Web application in Java

Hello all,
I need to develop a web application in java that will take MS excel files as input and generate output in excel format as well. Since I am not very experienced in java I am not sure what framework should I be using. Can I develop the user interface using JSwing and use servlets to make it available on web? Will appreciate any help.
Thanks.

You wouldn't need to use Swing. You could create your own Swing front-end (and access the web tier as a web service rather than a web app) but it wouldn't be necessary, and it would probably be too much work.
How is this even a web application? If you're going in with a desktop app file and coming out with a desktop app file -- why and how do you feel that the web even needs to get involved?

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Hi,
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java.lang.NullPointerException
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any help will be so helpful for me... Thanks in advance, have a nice day
Thanks
Sharath.

Let's say your Weblogic domain for Contract Management is located in
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Error on the installation of Web Application Server Java 6.40 SP9 on my PC

Hi, All,
I got the following error when I try to install Web Application Server Java 6.40 SP9 on my laptop using the CD that comes with the Book 'Java Programming with the SAP Web Application Server'. I'm currently using window XP.
The installation failed on the 3rd step 'SAP System Installation'.
I logged on my laptop as my own userid, but I should have the administrator's rights.
ERROR 2007-05-15 15:43:10
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Joanna

Thank you all for your replies. I downloaded the newest version of Netweaver from the SAP website and got it installed successuflly. Points rewarded...Thanks.
Joanna

SAP Web Application Server Java 6.40 download is not working

SAP Web Application Server Java 6.40 is not working. There seems to be an issue with the server hosting the binaries.
Antoine Voiry

try this site
The SAP WAS 6.40 SP9 is in for of a zip file "WebAS640SP9.zip" it is about 1 GB
https://www.sdn.sap.com/sdn/downloads.sdn?page=webas640_sp9_maxdb_download.htm
Also you can go to the site
https://www.sdn.sap.com/sdn/downloadarea.sdn
and select "SAP NetWeaver Enterprise Portal on MaxDB, Developer Edition Sneak Preview"
to download it
Cheers
Sai

How to make web applications in JAVA

Hi!
Iam an experienced Web Programmer in languages like PHP,CGI,ASP but i haven't drunk my first cup of JAVA yet. My idea is to start making web applications in JAVA as soon as possible. But the first challenge i am facing is of choosing from things like J2SE,J2EE,J2ME. I just bought a book 'JAVA : The complete reference(J2SE 5.0)' by Herbert Schildt. It has a only a small percentage of text that looks like 'Web Programming' in the chapter 'java Servlets'. So now I think its J2EE that has all the web programming stuff. So basically iam confused and can't figure out what to read! So can anybody please tell me that what learning curve do i have to take to start java web programming? Remember, i hardly have any Java specific knowledge. But iam adept at OOPS programming(thanks to PHP).Do i have to learn that whole J2SE book if j2EE is what i need?And i don't really bother about syntax of JAVA language coz i have worked on C as well. Infact, PHP is much like C as well.
Thanks for any Help

I will once again clarify what i am sayin to avoid any confusion...
PHP is an object oriented server side scripting language.
PHP has its own semantics and OOPS defination. unlike ASP it is not dependent on other languages to execute the logic of script.
PHP has it's own PARSER. The function list of PHP is also impressive. The OOPS are pretty strong, some things are missing like Function overloading etc.
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You can go to http://php.net and make a search on available functions and features of PHP in the online manual.
thanx.

[HTTP:101216]Servlet: "OnlineReserveren" failed to preload on startup in Web application: "Ruislip_Webservices". java.lang.IllegalStateException

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Web Application and Java Application

Hello,
I have a standalone Java application and a web application (JSP/Servlets) that I would like integrate. The standalone app. should send some information to my web app (which is not a problem), but then the user can be at this web app. for a while and then once he sees something he likes here, he can select it which should take him BACK to the standalone application. My question is whether something like this is possible?
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Also the web app and the standalone app run to 2 separate machines and 2 different JVM's.
Any kind of help will be great.
Thanks

Well let me describe the scenario in detail
We have a standalone java application that is good to search for data across an enterprise database. We also have another application which is web based and uses jsp's and servlets and is good for displaying data in different ways, let's say different kind of graps. Now the user will typically search for something using the standalone application and once he finds what he is looking for, then he might say that he wants to graph the selected data using this web application. Now this part is not too difficult as the standalone app can simply POST the selected information to the web app and the web app can then plot the graph. However, the tricky part is that this web application has the capability to allow the user to select let's say a bar and then get additional info. on that bar. Now to get this additional info. the web app. must contact the standalone app and tell it what bar was selected to get the additional info.
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Installation of SAP Web Application Server Java 6.40 SP9 (SAP Press)

I wanted to install the Net WeaverDeveloper Studio and Development Infrastructureprovided on the CD (SAP PRESS) SAP Web Application Server. After starting the installtaion prcedure from the CD I get following message:
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WARNING 2006-08-15 12:47:25
Error 5 (Zugriff verweigert
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WARNING 2006-08-15 12:47:25
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Thanks

Halo Mikael,
I haven't installed anti-virus functionality. In the meantime I could install the DB as well the NetWeaver seperately which doesn't help me further because I don't get any conection to the WebAs fro deployment. I get following message while trying to deploy:
Deployment exception : Cannot determine sdm host (is empty). Please configure your engine/sdm correctly !
I don't know where the engine has been installed and how to configure it.
If Itry to configure the eingine via WIndow>Preferences> SAP J2EE engine : engine installed on localhost ; then I get the following message:
No local engine could be found.
No systemcould be found under
Pal-Singh
sapmnt.
It's realy very frustrating. Could you please help me to get further?????????
Thanks with best regards.

Bex Web Application designer - Java communication error

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Emily,
use my blog which will really help you understand the communication flow and help you resolve your issue !!
restarting is not even an option in this case as the problem still exists and the way to determine the problem is described in my blog
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The Cloak and Dagger about Portal and BI Connectivity
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Sample questions on SAP NetWeaver-Web Application Develpment certification

hello frnds,
can i find any sample questions on
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hi Sobhan
Please try on
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Handling multiple events in web application

We are converting a window application to a web application. We are facing an issue while implementing the web application with Java on front end and Oracle DB in back end. Consider a field with a car registration number which needs to be verified if it exists in the DB and fetch the remaining values related to the car and display it. At the same time we also need to save the car registration number in the form (displayed in the browser) so that other operations (such as invoicing) can happen on the car. We have a constraint that we cannot touch any of the server procedures in the DB (which handles all DB calls) but could only play with the functions in the UI.
Now the verification of the reg. no. happens whenever we go 'out of focus' from the text box where the reg.no. is written. However, if the user presses 'save' button to save the reg.no., verification should also occur and data should be saved. Now the problem we are facing is that on pressing the save button, two events are occurring simultaneously - 1. textbox with reg.no. is getting 'out of focus' and 2. save button is getting pressed resulting in verifying the reg.no. again. Due to this two events happening simultaneously, one or other method is failing leading to the car reg.no. not getting verified and saved as it should be.
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/Mayank

Hi,
Your assumptions are all correct. Indeed there is Javascript code executing on focus change and AJAX is doing the validations by inturn calling an oracle procedure through some Java rountine. The two requests are overlapping and hence blocking the complete execution of either, leading to the validation not taking place at all.
The webpage gets refreshed everytime an event occurs and thus the next event can take place only after the page has refreshed once (after completing all the validations linked to that event). The problem is occuring since the page is not getting time to refresh. With simultaneous execution of 2 events, the validations related to 'Out of focus' remains incomplete before the 'save function' starts. I am constrained not to put the validation related to 'Out of Focus' in the beginning of 'save' event since that would alter functionality of the 'save' event. Again, I am not allowed to change any of the server procedures on the DB side and have to pass exactly the same i/o parameters for it to function properly.
What I am trying to find is: Whether it is possible to find out (using some global variables) that when the 2 events are happening simultaneously, their functionalities could be combined and serialized in just one refresh of the webpage. and how?
I am trying to get this project done by Java resources and am myself not very technical with Java. If a solution exists and I get to know it exists, I can guide the programmers to try out the approach that come up.
Thanks so much :)

Jdev 11g "WSEE_SERVLET" failed to preload on startup in Web application

Hi,
if I create a new EJB project, add an Entity and session bean, annotate that bean as @WebService and try to run it, I get the following error:
[HTTP:101216]Servlet: "WSEE_SERVLET" failed to preload on startup in Web application: "/WsBean".
java.lang.NullPointerException
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     at weblogic.wsee.wsdl.WsdlExtensible.parse(WsdlExtensible.java:98)
     at weblogic.wsee.wsdl.WsdlDefinitions.parse(WsdlDefinitions.java:468)
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     at weblogic.wsee.wsdl.WsdlDefinitions.parse(WsdlDefinitions.java:389)
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     at weblogic.wsee.jaxws.framework.jaxrpc.EnvironmentFactory.buildDeploymentContext(EnvironmentFactory.java:581)
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     at weblogic.wsee.jaxws.WLSTubelineAssemblerFactory$TubelineAssemblerImpl.createServer(WLSTubelineAssemblerFactory.java:74)
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     at com.sun.xml.ws.server.EndpointFactory.createEndpoint(EndpointFactory.java:217)
     at com.sun.xml.ws.api.server.WSEndpoint.create(WSEndpoint.java:467)
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     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
     at weblogic.security.service.SecurityManager.runAs(Unknown Source)
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     at weblogic.servlet.internal.StubLifecycleHelper.createOneInstance(StubLifecycleHelper.java:58)
     at weblogic.servlet.internal.StubLifecycleHelper.<init>(StubLifecycleHelper.java:48)
     at weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.java:521)
     at weblogic.servlet.internal.WebAppServletContext.preloadServlet(WebAppServletContext.java:1893)
     at weblogic.servlet.internal.WebAppServletContext.loadServletsOnStartup(WebAppServletContext.java:1870)
     at weblogic.servlet.internal.WebAppServletContext.preloadResources(WebAppServletContext.java:1790)
     at weblogic.servlet.internal.WebAppServletContext.start(WebAppServletContext.java:2999)
     at weblogic.servlet.internal.WebAppModule.startContexts(WebAppModule.java:1371)
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     at weblogic.wsee.deploy.WseeWebappModule.activate(WseeWebappModule.java:146)
     at weblogic.wsee.deploy.WSEEEjbModule.activate(WSEEEjbModule.java:371)
     at weblogic.wsee.deploy.WsEJBDeployListener.activate(WsEJBDeployListener.java:52)
     at weblogic.ejb.container.deployer.EJBDeployer.activate(EJBDeployer.java:1329)
     at weblogic.ejb.container.deployer.EJBModule.activate(EJBModule.java:476)
     at weblogic.application.internal.flow.ModuleListenerInvoker.activate(ModuleListenerInvoker.java:107)
     at weblogic.application.internal.flow.DeploymentCallbackFlow$2.next(DeploymentCallbackFlow.java:411)
     at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:37)
     at weblogic.application.internal.flow.DeploymentCallbackFlow.activate(DeploymentCallbackFlow.java:74)
     at weblogic.application.internal.flow.DeploymentCallbackFlow.activate(DeploymentCallbackFlow.java:66)
     at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:635)
     at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:37)
     at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:212)
     at weblogic.application.internal.EarDeployment.activate(EarDeployment.java:16)
     at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:162)
     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:140)
     at weblogic.deploy.internal.targetserver.operations.ActivateOperation.doCommit(ActivateOperation.java:106)
     at weblogic.deploy.internal.targetserver.operations.AbstractOperation.commit(AbstractOperation.java:323)
     at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploymentCommit(DeploymentManager.java:820)
     at weblogic.deploy.internal.targetserver.DeploymentManager.activateDeploymentList(DeploymentManager.java:1227)
     at weblogic.deploy.internal.targetserver.DeploymentManager.handleCommit(DeploymentManager.java:436)
     at weblogic.deploy.internal.targetserver.DeploymentServiceDispatcher.commit(DeploymentServiceDispatcher.java:163)
     at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.doCommitCallback(DeploymentReceiverCallbackDeliverer.java:181)
     at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.access$100(DeploymentReceiverCallbackDeliverer.java:12)
     at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer$2.run(DeploymentReceiverCallbackDeliverer.java:67)
     at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:516)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Any ideas why?

hi
This could be confusing without a more specific reference. Looks like it is about this:
"Oracle XDK specified in weblogic-application.xml will cause JAX-WS to fail to deploy (7424247, 7436727)"
http://www.oracle.com/technology/products/jdev/htdocs/11/knownissues.html#wsd11
"+If you create any ADF components ... any code deployed in that application will use the oracle xml parser rather than the default weblogic one ...+"
regards
Jan Vervecken

"AppManServlet" failed to preload on startup in Web application: "eas"

Hi Everyone,
I have a problem with the EAS deployment, I have a distributed installation two HPUX Risc servers, one have the oracle database with the two repositories one for shared services and the other for eas, in the other server we have the Shared Services, EAS and Provider Services with a Weblogic 9.2.4, In the other Hand we have another server HPUX Itanium with Essbase Server, I make a manual deployment, everything works fine with all application except eas, when I put the eas application to service all request I get the next error:
java.lang.UnsatisfiedLinkError: no environmentjni in java.library.path
The complete stacktrace is
[HTTP:101216]Servlet: "AppManServlet" failed to preload on startup in Web application: "eas". java.lang.UnsatisfiedLinkError: no environmentjni in java.library.path at java.lang.ClassLoader.loadLibrary(ClassLoader.java :1709)
at java.lang.Runtime.loadLibrary0(Runtime.java:822)
at java.lang.System.loadLibrary(System.java:993)
at com.essbase.eas.utils.Environment.<clinit>(U nknown Source)
at com.essbase.eas.server.AppManServlet.init(Unknown Source)
at javax.servlet.GenericServlet.init(GenericServlet.j ava:256)
at weblogic.servlet.internal.StubSecurityHelper$Servl etInitAction.run(StubSecurityHelper.java:278)
at weblogic.security.acl.internal.AuthenticatedSubjec t.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(Se curityManager.java:121)
at weblogic.servlet.internal.StubSecurityHelper.creat eServlet(StubSecurityHelper.java:64)
at weblogic.servlet.internal.StubLifecycleHelper.crea teOneInstance(StubLifecycleHelper.java:58)
at weblogic.servlet.internal.StubLifecycleHelper.< init>(StubLifecycleHelper.java:48)
at weblogic.servlet.internal.ServletStubImpl.prepareS ervlet(ServletStubImpl.java:517)
at weblogic.servlet.internal.WebAppServletContext.pre loadServlet(WebAppServletContext.java:1727) at weblogic.servlet.internal.WebAppServletContext.loa dServletsOnStartup(WebAppServletContext.java:1704)
at weblogic.servlet.internal.WebAppServletContext.pre loadResources(WebAppServletContext.java:1624) at weblogic.servlet.internal.WebAppServletContext.sta rt(WebAppServletContext.java:2789)
at weblogic.servlet.internal.WebAppModule.startContex ts(WebAppModule.java:889) at weblogic.servlet.internal.WebAppModule.start(WebAp pModule.java:328) at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleS tateDriver.java:204) at weblogic.application.utils.StateMachineDriver.next State(StateMachineDriver.java:26)
at startEPMSystem.shternal.flow.ModuleStateDriver.start(ModuleSt ateDriver.java:60) at startEPMSystem.shternal.flow.ScopedModuleDriver.start(ScopedM oduleDriver.java:200) at
I hopu you could help me out.
Regards

I am facing the similar issues. Pls let me know if know the solution.
- Ap

"StartupServlet" failed to preload on startup in Web application: "exponlin

I'm receiving this error message since I install first time the WebLogic and Primavera Contract management 13.1.
Do you know why I could star the exponline....????
####<Feb 16, 2012 10:07:21 AM GMT-05:00> <Error> <HTTP> <Grecia-Pre2> <AdminServerPre2> <[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1329404841807> <BEA-101216> <Servlet: "StartupServlet" failed to preload on startup in Web application: "exponline".
java.lang.NumberFormatException: null
     at java.lang.Integer.parseInt(Integer.java:417)
     at java.lang.Byte.parseByte(Byte.java:151)
     at java.lang.Byte.parseByte(Byte.java:108)
     at com.primavera.exponline.common.base.CommonUtilities.init(Unknown Source)
     at com.primavera.exponline.servlet.StartupServlet.init(Unknown Source)
     at weblogic.servlet.internal.StubSecurityHelper$ServletInitAction.run(StubSecurityHelper.java:283)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
     at weblogic.servlet.internal.StubSecurityHelper.createServlet(StubSecurityHelper.java:64)
     at weblogic.servlet.internal.StubLifecycleHelper.createOneInstance(StubLifecycleHelper.java:58)
     at weblogic.servlet.internal.StubLifecycleHelper.<init>(StubLifecycleHelper.java:48)

This is an error that can be cause fore many reasons. There is a knowledgebase article about it. [ID 1332267.1] Most of the time it's because the jdbc connection in weblogic don't match exactly the db connections in the exp admin.cmd .
Thanks,
Jonathan Johnson

Web application in Java

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