that encountered the error	String

For example if you need to get the page that produce the exception you can do it,

Regards

Cesar

When a dream is ending because to come true - OCPJP 6,7. OCE JPA EE6. MCTS

Suresh Khant

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posted 12 years ago

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Thanks Cesar for you reply ,

I have implemented your above code but I have got new error

when redirecting to exception.jsf

2011-01-02 11:52:19,422 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost]] Exception Processing ErrorPage[exceptionType=javax.servlet.ServletException, location=/errorPages/exception.jsf]
javax.servlet.ServletException: viewId:/errorPages/exception.jsf - View /errorPages/exception.jsf could not be restored.
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:249)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:687)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:403)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
        at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:424)
        at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:271)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
        at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)
        at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:853)
        at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
        at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1513)
        at java.lang.Thread.run(Thread.java:595)
Caused by: javax.faces.application.ViewExpiredException: viewId:/errorPages/exception.jsf - View /errorPages/exception.jsf could not be restored.
        at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:187)
        at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
        at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
        ... 17 more

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