Applet client with DataForms using dial-up
Jdeveloper 3.2, IAS9i
Hello,
Somebody knows if the DataForms are efficient via dial-up?
For example in the Online Orders sample,with an applet client (with DataForms, using dialup to connect to app. server). What happens when an user insert a new employee record. When an user navigate around the fields ocurrs a validation inside the Business Object Tier. What happens with the remote round trips?, It's faster?.
Jdeveloper 3.2.2
IAS9i
Thanks a lot.
null
Any application designed to run over a dial -up connection must be extremely sensitive to the fact that dial-up connection is very slow due to it's bandwidth.
Applets by default require downloading a lot of files to the browser. So you must download your app code, the jdbc drivers and any other required classses.
Applets using BC4J components then must also download the BC4J code. BC4J uses a data cache, so data is also downloaded.
Avoid using applets in this design.
Use JavaServerPages(JSP's) (or servlets) which are a much "thinner" version of the "Thin client" group of tools(applets, servlets jsp's)
WHY JSP's over servlets ??
They are quicker to write than servlets
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TIA
"Eduardo Ceballos" <[email protected]> wrote in message
news:[email protected]...
We currently publish an IDL example, even though the IDL programmingmodel in Java is completely non-functional, in anticipation of the support
needs for uses who need to use IDL to talk to the Weblogic server,
generically. This example illustrates the simplest connectivity; it does not
address how
to integrate CORBA and EJB, a broad topic, fraught with peril, imo. I'llnote in passing that, to my knowledge, none of the other vendors attempt
this topic either, a point which is telling if all the less happy to hear.
For the record then, what is missing from our distribution wrt RMI-IIOPare a RMI-IIOP example, an EJB-IIOP example, an EJB-C++. In this you are
correct; better examples are forth coming.
Still, I would not call our RMI-IIOP implementation fragile. I would saythat customers have an understandably hard time accepting that the IDL
programming model is busted; busted in the sense that there are no C++
libraries to support the EJB model, and busted in the sense that there is
simply no
support in Java for an IDL interface to an EJB. Weblogic has nothing to doit being busted, although we are trying to help our customers deal with it
in productive ways.
For the moment, what there is is a RMI (over IIOP) programming model, aninherently Java to Java programming model, and true to that, we accept and
dispatch IIOP request into RMI server objects. The way I look at it is this:
it's just a protocol, like HTTP, or JRMP; it's not IDL and it has
practically nothing to do with CORBA.
ST wrote:
Eduardo,
Can you give us more details about the comment below:
I fear that as soon as the call to narrow succeeds, the remainingapplication will fail to work correctly because it is too difficult ot
use an idl client in java to work.It seems to me that Weblogic's RMI-IIOP is a very fragile
implementation. We
don't need a "HelloWorld" example, we need a concrete serious example(fully
tested and seriously documented) that works so that we can get a betteridea
on how to integrate CORBA and EJB.
Thanks,
Said
"Eduardo Ceballos" <[email protected]> wrote in message
news:[email protected]...
Please post request to the news group...
As I said, you must separate the idl related classes (class files and
java
files) from the rmi classes... in the rmic step, you must set a newtarget
(as you did), emit the java files into that directory (it's not clearyou
did this), then remove all the rmi class files from the class path... ifyou
need to compile more classes at that point, copy the java files to theidl
directly is you must, but you can not share the types in any way.
I fear that as soon as the call to narrow succeeds, the remainingapplication will fail to work correctly because it is too difficult otuse
an idl client in java to work.
Harindra Rajapakshe wrote:
Hi Eduardo,
Thanks for the help. That is the way I compiled my CORBA client, by
separating the IDL-generated stubs from the RMI ones, but still I
get a
CORBA.BAD_PARAM upon narrowing the client proxy to the interfacetype.
Here's what I did;
+ Define the RMI interfaces, in this case a StockTrader interface.
+ Implement RMI interface by extendingjavax.rmi.PortableRemoteObject
making
it IIOP compliant
+ Implemnnt an RMI server, and compile using JDK1.2.2
+ use the RMI implementation to generate CORBA idl, using RMI-IIOPplugin
utility rmic;
rmic -idl -noValueMethods -always -d idl stock.StockTraderImpl
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util,
idlj -v -fclient -emitAll -tf src stocks\StockTrader.idl
This creates source for the package stock and also
org.omg.CORBA.*
package, presumably IIOP type marshalling
+ compile all classes generated above using JDK1.2.2
+ Implement client (CORBA) using the classes generated above, NOTthe
RMI
proxies.
+ start RMI server, with stockTrader server obj
+ start tnameserv
+ start CORBA client
Then the client errors when trying to narrow the obj ref from the
naming
service, into the CORBA IDL defined interface using,
org.omg.CORBA.Object obj =naming.resolve(nn);
StockTrader trader =StockTraderHelper.narrow(obj); // THIS
ERRORS..!!!
throwing a CORBA.BAD_PARAM exception.
any ideas..?
Thanks in advance,
-hari
----- Original Message -----
From: Eduardo Ceballos <[email protected]>
Newsgroups: weblogic.developer.interest.rmi-iiop
To: Hari Rajapakshe <[email protected]>
Sent: Wednesday, July 26, 2000 4:38 AM
Subject: Re: problem using CORBA clients with RMI/EJBservers..!!!???
Please see the post on june 26, re Errors compiling... somewherein
there,
I suspect, you are referring to the rmi class file when you are
obliged
to
completely segregate these from the idl class files.
Hari Rajapakshe wrote:
Hi,
I have a question on using EJB / or RMI servers with CORBA
clients
using
RMI-IIOP transport, which in theory should work, but in practice
has
few
glitches.
Basically, I have implemented a very simple server,
StockTreader,
which
looks up for a symbol and returns a 'Stock' object. In the firstexample, I
simplified the 'Stock' object to be a mere java.lang.String, so
that
lookup
would simply return the 'synbol'.
Then I have implemented the above, as an RMI-IIOP server (case
1)
and a
CORBA server (case 2) with respective clients, and the pair of
client-servers work fine as long as they are CORBA-to-CORBA andRMI-to-RMI.
But the problem arises when I tried using the RMI server (via
IIOP)
with
the
CORBA client, when the client tries to narrow the object ref
obtained
from
the naming service into the CORBA idl defined type (StockTrader)
it
ends
up
with a class cast exception.
This is what I did to achieve the above results:
[1] Define an RMI interface StockTrader.java (extending
java.rmi.Remote)
with the method,
public String lookup( String symbol) throws RMIException;
[2] Implement the StorckTrader interface (on a
PortableRemoteObject
derived
class, to make it IIOP compliant), and then the server to
register
the
stock
trader with COS Naming service as follows:
String homeName =....
StockTraderImpl trader =new StockTraderImpl();
System.out.println("binding obj <" homeName ">...");
java.util.Hashtable ht =new java.util.Hashtable();
ht.put("java.naming.factory.initial", args[2]);
ht.put("java.naming.provider.url", args[3]);
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class,
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rmic -idl stock.StockTraderImpl
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[6] Write the client to use the IDL-defined stock trader,
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String symList =args[1];
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... define a naming component etc...
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The CORBA client successfully finds the server obj ref in the
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StockTrader trader =StockTraderHelper.narrow(obj);
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This is of the same type when stock trader object is registeredin a
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casting
excpetions..
Any ideas / hints very welcome.
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Advantages and Disadvantages of Using Oracle 7 Client with Oracle 9 Server
Hello,
I was wondering what are the advanatges of using Oracle 7 client with Oracle 9 Server versus using Oracle 9 Client with Oracle 9 server.Some years ago I used 7.3 Client with 9i DB, and I don't remember of particular problems, but I'm speaking of Sql*Plus only. Are there specific problems ?
Of course the best thing is to install one 9i Client (did you already do it ?) : if there are same problems, then that's not compatibility issue.
And what are advantages of using 9 Client with 9 server other than 7 is no longer supported.You're sure you won't have compatibility problems.
If you have access to Metalink have a look at [url http://metalink.oracle.com/metalink/plsql/ml2_documents.showFrameDocument?p_database_id=NOTE&p_id=207303.1]Note 207303.1 -
Which mail client do I use with iCal server?
I will soon have os x server, and I want to use iCal server with mail. I want to schedule meetings, etc., like Exchange. However, many people have Outlook. Some have Entourage. Will these clients with with iCal for scheduling meetings and if not which client can I use? Thank you.
Which Platform are the clients?
Apple Mail does not work directly with iCal server. The Leopard version of iCal is what is used for scheduling. Mail is not like Outlook on PC or Entourage on the Mac where email, calendering and contacts are in one application. Leopard uses Mail, iCal, Address Book to provide similar functions.
Also check out this doc
http://images.apple.com/server/macosx/docs/iCalService_Admin_v10.5_2ndEd.pdf
Tells you all the 3rd Party client apps that work with iCal Server. -
Using MAS/MAR with SQL 2005 / MSA clients with SQL2000 ?
Hello,
for the upgrade to MAS/MAR 5.0 SP15, SQL2005 is only supported.
AT the moment we use 5.0 SP11 with SQL2000.
Is it possible to install the sql2005 only on the MAR/MAS and create an upgrade
package (MUP) for MAS clients (with SQL2000), which should also be upgraded to 5.0 SP15 ?
Or must I upgrade the msa-clients to sql2005 too ?
Or can I upgrade the MAR/MAS with SQL2000 and forget the SQL-upgrade to 2005 ?
WHat do you think is the best way ?
Thanks,
GerdThere are two possible scenarios for this issue.
If all the clients are connected in network :
1 You can take the IDES DB Backup in one machine copy it to all client laptops and restore it. you can also achive this using SQL server inbuilt stored procedures. i.e this can be automated with simple SQL script.
If the client laptops are not in the network
1. One way is, you have to upgrade one client laptop machine to SQL Server 2005 and make sure that every thing works fine. take the image of the machine, pack it in MUP and roll out to all client laptops. This is the preferred way of doing.
2. Secnd way is, You just need to automate the entire of task of taking the IDES DB backup in each user laptop, install the SQL server 2005 and then attaching the backup DB. It is not tested by us and not sure of the results.
Best Regards
Shankar -
I encountered a problem with some client machines that use Firefox version 24ESR and IE8.
Ajax requests of aspx pages from Firefox are getting the following error from the iis server (iis version 7.5):
Bad Request - Request Too Long
HTTP Error 400. The size of the request headers is too long.
From analyzing the request that was sent to the server, I saw that the request consist of only the viewstate of the aspx page.
I tried to disable the viewstate for one page and the server got the request correctly.
I do not encounter any issues on these laptops with postback requests from Firefox or when running the same application with IE8.Sometimes that means that the page address sent is loo long.
Check the link address you are using.
I can't help you further and will send for more help. -
I have InDesign 3 Version 5.0 for Mac. I have a client with a PC who has either InDesign 6 or CC for PC. If I sell him usage rights to my files, will he be able to use them?
...but from what I have read general practice is to charge extra for native files as you are giving over usage rights of the artwork.
Not a lawyer, just been around the block before. It all sort of depends on the client and understandings on both your parts, whether in writing or not. What is their expectation while they were paying you? What was your expectation during the same period? In lieu of an agreement, I think the courts would side on the client's rights.
But regardless, I generally do what Peter wrote unless there is an agreement in writing stating otherwise. One of the reasons why I happily turn over client work is because sometimes the new-hire or new contractor simply doesn't work out and I am often called back into the mix. It's goodwill.
Mike
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