Re: Redirect after session expires?

2002-02-13 Thread David Cassidy 

is there a session.isInvalid() method ?

If so ... :)

D



Michael Molloy wrote:

 I've got an application that builds menus when a user logs in and sticks the menus 
in an object which I then put inside the session. All subsequent jsps get their menu 
from that object in the session.

 However, when their session expires and they try to access a jsp, they get a 
NullPointerException, as expected.

 How can I catch that error and redirect them to the logon page? Or is their some 
other way to handle it? Is there a better way than putting some if else statements in 
the jsp to check the session for the menu object?

 Thanks
 --Michael

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Re: Redirect after session expires?

2002-02-13 Thread Michael Molloy 

Well, we're trying to keep as much logic out of the jsps as possible, so if there is a 
setting for web.xml or something to foward all pages that throw exceptions to a 
certain url, that's what I'm looking for.

I appreciate your suggestion, and if that's what we need to do, we'll do it, but I'd 
like to know about any other possibilities, also.

Thanks
--Michael

On Wed, 13 Feb 2002 15:37:53 +
David Cassidy [EMAIL PROTECTED] wrote:

 is there a session.isInvalid() method ?
 
 If so ... :)
 
 D
 
 
 
 Michael Molloy wrote:
 
  I've got an application that builds menus when a user logs in and sticks the menus 
in an object which I then put inside the session. All subsequent jsps get their menu 
from that object in the session.
 
  However, when their session expires and they try to access a jsp, they get a 
NullPointerException, as expected.
 
  How can I catch that error and redirect them to the logon page? Or is their some 
other way to handle it? Is there a better way than putting some if else statements in 
the jsp to check the session for the menu object?
 
  Thanks
  --Michael
 
  --
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  For additional commands: mailto:[EMAIL PROTECTED]
  Troubles with the list: mailto:[EMAIL PROTECTED]
 
 
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Re: Redirect after session expires?

2002-02-13 Thread Christopher K. St. John 

Michael Molloy wrote:
 
 ... if there is a setting for web.xml or something
 to foward all pages that throw exceptions to a certain
 url, that's what I'm looking for.
 

 In web.xml:

 error-page
exception-type MyException /exception-type
location /myexception.html /location
  /error-page

 the servlet spec[1] has a complete description in
section SRV.9.9.2.


[1] http://java.sun.com/products/servlet/download.html
 

-- 
Christopher St. John [EMAIL PROTECTED]
DistribuTopia http://www.distributopia.com

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Re: Redirect after session expires?

2002-02-13 Thread Michael Molloy 

I will check it out. Thanks very much for the information.

--Michael

On Wed, 13 Feb 2002 10:57:09 -0600
Christopher K. St. John [EMAIL PROTECTED] wrote:

 Michael Molloy wrote:
  
  ... if there is a setting for web.xml or something
  to foward all pages that throw exceptions to a certain
  url, that's what I'm looking for.
  
 
  In web.xml:
 
  error-page
 exception-type MyException /exception-type
 location /myexception.html /location
   /error-page
 
  the servlet spec[1] has a complete description in
 section SRV.9.9.2.
 
 
 [1] http://java.sun.com/products/servlet/download.html
  
 
 -- 
 Christopher St. John [EMAIL PROTECTED]
 DistribuTopia http://www.distributopia.com
 
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Re: Redirect after session expires?

2002-02-13 Thread jeff . guttadauro 


There is no session.isInvalid() method - that wouldn't make any sense anyway.
If you have an actual session to ask if it's valid or not, how could it ever
be invalid?  There is an isNew() method, and I have not used this, but from
reading the spec it doesn't sound like it will do the trick.

There is a way to define an errorPage, a page that your JSP will forward to if
it throws an Exception.  %@ page errorPage=relativeURL %  You'll have to
put this in each of your pages though, so it might not be what you're looking
for, although then all the logic to handle the exception would just be in the
errorPage.

You could also look into binding the session by creating an object that
implements HttpSessionBindingListener.  Then when the session expires, the
valueUnbound( event ) method will be called by the servlet engine.  You could
put code in that method to handle this case.

Hope this helps.
-Jeff



   

Michael

Molloy   To: Tomcat Users List 
[EMAIL PROTECTED]  
mmolloy@ncyccc:   

les.com Subject: Re: Redirect after session 
expires?  
   

02/13/02   

09:54 AM   

Please 

respond to 

Tomcat Users  

List  

   

   





Well, we're trying to keep as much logic out of the jsps as possible, so if
there is a setting for web.xml or something to foward all pages that throw
exceptions to a certain url, that's what I'm looking for.

I appreciate your suggestion, and if that's what we need to do, we'll do it,
but I'd like to know about any other possibilities, also.

Thanks
--Michael

On Wed, 13 Feb 2002 15:37:53 +
David Cassidy [EMAIL PROTECTED] wrote:

 is there a session.isInvalid() method ?

 If so ... :)

 D



 Michael Molloy wrote:

  I've got an application that builds menus when a user logs in and sticks
the menus in an object which I then put inside the session. All subsequent
jsps get their menu from that object in the session.
 
  However, when their session expires and they try to access a jsp, they get
a NullPointerException, as expected.
 
  How can I catch that error and redirect them to the logon page? Or is
their some other way to handle it? Is there a better way than putting some if
else statements in the jsp to check the session for the menu object?
 
  Thanks
  --Michael
 
  --
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  For additional commands: mailto:[EMAIL PROTECTED]
  Troubles with the list: mailto:[EMAIL PROTECTED]


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Re: Redirect after session expires?

2002-02-13 Thread jeff . guttadauro 


Or you could just do that...  :/

Very cool!  Thanks for that nugget, Christopher.



   

Christopher   

K. St. John To: Tomcat Users List 
[EMAIL PROTECTED]
cks@distribucc:   

topia.com   Subject: Re: Redirect after session 
expires?  
   

02/13/02   

10:57 AM   

Please 

respond to 

Tomcat Users  

List  

   

   





Michael Molloy wrote:

 ... if there is a setting for web.xml or something
 to foward all pages that throw exceptions to a certain
 url, that's what I'm looking for.


 In web.xml:

 error-page
exception-type MyException /exception-type
location /myexception.html /location
  /error-page

 the servlet spec[1] has a complete description in
section SRV.9.9.2.


[1] http://java.sun.com/products/servlet/download.html


--
Christopher St. John [EMAIL PROTECTED]
DistribuTopia http://www.distributopia.com

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RE: Redirect after session expires?

2002-02-13 Thread Jim Urban 

According to the servlet spec, when calling
HttpServletRequest.getSession(boolean) with a parameter of false will tell
you if the session is valid:  If create is false and the request has no
valid HttpSession, this method returns null.

So, one way of telling if a session is valid is:
HttpSession session = httpServletRequest.getSession(false);
if (session == null) {
invalid session code...
}

 -Original Message-
 From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
 Sent: Wednesday, February 13, 2002 10:14 AM
 To: Tomcat Users List
 Subject: Re: Redirect after session expires?



 There is no session.isInvalid() method - that wouldn't make any
 sense anyway.
 If you have an actual session to ask if it's valid or not, how
 could it ever
 be invalid?  There is an isNew() method, and I have not used
 this, but from
 reading the spec it doesn't sound like it will do the trick.

 There is a way to define an errorPage, a page that your JSP will
 forward to if
 it throws an Exception.  %@ page errorPage=relativeURL %
 You'll have to
 put this in each of your pages though, so it might not be what
 you're looking
 for, although then all the logic to handle the exception would
 just be in the
 errorPage.

 You could also look into binding the session by creating an object that
 implements HttpSessionBindingListener.  Then when the session expires, the
 valueUnbound( event ) method will be called by the servlet
 engine.  You could
 put code in that method to handle this case.

 Hope this helps.
 -Jeff





 Michael

 Molloy   To: Tomcat Users
 List [EMAIL PROTECTED]
 mmolloy@ncyccc:

 les.com Subject: Re:
 Redirect after session expires?


 02/13/02

 09:54 AM

 Please

 respond to

 Tomcat Users

 List









 Well, we're trying to keep as much logic out of the jsps as
 possible, so if
 there is a setting for web.xml or something to foward all pages that throw
 exceptions to a certain url, that's what I'm looking for.

 I appreciate your suggestion, and if that's what we need to do,
 we'll do it,
 but I'd like to know about any other possibilities, also.

 Thanks
 --Michael

 On Wed, 13 Feb 2002 15:37:53 +
 David Cassidy [EMAIL PROTECTED] wrote:

  is there a session.isInvalid() method ?
 
  If so ... :)
 
  D
 
 
 
  Michael Molloy wrote:
 
   I've got an application that builds menus when a user logs in
 and sticks
 the menus in an object which I then put inside the session. All subsequent
 jsps get their menu from that object in the session.
  
   However, when their session expires and they try to access a
 jsp, they get
 a NullPointerException, as expected.
  
   How can I catch that error and redirect them to the logon page? Or is
 their some other way to handle it? Is there a better way than
 putting some if
 else statements in the jsp to check the session for the menu object?
  
   Thanks
   --Michael
  
   --
   To unsubscribe:   mailto:[EMAIL PROTECTED]
   For additional commands: mailto:[EMAIL PROTECTED]
   Troubles with the list: mailto:[EMAIL PROTECTED]
 
 
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