Developing an online web application

Hi,
I'm currently doing my final year project at uni as part of a computer science degree and am designing an interactive breast cancer diagnosis system. At the moment I'm just programming the basic structure including, registration, login,feedback and so on.
I have all the pages of my site and 2 frames for the left and top in html. I've programmed the feedback page using javaMail and have done the login side of things using an xml file which holds the usernames and passwords, a javabean which has the user info, and a jsp page which processes the login etc. For the registration, I've just set up the form, but have not worked out how to check the xml file and add and delete from it.
What I was wondering about is using an architecture. Could anyone give me some guidance on using struts - do I need to use this? Or an MVC model? Or am I OK to go about things the way I'm doing it?
Can I add an architecture in later, or does it have to be implemented before programming starts?
Any help would be greatly appreciated!
Thanks. Naz

Thank you for your reply.
The system doesn't have to be that complicated - but just to show a good understanding of programming concepts.
I'm pleased that I don't have to use struts. I find programming quite hard and it's the main part of the course I don't like incredibly. So to have got this far - for me - was quite an achievement. But then to read about struts - it just looked incredibly complicated!
Could anyone give some advice on using the MVC model? Also, if anyone could recommend any good books, that would be incredibly helpful. I do a lot of learning by using code from here and there and modifying it to suit my application and what I want the code to do. Probably not the best way to program - but it works for me.

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Message was edited by: ace0215

Developing online exam application

Hi,
I want to develop an online exam application using jsp/servlets technologies.Can anyone send me the source code if any for this application or else suggest me the way on how can i do this.
Thanks in Advance,
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You want to develop an application and you're asking for source code? Isn't that just copying an application and changing the author's name?
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Develop iPhone Web applications

This is regarding the article “Develop iPhone Web applications with Eclipse” article posted on "http://www.ibm.com/developerworks/library/os-eclipse-iphone/".
I have refer the article. It would be great if somebody will advise on the below :
Problem - 1: I am trying to develop an iPhone Web Application –(client ) using eclipse IDE( version - 3.3 Europa)
as mentioned in the article :
Setp 3 : Add Aptana to this list by clicking New Remote Site and defining it with a URL of http://update.aptana.com/update/3.2/.
It is not working getting error “Network connection error”. Even when I tried to download the same from the Browser (Safari and FireFox) it is not working .
Is there any other way to download the same from Network – Please Guide .
Problem – 2 :
I also want to use iUI kit for iPhone web application Development .
But I am not able to understand how to proceed for the same .
Does iUI kit work only with Eclipse . If yes is there any specific version which we need to download ?
Please forward the link which gives me details about “How develop web apps for iPhone using iUI kit”
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This is the incorrect forum for that type of information.
I would suggest you direct your questions towards the forums for developers.
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Setup Developer for web application.

Hi all
I am trying set up developer 9i for web application.
I have Oracle 8 client installed on my computer.
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I have downloaded.
Application Server 9i core and developer 6i.
Are they enough to setup the evironment?
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Yes that would be enough.
Install each one in a different Oracle_home.

I need suggestions for an online trading application

Hi,
I am going to develop an online trading application. I have decided to use JAVA EE 5 and I have read "The Java(tm) EE 5 Tutorial". Because I am a (C++) programmer and new to Java, I need suggestions to start development.
Here is summary of the system in my mind. There will be
a database to store user's information and operations,
a web client for creating and managing user accounts,
a desktop application and web client for users for online trading and
an application client for brokers for risk management.
Here is a sample scenario for flow,
- User wants to create an account
- Company creates an account for user
- user gets the prices and trades via application client (web or desktop)
- system informs dealers and broker via their client platform
- broker perform necessary operations.
Java EE 5 Application model fits the system I am trying to develop but I feel I still need some guidance and there are a few things I couldn't figured out yet. For these reasons I want to develop a prove of concept system and this is the system in my mind.
- A simple database
user (user_id, user_login, user_password, user_name)
stock (stok_id, stok_name)
operation (op_id, user_id, stok_id, op_type, op_amount, op_value)
- A price server
will generate random prices and push new values to registered clients
- A web client to create new users (for admin)
- A web client to display operations of users (for user)
- A desktop application and web client for operation entries (for users)
displays prices coming from price servers, sends users trade requests
- A desktop application client for informing admin about trades (for admin)
when a user buys or sells something, this client notified (user buy/sell something)
What do you offer for this sample system?
Which is the best IDE?
Which Application Server should I use (scalability and speed is critical)?
Which Java EE APIs should I use?
JSP or JSF?
Will I need hibernate?
And so on.. I need some points to start and go.
Thanks for any help.
Ahmet

It wouldn't be an arbitrary track. However, maybe you could make an arbitrary track by dividing the track into segments. Each segment is either a straight line or an arc. These are easy to model the cars' behavior on, because you'll have a straightforward way to determine the direction the car should be facing, and the range to the left and right where the car can stray and still be on the track.

From a Technical Architect point of view, how to design a web application?

Hi to all,
I am writing this issue here because I this question is not related on how to program, but on how to design a web application. That is, this question is not related to how to program with the technologies in J2EE, but how to use them correctly to achieve a desired outcome.
Basically I know how to develop a simple web application. I like to use SpringFramework with AcegiSecurity and Hibernate Framework to persist my data. I usually use JBoss to deploy my web applications, however I could easily use Tomcat or Jetty (Since I am not using EJB�s).
However I have no idea on how to develop (or a better word would be �design�) a website which is divided into different modules.
Usually when you develop a website, you have certain areas that are public, and other areas that are not. For example, a company would want anyone on the Internet to download information about the products they are selling, however they would only want their employees to download certain restricted information.
Personally I try to categorise this scenario in to common words; Extranet and Intranet.
But � (and here starts the confusion in my mind) should I treat these two as two projects, or as one project? The content to be displayed on the Extranet is much different then the content to be displayed on the Intranet and definitely clients should not be allowed to the Intranet.
First approach would be to treat them as the same project. This would be perfect, since if the company (one day) decides to change the layout of the website, then the design would change for both the Intranet and the Extranet version. Also the system has a common login screen, that is I would only need to have employees to have a certain Role so that they have access to the intranet, while clients would not have a certain Role and thus they would not be allowed in. But what about performance and scalability? What if the Intranet and Extranet have to be deployed on the different Hardware!?
The second approach is to threat them as two separate projects. To keep the same layout you just copy & paste the layout from one project to another. However we would not want to have two different databases to store our users, one for the employees and the other one for the clients. Therefore we would build a CAS server for authentication purposes. Both the Intranet and the Extranet would use the same CAS server to login however they could be deployed on different hardware. However what if we want to change the design. Do we really want to have to just copy and paste elements from one project to another? We all know how these things finish! �We do not have time for that � just change the Extranet and leave the Intranet as it is!�
The third approach (and this is the one I like most) is to have a single project built into different WAR files. The common elements would be placed in all WAR files. However in development you would only need to change once and the effects would show in the different war files. The problem with this approach is that the project will be very big. Also, you will still need to define configuration files for each one of them (2 Web.config, 2 Spring-Servlet.config, 2 acegi-security.config, etc).
Basically I would like something in the middle of approach 2 and approach 3! However I can identify what this approach is. Also I can not understand if there is even a better approach then these three! I always keep in mind that there can always be more then two modules (that is not only Intranet and Extranet).
Anyways, it is already too long this post. Any comments are more then welcome and appreciated.
Thanks & Regards,
Sim085

Hi to all,
First of all thanks for the interest shown and for the replies. I do know what MVC or Multi-layered design is and I develop all my websites in that way.
Basically I have read a lot of books about Domain-Driven Design. I divide my web applications into 4 layers. The first layer is the presentation layer. Then I have the Facade layer and after that I have a Service layer (Sometimes I join these two together if the web application is small enough). Finally I have the Data Access layer where lately I use Hibernate to persist my object in the database.
I do not have problems to understand how layering a web application works and why it is required. My problem is how to design and develop web applications with different concerns that use same resources. Let me give an example:
Imagine a Supermarket. The owner of the Supermarket want to sell products from the website, however he wants to also be able to insert new products from the website itself. This means that we have two different websites that make use of the same resources.
The first website is for the Supermarket clients. The clients can create an account. Then they can view products and order them. From the above description we can see that in our domain model we will have definitely an object Account and an object Product (I am not mentioning all of them). In the Data Access layer we will have repository objects that will be used to persist the Account and Products.
The second website is for the Supermarket employees. The employees still need to have an account. Also there is still a product object. This means that Account and Product objects are common to the two websites.
Also important to mention is the style (CSS). The Supermarket owner would like to have the same style for both websites.
Now I would not like to just copy & paste the objects and elements that are common to both websites into the two different projects since this would mean that I have to always repeat the changes I make in one website, inside the other one.
Having a single WAR file with both websites is not an option either because I would not like to have to deploy both websites on the same server because of performance and scalability issues.
Basically so far I have tought of putting the common elements in a Jar File which would be found on the two different servers. However I am not sure if this is the best approach.
As you can see my problem is not about layering. I know what layering is and agree with both of you on its importance.
My question is: What is the best approach to have the same resources available for different websites? This includes Class Files, CSS Files, JavaScript Files, etc.
Thanks & Regards,
Sim085

Issue of deploying a fusion Web Application with integrated Weblogic server

Hi,
i'm using Jdev 11.1.1.3.0 to develop a fusion web application, with a model and ViewController Projects.
When i try to deploy this application with the integrated server, i have any issues.
The origin seems to be that it builds an application with 3 profiles. The model application is recognized and deployed as a webapp and not an ADF library as it should be..
[11:00:45 PM] Retrieving existing application information
[11:00:45 PM] Running dependency analysis...
[11:00:45 PM] Deploying 3 profiles...
[11:00:46 PM] Wrote Web Application Module to /home/david/.jdeveloper/system11.1.1.3.37.56.60/o.j2ee/drs/easygestionV2.0/ViewControllerWebApp.war
*[11:00:48 PM] Wrote Web Application Module to /home/david/.jdeveloper/system11.1.1.3.37.56.60/o.j2ee/drs/easygestionV2.0/ModelWebApp.war*
[11:00:48 PM] Wrote Enterprise Application Module to /home/david/.jdeveloper/system11.1.1.3.37.56.60/o.j2ee/drs/easygestionV2.0
[11:00:48 PM] Deploying Application...
<27 déc. 2010 23 h 00 CET> <Warning> <J2EE> <BEA-160195> <The application version lifecycle event listener oracle.security.jps.wls.listeners.JpsAppVersionLifecycleListener is ignored because the application easygestionV2.0 is not versioned.>
<JpsDstCredential><setCredential> Impossible de migrer le dossier/la clé d'informations d'identification et de connexion ADF/anonymous#easygesprod. Raison : oracle.security.jps.service.credstore.CredentialAlreadyExistsException: JPS-01007: Les informations d'identification et de connexion avec la correspondance ADF et la clé anonymous#easygesprod existent déjà..
<TrinidadFilter><init>
java.lang.IllegalStateException: Application was not properly initialized at startup, could not find Factory: javax.faces.application.ApplicationFactory
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     at javax.faces.FactoryFinder.getFactory(FactoryFinder.java:239)
     at oracle.adfinternal.view.faces.util.rich.ConverterValidatorRegistrationUtils.register(ConverterValidatorRegistrationUtils.java:36)
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     at org.apache.myfaces.trinidadinternal.config.GlobalConfiguratorImpl.init(GlobalConfiguratorImpl.java:400)
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     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.init(TrinidadFilterImpl.java:103)
     at org.apache.myfaces.trinidad.webapp.TrinidadFilter.init(TrinidadFilter.java:54)
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     at weblogic.servlet.internal.FilterManager.loadFilter(FilterManager.java:98)
     at weblogic.servlet.internal.FilterManager.preloadFilters(FilterManager.java:59)
     at weblogic.servlet.internal.WebAppServletContext.preloadResources(WebAppServletContext.java:1867)
     at weblogic.servlet.internal.WebAppServletContext.start(WebAppServletContext.java:3126)
     at weblogic.servlet.internal.WebAppModule.startContexts(WebAppModule.java:1512)
     at weblogic.servlet.internal.WebAppModule.start(WebAppModule.java:486)
     at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:425)
     at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:41)
     at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:119)
     at weblogic.application.internal.flow.ScopedModuleDriver.start(ScopedModuleDriver.java:200)
     at weblogic.application.internal.flow.ModuleListenerInvoker.start(ModuleListenerInvoker.java:247)
     at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:425)
     at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:41)
     at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:119)
     at weblogic.application.internal.flow.StartModulesFlow.activate(StartModulesFlow.java:27)
     at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:1267)
     at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:41)
     at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:409)
     at weblogic.application.internal.EarDeployment.activate(EarDeployment.java:58)
     at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:161)
     at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:79)
     at weblogic.deploy.internal.targetserver.operations.AbstractOperation.activate(AbstractOperation.java:569)
     at weblogic.deploy.internal.targetserver.operations.ActivateOperation.activateDeployment(ActivateOperation.java:150)
     at weblogic.deploy.internal.targetserver.operations.ActivateOperation.doCommit(ActivateOperation.java:116)
     at weblogic.deploy.internal.targetserver.operations.AbstractOperation.commit(AbstractOperation.java:323)
     at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploymentCommit(DeploymentManager.java:844)
     at weblogic.deploy.internal.targetserver.DeploymentManager.activateDeploymentList(DeploymentManager.java:1253)
     at weblogic.deploy.internal.targetserver.DeploymentManager.handleCommit(DeploymentManager.java:440)
     at weblogic.deploy.internal.targetserver.DeploymentServiceDispatcher.commit(DeploymentServiceDispatcher.java:163)
     at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.doCommitCallback(DeploymentReceiverCallbackDeliverer.java:195)
     at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.access$100(DeploymentReceiverCallbackDeliverer.java:13)
     at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer$2.run(DeploymentReceiverCallbackDeliverer.java:68)
     at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:528)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
How can i fix the model project to be deployed as an ADf library and not a webapp with the integrated weblogic server ? Because with me it doesn't do it by itself.
Thanks a lot for help

duplicate to Issue of deploying a fusion Web Application with integrated Weblogic server

Call rfc from Java Web application.

Hi:
I am new to SAP Java programming.
I am developing a java web application on SAP NW SP16.
I need to call a rfc and process the data to be displayed on a jsp page.
I have few questions...
1) Can I use the JCO destination created in thru wed dynpro content administrator, to connect to sap and execute the rfc/bapi?
2) How would I create and access the model (rfc)?
3) Are the required jar and dll(rfc32.dll ... ) files available on the server?
Any help would be greatly appreciated.
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Hi,
See the follwoing links which contains sample code to ceate JCO and execute BAPI.
http://help.sap.com/saphelp_nw2004s/helpdata/en/6a/14e13d8ee4535ee10000000a114084/frameset.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/6a/14e13d8ee4535ee10000000a114084/frameset.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/6a/14e13d8ee4535ee10000000a114084/frameset.htm
Kind Regards,
S.Saravanan.

Best way to manage images on jsp web application

Hi,
Am developing a jsp web application, in that project, the user will upload the image files, now I created an image directory in the context root and when the image is uploaded by the user it is saved in the /images directory and the image path is saved in the database. I can display this image using the <img src="images/a.jsp" > tag.
but when I rebuild the project all the images in the /images directory get deleated but the image path is remained in the database, is there any method that I make /image dir outside my project context root so that when I rebuild the project the /images dir can get changed and my project will save images outside the context root that is in the /images dir which is now outside the project context root. and is it possible to display those images using <img src""> tag. because this time my /images dir is at D:/images . what could be the best method or way to handle images with the web application.
any suggestion will be helpfull

Well my friend as per your given case there are to two ways of approaching your problem.
Case 1:
How to save the relevant data ??
.Create a backup folder Workstation on which you are hosting your application where you can store all the uploaded files which is outside the scope of webserver(However we can write a dedicated servlet which can access that file) and make sure we pickup from any the folder path from a specfic MessageResource bundle or an context/servlet init parameter in web.xml.
.Write a Upload servlet/Backing Bean which saves all the files in the discussed folder using utility packages like Commons FileUpload,Oreilly MultipartRequest & etc and then register saved fileName in the database user specfic table specific to user.
How to display the Image ??
.Write a dedicated servlet which can pickup user related fileName specfic information from the database and the read the file from backup folder by constructing the path from the entry made as a init param in web.xml or any other custom MessageResource bundle and then stream the Image data using the ServletOutputStream.
NOTE: do not forget to pickup & setImage file ContentType & Set the content length.
.Just try to render the JSP view file where we are displaying the displaying the images by calling the dedicated ImageServlet.
<img src="ImageServlet?userid=2345" align="center"/>Try to refer below posts to get a better understading.
Dedicated Image Servlet:
http://forum.java.sun.com/thread.jspa?threadID=5208858&messageID=9840042#9840042
Uploading Files Using Servlet:
http://muimi.com/j/jakarta/commons/fileupload/
Case 2
The second method would more or less the same but here we would save the uploaded file
content is saved in the Database as a Blob and we would retrive it back using a dedicated image servlet again.
However,in terms of performance the second case implementation is very costly.
Try to refer below posts to get a better understading on the second case.
http://forum.java.sun.com/thread.jspa?threadID=5193481&tstart=50
http://forum.java.sun.com/thread.jspa?threadID=5211649&messageID=9853670#9853670
Hope this might help :)
REGARDS,
RaHuL

How to use servlets in portal web application in Weblogic Portal 4.0

We are developing a Portal Web application using Weblogic Portal 4.0 where in we
have the following scenario. one JSP in webflow of a portlet calls the PipeLine
which does some processing and calls the servlet which is having the typical download
functionality. The servlet is supposed to read the data from the pipeline session
and create a CSV String that is dumped to the client browser. The problem is even
we are doing response.setContentType("application/save") in the servlet it is
still displaying the content as html in the portlet. I guess since all our request
are send to the webflow contolling servlet and it is setting the content type
and hence our servlet is not working. How do I solve this problem? Thanks Yogesh

Hi Renu
Please go through the SAP Content Management here you find the documents related to Wab page Compoer and knowledge mangement. Also search for article / blog for more details.
[http://www.sdn.sap.com/irj/sdn/nw-ecm|http://www.sdn.sap.com/irj/sdn/nw-ecm]
Hope it will helps
Best Regards
Arun Jaiswal

Web application for Daigrams

Hi everyone,
I 'll appreciate if somone could answer my question or give me any ideas.
I have developed a desktop application using JGraph project library in order to draw uml graphs,ER diagrams.
I want to develop it as web application now.
Cause i am new to JSP technology but with background of ASP programming,does anyone know if there is a tag
library for diagrmas or a an open source project in order to get it done?
Any resource hints or ideas will be appreciate it
Thanks in advance
Chris

Sorry, I cannot answer your question, but was interested to know how your diagrams are outputted.
If you can get your classes to output to an image file, you could call the classes from JSP, then re-read the image back into a subsequent jsp/html page.
If it is possible to output to an image file, you would not have to re-engineer the whole thing.

Design considerations while accessing data of a different web application

I am database developer for a web application (*WebApp1*) which supports around *6 million* merchant data across various tables in database (*DB1*).
The users for the above mentioned application are less, around *50* who monitor the 6 million merchant data.
Now a proposal has come up to develop a second web application for the merchants themselves.
Thus the user base for this web application (*WebApp2*) is in millions.
Now the requirement for WebApp2 is :
On each login of individual merchants, they need to see their individual data (mostly read-only) which is stored in (*DB1*)
along with other data which is stored in its own database (*DB2*). WebApp2 will have other functionalities too but those
are independent of WebApp1.
Now I can think of three approaches how to display DB1 data in WebApp2 :
1. Creating a stored procedure and accessing DB1 data through dblink. (*Cons* - have seen access through dblink is slower as it serializes access).
2. Replicate DB1 data to DB2 through batch jobs running every night. (*Cons* - Will store the same data in 2 places and will have the headache of data sync.)
3. WebApp1 will expose webservice using DB2 data, so that on each login, WebApp2 users use the webservice to display DB1 data through webservice.
(Please answer if there are any cons. beacuse of high user base ?)
Need your suggestion and views. Also if there are any other way please let me know.
Will it depend on any other factor ? Let me know if you need any further information.
Cheers !!!

Ah - this is a much bigger question! And may be outside the scope of this forum to answer. I will have a go though.
The question really isn't can the database support 6,000,000 users. It is how many of the users will be making database requests at the same time, what is the average elapsed time of each request, and what do your users regard as an acceptable response time to each request?
To use a (very) simple analogy, my company employs 30,000 people but the IT Service Desk that they call if they have a problem with their PC is only staffed by 30 people. This is because the Service Desk Manager has estimated that at any one time only 1% of all employees will need to call the Service Desk. On average each call takes 6 minutes to resolve and the response time agreed with the business to a call is 1 hour. So within an hour one Service Desk technician can answer 10 calls in an hour, so 30 technician can answer 300 calls an hour.
Now you can apply this analogy to a computer system. The scalability of database systems is generally limited by the amount of available CPU. If we determine that the average database call uses 10ms of CPU, and the user will accept a response time of 1s, then each CPU can service 100 database calls within that response time. Multiply that by the number of available CPUs and you have a (very rough) idea of how far the database will scale. An server with 8 cores could support 800 concurrent requests. A cluster with 4 servers each with 8 cores could support 3200 concurrent requests.
I would stress that this is very crude. Much more information would be required to determine what the limits of database scalability were. My example does not take account of other source of potential latency, such as the network or the storage subsystem if requests involve significant physical I/O. Or indeed the latency in the application itself.
So, you need to answer these questions:
- How many concurrent database requests need to be supported
- What is the average amount of database CPU that each database request will consume
- What is the maximum acceptable elapsed time for each database request
On a more practical note, your application must use some form of connection pooling to limit the number of database connections required to service all the required database activity. You can scale the database horizontally using RAC and in extreme cases you can offload read activity entirely from the database using a middle-tier caching solution such a Coherence, GigaSpaces or GemFire.
That's probably enough for now. Any more and you'll probably need to get some consultancy!

Communication b/w two web applications

Hi ,
I am developing an online payment application in which i need to send the payment details like amount,account no and name to bank application.As i never dealed with such applications i could n't understand how to do this securely.can anybody explain ?it will be more helpful to me.
thanks in advance

Hi,I'm just developing the payment platform as you,and i just response for the communication with different banks.
For an individual bank,it should provide you some APIs(with Java or C or Com),which used to encrypt,decrypt the transfer message using public-private key and digital signature.
So you should care about that.

Easy web application tool for database access

Hi Experts,
I am a ABAP developer and not a web application developer. I want to learn to create web application using databases.
Considering I am not a web application developer; which tool in the market do you think is the best to start learning?
Which is the best shareware? Is there any graphical interface tool?
All advices would be helpfull. <REMOVED BY MODERATOR>
Thanks,
Franc
Edited by: Alvaro Tejada Galindo on Jul 22, 2008 12:14 PM

Hi Gregor,
Thanks for the reply,
I was wondering would it be possible to host the web application developed by web dynpro independent of the SAP software? What I mean is, say if I want to develop a small web application like adress book using a SQL database, would it be possible to develop it using the web dynpro without having to host SAP software?
Thanks,
Franc

Developing an online web application

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