date:20010222

RE: Bowser back buttons and jsp

2001-02-22 Thread Ray Brown


What is an example of the errors?

I use a nice freebie menu system, written in JavaScript, for
my apps and if the user uses the "Back" button (provided by
the browser) and the page has not fully been written by the
browser, the browser decides not to display the page at all.
If you request to view the source, it's there.  Is this the\
kind of error you mean?  [This occurs under NS4.5 on Apache
or Orion]

Ray

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of
[EMAIL PROTECTED]
Sent: Wednesday, February 21, 2001 3:49 PM
To: Orion-Interest
Subject: Bowser back buttons and jsp



This question doesn't really apply to the webserver in general.  I have
developed an ecommerce application using java beans and jsp.
Unfortunately, during qa testing, one problem keeps coming up.  If you
click the back button on the browser and ignore the navigation built into
the system, you encounter errors.  I've researched if there was a way to
disable the browser navigation options via javascript or some other way but
I found that this is not really possible.  What I was wondering is how do
other java professionals handle this problem?  Has anyone ever ran into
this?

RE: Error Page

2001-02-22 Thread Randahl Fink Isaksen





Could 
anyone tell me where this syntax from web.xml is defined (could not find it in 
the JSP 1.2 spec - there is no complete documentation on 
web.xml):

error-page
 
error-code500/error-code
 
exception-typejava.lang.Exception/exception-type
 
locationerror_500.jsp/location
/error-page

TIA

Randahl


[Randahl Fink Isaksen]


-Original Message-From: 
[EMAIL PROTECTED] 
[mailto:[EMAIL PROTECTED]]On Behalf Of Conrad 
ChanSent: 22. februar 2001 00:32To: 
Orion-InterestSubject: RE: Error Page

  Or 
  set the return status code backto 200 since I really don't see a reason 
  why I would like to return 500 if my error page will be probably 
  shown.
  Conrad
  
-Original Message-From: SureTicket.com 
[mailto:[EMAIL PROTECTED]]Sent: Wednesday, February 21, 2001 
1:20 PMTo: Orion-InterestSubject: RE: Error 
Page
To 
be honest i think its because of IE's friendly error messages. You can turn 
them off and try again.



  -Original Message-From: 
  [EMAIL PROTECTED] 
  [mailto:[EMAIL PROTECTED]]On Behalf Of 
  [EMAIL PROTECTED]Sent: Wednesday, February 21, 2001 1:15 
  PMTo: Orion-InterestSubject: Error 
  Page
  Hello,
  I placed an error page tag in the web.xml in 
  order to show a warning when any kind of error occurs.
  However, that works fine with Netscape but 
  not with Internet Explorer. Does anyone have any idea?
  The following is the error page tag that I 
  put.
  
  error-page
   
  error-code500/error-code
   
  exception-typejava.lang.Exception/exception-type
   
  locationerror_500.jsp/location
  /error-page
  
  I tried to put the whole URL in the location 
  field, but it was of no use.
  Please anyone.. I really 
  appreciate all your clues in advance.
  
  
  
  Simon

RE: No influence on CMP 2.0 getter setter methods - a feature or a bug?

2001-02-22 Thread Daniel Cardin


I completely understand where you're trying to go. However, keep in mind

Entity beans are not meant to hold business rules. They are an interface
to
your physical storage. 

We have solved that problem using a facade pattern that basically works
by 
shielding the developper from the actual method being called on the
server. 

For example:

Create an Entity bean AccountBean
Create a stateless session bean AccountBusinessRules

Leave the setBalance in the Entity Bean and add a setBalance in the
BusinessRules bean.
Use a reference to the remote interface as the first parameter, like
this :

public class AccountBusinessBean implements SessionBean
...
public setBalance(AccountBean ref, float balance)
{
// put the business code here...

// you can also use 
ref.setBalance(balance); 
}
... other business methods, not necessarily tied to remotes

The facade has the following generated code (with checks, try catch
etc.):
public class Account extends BusinessObject
public setBalance(float balance)
{
getBusinessBean().setBalance(getRemote(), balance); 
}
... the other business methods calls 


The client application instantiates the facade object

Account acct = new Account(new Integer(accountNumber)); // for
an existing entity
acct.setBalance(newBalance);

The client application developper does not know (or need to know?) which
method gets called. It's the 
job of the developper providing the Bean.

So the trick is generating the facade. We use a java doclet that
generates our facade objects by 
combining AccountBean methods with AccountBusinessRules methods. We use
method tags in the Entity 
and Business beans to "inform" the doclet about how to process the
methods in the facade.

This allows an easy switch from a "pure" data set (method only in the
Entity Bean) to a business 
method being called (both in Entity and BusinessRules) without impacting
existing client applications 
in any way.

As a bonus, with stateless session beans, you get pooling of business
methods, which makes more
efficient use of the server's ressources than having the code in
stateful beans or entity beans (BMP).

This works very well for us. If you have better suggestions, let's
discuss them!

Cheers,

Daniel


-Message d'origine-
De : Randahl Fink Isaksen [mailto:[EMAIL PROTECTED]]
Envoy : 21 fvrier, 2001 11:46
 : Orion-Interest
Cc : Jens Peter Grosen; Simon Anker Christiansen; Kim Jrgensen
Objet : No influence on CMP 2.0 getter setter methods - a feature or a
bug?


I have been reading the CMP 2.0 specification and I think it is simply
great! Still, I am a bit surprised that the bean developer has no
control
over what happens when a field is set. Imagine an AccountBean, for
instance:

public abstract class AccountBean extends EntityBean {
//implemented by the persistence manager
public abstract Float getBalance();
//implemented by the persistence manager
public abstract void setBalance(Float balance);
}

What if I wanted to do something useful when the balance was set? Say, I
wanted to add the account  to a list of surveilled accounts if a
negative
balance was set... it seems I cannot do that because the container
implements the setBalance() method for me. And I cannot just declare a
setBalance() method myself because I need the container's implementation
or
I will not be able to store the balance. H... it seems this is going
to
leave me with something like

public abstract class AccountBean extends EntityBean {
public abstract Float getBalance();
public abstract void setBalance(Float balance);

public void
setBalanceAndDoWhatHasToBeDoneWhenYouSetBalance(Float balance)
{
//check if balance is negative and take action
...
setBalance(balance);
}
}

Now I have _no_ guarantee that nobody will accidently call the original
setBalance() method, thereby circumventing my little security system,
which
was supposed to check for a negative balance. But, hey, I thought, then
I
will just declare the original setBalance() as protected - unfortunately
that is not allowed by the specification.

I would r e a l l y like to hear from anybody who knows a solution to
this.
Any comments would be most welcomed.

Randahl

RE: restarting orion

2001-02-22 Thread James Nelson

Take off the :90, it should just be ormi://localhost 

-Original Message-
From: Peter Peltonen [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, February 21, 2001 9:39 AM
To: Orion-Interest
Subject: restarting orion

When I give the command "java -jar admin.jar ormi://localhost:90 admin
mypassword -restart" I get the error message:

Error: javax.naming.NamingException: Lookup error:
java.io.StreamCorruptedException: Caught EOFException while reading the
stream
header; nested exception is: 
java.io.StreamCorruptedException: Caught EOFException while reading
the stream header

Here's some background of my fresh installation:

I've installed Orion 1.4.5 on RedHat Linux 6.2 that has j2sdkee-1_2_1 and
jdk1.2.2 installed on it.

I followed the instructions in Installation Guide and unpacked Orion to
/usr/src/orion as root. 

I ran the command "java -jar orion.jar -install" which asked for an admin
password. I gave it a one.

I started Orion with "java -jar orion.jar".

I tried and I can access the server with my web browser.

What's wrong, why won't my Orion restart? 

Regards,
Peter

Re: Debugging and orion

2001-02-22 Thread Justen Stepka


No matter what anyone tells you,

System.out.println ("ObjectName:MethodName ():line number");

will work wonders!

Justen Stepka

On Wed, 21 Feb 2001, Julian Richardson wrote:

 Hi,

 What tools / IDEs are people out there using to develop EJBs for use with
 Orion? At the moment we (as a project team, rather than company) are trying
 to standardise on an app server and IDE to use, requirements being the
 usual:

   cost
   speed
   flexibility
   resource usage
   debugging support from the IDE

 - I saw that someone mentioned using Kawa with Orion on the orionsupport
 website; has this combination been used by many people? (I'm new to the app
 server world, although I've been doing server-side Java work for several
 years now - I'm not used to environments where it's even possible to use an
 integrated debugger, but others on the team say it's necessary :-)

 Comments about the speed / flexibility / resource usage of Orion are welcome
 too, from the website it looks pretty slick and the documentation looks
 good, but time will tell... also if there's any major snags with orion in
 terms of things that the current version doesn't do correctly or doesn't
 implement...

 cheers

 Jules

 --

SV: Bowser back buttons and jsp

2001-02-22 Thread Magnus Rydin

Title: SV: Bowser back buttons and jsp





Just make sure that your application can handle ppl going forward and backward.
Disble cache:ing if needed and define flowcontrol to manage the flow.
Its pretty basic.
WR


 -Ursprungligt meddelande-
 Från: Tim Endres [mailto:[EMAIL PROTECTED]]
 Skickat: den 21 februari 2001 13:44
 Till: Orion-Interest
 Ämne: Re: Bowser back buttons and jsp
 
 
 I believe you will need to design your system to accomodate this case.
 There is no workaround that I am aware of, and this is a very common
 user behavior.
 
 tim.
 
  This question doesn't really apply to the webserver in 
 general. I have
  developed an ecommerce application using java beans and jsp.
  Unfortunately, during qa testing, one problem keeps coming 
 up. If you
  click the back button on the browser and ignore the 
 navigation built into
  the system, you encounter errors. I've researched if there 
 was a way to
  disable the browser navigation options via javascript or 
 some other way but
  I found that this is not really possible. What I was 
 wondering is how do
  other java professionals handle this problem? Has anyone 
 ever ran into
  this?

SV: EJB 2.0 CMP features of Orion

2001-02-22 Thread Magnus Rydin

Title: SV: EJB 2.0 CMP features of Orion

One more thing,
currently, you need to add the object on each end of the bidirectional 1-n relation.

Finders are automatically generated for simple expressions, such as
findByCustomer, findbyId etc
but does not handle
findByCustomerAndId
etc.
And Im happy that more time is *not* spent on handling findByThisAndThat etc, as atleast I gonna rely on EJB QL as soon as its implemented.

-Ursprungligt meddelande-
Från: Jeff Schnitzer [mailto:[EMAIL PROTECTED]]
Skickat: den 21 februari 2001 13:55
Till: Orion-Interest
Ämne: RE: EJB 2.0 CMP features of Orion

Unidirectional 1-1 and 1-n relationships between EJBs work, but
bidirectional relationships do not. There are easy ways to fake it,
though.

It's not strictly according to the specification - with
Orion, you must
define the CMR fields as cmp-fields in the entity. pd2
and pdf say
you shouldn't. This may have been a change going from pd1 to
pd2; most
of the CMR (and DO) stuff is based on pd1. I can't fault the
Orion team
for not keeping up with every zigzag (there have been several).

Another thing I noticed is that (at least in 1.4.5) primitive EJB-QL
seems to work. When I create a simple findByField method,
Orion figures
out how to create the appropriate finder-method in orion-ejb-jar.xml.

Jeff

-Original Message-
From: Randahl Fink Isaksen [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, February 21, 2001 4:48 AM
To: Orion-Interest
Subject: EJB 2.0 CMP features of Orion

Has anyone tried out OR-mapping of 1-1 relationships and 1-n
relationships
between two EJBs? I have seen Jim Archer's fine tutorial about
EJBs having a
1-1 or 1-n relationship to a *dependent object*, but is the
same thing
possible between two EJBs?
I know the web site states that Orion 1.2.9 does NOT support n-m
relationships, but is 1-1 or 1-n supported in the latest
release, and is the
support for 1-1 and 1-n in accordance with the specification?

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