Developing simple web app
Hi,
Really just want to know, I have this task to develop a sime web app that involves a database (to add new records, retrieve data, del, perform queries etc), where there are a number of user access levels. I'm envisioning that users will perform all this via JSP screens, with the input boxes taking parameters.
I'm ok with java but new to all this jsp stuff.... just want to know, will knowledge of jsp and sql queries do in sufficing this task?
Or, is the use of EJB and such other technologies be needed to complete such a task? (I'm on a very short timescale, and given that I already need to learn JSP whilst I do the task, things will be very tight if EJB is a must)
Thanks.
Hi,
Thx for the reply.
I was under the impression that JSP pages could be
created with just HTML and SQL after I saw one JSP
example, where the actual SQL resided in the files.This is true, but it is not looked at like a good thing. It makes the JSP ugly and hard to maintain. Besides, if you write a DB access class, then a JavaBean to represent your Data, you can do a good bit of testing and coding before you have an understanding of JSP. Then you can use the JSP to display the data, and not worry about accessing, scriptlets, where quotation marks go, and things like that... JSP are used for display, if you do your processing and logic in normal Java classes, then JSPs are much easier to work with, especially if you already know java.
>
Just some followup-q's, I'm been looking around and
everyone mentions a web-inf folder... but in the same
example I read, no such thing existed, nor did it
include a single javabean/servletfile (all jsps). I'm
not entirely sure if the example I saw is the full
thing or just including those files accessible to the
user on the client end.... so this may sound stupid,
but is the web-inf compulsory for a web-app?
If so, would you happen to have any good links to
pages teaching this? I've googled this but found a
series of confusing pages.So Web Apps are normally deplyed as a WAR (http://java.sun.com/j2ee/1.4/docs/tutorial/doc/WebApp3.html). The link should describe how the WAR is put together.
Even if you don't package the web app in a WAR, your directory structure should look the same.
Similar Messages
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Seek advices on simple web app
weblogic11g, RDBMS11gr2
skills: PLSQL, and limited in J2EE programming.
I am a DBA for the cust app. I'd like to create a simple web app for our help desk to run a couple of queries against the app's database, and execute a couple of the statements to resolve the issues if found from the queries.
I'd like to deploy the web app war the WL without not requiring additional resources such as named JDBC data sources or JMS queues.
Please advise me what minimum do I have to have to make this simple web app.Hi,
The below URL should help you
http://docs.oracle.com/cd/E18476_01/doc.220/e18479/deploy.htm
Thanks & Regards,
Murali.
============= -
Developing Simple Chat App in ADF
I have JDev 11.1.2.1.0.
Can anyone provide any references to develop a simple chat app?
I want it for:
Two PCs connected together over a LAN.Hi,
You would probably use Active Data Service, see here for an example of a simple Google Talk client: http://www.oracle.com/technetwork/articles/jellema-googletalk-094343.html
Documentation: http://docs.oracle.com/cd/E24382_01/web.1112/e16182/adv_ads.htm#BEIDHJFD
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I am developing an app that will server millions of users. Most of the information coming out of the database won't be of any security concern, but there will be some accounts with financial information that I want more secure. For money reasons, I am
looking at using MySQL for the majority of the Web app and then when I am using a secure connection for money things, using Microsoft SQL Server. Is there anything wrong with that idea?
DCSSRI understand the confusion. I don't want the expense of Microsoft SQL server and was thinking that if I left everything that didn't need to be secure in MySQL, then I could use Microsoft SQL Server free (less than 10 GB) for just billing where security
is more of an issue for me. It might just be me, but I feel more vulnerable using MySQL.
Should I not feel that way?
DCSSR
This is wrong and it is not not professional to throw recommendations regarding a specific system design , while we do not know your system characterization (which is something you can not post in a forum). What we do here is mostly helping in specific question
or just throw comments and general points based on golden rules (rules of thumb). as i wrote before I see no reason of using both MySQL and SQL Server and the new information did not change this.:-)
I can not tell how you should feel, as I dont know you or your system and most important I do not know your developers knowledge/ability. I can tell you that there is no problem in using MySQL regarding security if you do it in the right way. I can tell
you that I would feel great with working with MySQL regarding security (By personally i prefer SQL Server).
* You can think on using NoSQL (as well as MySQL) if u need free database server if the size limitation of 10 GB is the problem. You can use flat database as well for some data.
* If the problem is using 20 GB then I will prefer in most cases to use 2 databases from the same type on using 2 different database server. In this case where I have to choose between using SQLEXPReSS+MySQL or 2 SQLEXPRESS i will probably prefer 2 SQL
EXPRESS databases (in 2001 I had a system with more then 20k users using several MS-ACCESS as databases... It worked great).
I hope this is useful :-)
[Personal Site] [Blog] [Facebook] -
Developed Access Web app on Office 365 - cannot publish it to On Premises SharePoint 2013
I developed an Access Web app, which works fine on Office 365.
Now I want to deploy it to our on premises SharePoint 2013 farm
After I upload the .app package I created from it to our app catalog it shows 'Valid App Package = no':
In the ULS log I found the following:
There were errors when validating the App package: There were errors when validating the App Package. Other warnings / errors associated with this exception: The current version of SharePoint is less
than the SharePointMinVersion specified in the app manifest. CurrentVersion='15.0.4569.1000', SharePointMinVersion='16.0.0.0'
Is there any way that I can work around this, other then recreating the app manually on our on premises farm?Hi,
Please check the SharePointMinVersion in AppManifest.xml file in your Office 365 app and modify it to "15.0.0.0", then deploy the app to SharePoint on-premise.
Thanks,
Dennis Guo
TechNet Community Support
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
[email protected]
Dennis Guo
TechNet Community Support -
Simple Web App NOT working with JBoss on IDEA IntelliJ
Hi Experts:
I am using TOMCAT_4.0.3 (bundled with JBOSS_3.0.0) and using IntelliJ-IDEA as my IDE environment.
On one of my machine I created a WEB-APP kithany.war. It was working fine on this machine.
Later when I copied this kithany.war to other machine and put under server/default/deploy directory and then ran Jboss on which I get following error - wonder why?
13:32:34,078 INFO [MainDeployer] Starting deployment of package: file:/C:/jboss-3.0.0_tomcat-4.0.3/server/default/deploy/kithany.war/
13:32:34,156 INFO [EmbeddedCatalinaServiceSX] deploy, ctxPath=/kithany, warUrl=file:/C:/jboss-3.0.0_tomcat-4.0.3/server/default/deploy/kithany.war/
13:32:34,281 ERROR [MainDeployer] could not start deployment: file:/C:/jboss-3.0.0_tomcat-4.0.3/server/default/deploy/kithany.war/
org.jboss.deployment.DeploymentException: Error during deploy; - nested throwable: (java.lang.NullPointerException)
at org.jboss.web.AbstractWebContainer.start(AbstractWebContainer.java:309) at org.jboss.deployment.MainDeployer.start(MainDeployer.java:678)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:513)
java.lang.NullPointerException
at org.jboss.web.catalina.EmbeddedCatalinaServiceSX.createWebContext(EmbeddedCatalinaServiceSX.java:321)
at org.jboss.web.catalina.EmbeddedCatalinaServiceSX.performDeploy(EmbeddedCatalinaServiceSX.java:238)
at org.jboss.web.AbstractWebContainer.start(AbstractWebContainer.java:300)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:678)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:513)
13:32:34,281 ERROR [URLDeploymentScanner] Failed to deploy: org.jboss.deployment.scanner.URLDeploymentScanner$DeployedURL@6417805a{ url=file:/C:/jboss-3.0.0_tomcat-4.0.3/server/default/deploy/kithany.war/, deployedLastModified=0 }
org.jboss.deployment.DeploymentException: Error during deploy; - nested throwable: (java.lang.NullPointerException)
at org.jboss.web.AbstractWebContainer.start(AbstractWebContainer.java:309)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:678)
WHat is wrong on this...? Any related information on above is appreciated.
THANKS!Hello, manojkithany!
Did you find out what was wrong? I am experiencing this problem with the jboss http-invoker.sar and the jmx-console.war...
Both machines have the same environment. I found this exception with jobss3.04-tomcat bundle as well as with jobss3.06-tomcat bundle.
~~~snip
2003-04-01 17:10:04,122 DEBUG [org.jboss.deployment.MainDeployer] Done with create step of deploying http-invoker.sar
2003-04-01 17:10:04,122 DEBUG [org.jboss.deployment.MainDeployer] Begin deployment start file:/home/tmt/kroh/jcom/app/jcom/dep
loy/http-invoker.sar/
2003-04-01 17:10:04,122 DEBUG [org.jboss.deployment.MainDeployer] Begin deployment start file:/home/tmt/kroh/jcom/app/jcom/dep
loy/http-invoker.sar/invoker.war/
2003-04-01 17:10:04,125 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] webContext: null
2003-04-01 17:10:04,125 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] warURL: file:/home/tmt/kroh/jcom/app/jcom/dep
loy/http-invoker.sar/invoker.war/
2003-04-01 17:10:04,125 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] webAppParser: org.jboss.web.AbstractWebContai
ner$DescriptorParser@1c8efd1
2003-04-01 17:10:04,173 INFO [org.jboss.web.catalina.EmbeddedCatalinaService41] deploy, ctxPath=/invoker, warUrl=file:/home/t
mt/kroh/jcom/app/jcom/deploy/http-invoker.sar/invoker.war/
2003-04-01 17:10:04,220 DEBUG [org.apache.commons.digester.Digester] register('-//Sun Microsystems, Inc.//DTD JSP Tag Library
1.1//EN', 'jar:file:/home/tmt/kroh/www/jboss-3.0.6_tomcat-4.1.18/tomcat-4.1.x/common/lib/servlet.jar!/javax/servlet/jsp/resour
ces/web-jsptaglibrary_1_1.dtd'
2003-04-01 17:10:04,221 DEBUG [org.apache.commons.digester.Digester] register('-//Sun Microsystems, Inc.//DTD JSP Tag Library
1.2//EN', 'jar:file:/home/tmt/kroh/www/jboss-3.0.6_tomcat-4.1.18/tomcat-4.1.x/common/lib/servlet.jar!/javax/servlet/jsp/resour
ces/web-jsptaglibrary_1_2.dtd'
2003-04-01 17:10:04,224 DEBUG [org.apache.commons.digester.Digester] addRuleSet() with no namespace URI
2003-04-01 17:10:04,224 DEBUG [org.apache.commons.digester.Digester] register('-//Sun Microsystems, Inc.//DTD Web Application
2.2//EN', 'jar:file:/home/tmt/kroh/www/jboss-3.0.6_tomcat-4.1.18/tomcat-4.1.x/common/lib/servlet.jar!/javax/servlet/resources/
web-app_2_2.dtd'
2003-04-01 17:10:04,225 DEBUG [org.apache.commons.digester.Digester] register('-//Sun Microsystems, Inc.//DTD Web Application
2.3//EN', 'jar:file:/home/tmt/kroh/www/jboss-3.0.6_tomcat-4.1.18/tomcat-4.1.x/common/lib/servlet.jar!/javax/servlet/resources/
web-app_2_3.dtd'
2003-04-01 17:10:04,236 DEBUG [org.apache.commons.digester.Digester] addRuleSet() with no namespace URI
2003-04-01 17:10:04,242 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] AbstractWebContainer.parseWebAppDescriptors,
Begin
2003-04-01 17:10:04,243 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] Creating ENC using ClassLoader: java.net.Fact
oryURLClassLoader@df0438
### concatenation, always the same ###
2003-04-01 11:09:07,737 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] ..org.jboss.mx.loading.UnifiedClassLoader3@15
db13f{ url=file:/home/tmt/kroh/jcom/app/jcom/deploy/http-invoker.sar/invoker.war/ }
2003-04-01 11:09:07,737 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] ..java.net.URLClassLoader@6e1408
2003-04-01 11:09:07,737 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] ..sun.misc.Launcher$AppClassLoader@7a78d3
2003-04-01 11:09:07,737 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] ..sun.misc.Launcher$ExtClassLoader@929206
2003-04-01 11:09:07,738 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] Linked java:comp/UserTransaction to JNDI name
: UserTransaction
2003-04-01 11:09:07,739 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] addEnvEntries
2003-04-01 11:09:07,739 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] linkResourceEnvRefs
2003-04-01 11:09:07,739 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] linkResourceRefs
2003-04-01 11:09:07,739 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] linkEjbRefs
2003-04-01 11:09:07,739 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] linkEjbLocalRefs
2003-04-01 11:09:07,739 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] linkSecurityDomain
2003-04-01 11:09:07,739 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] Linking security/securityMgr to JNDI name: ja
va:/jaas/http-invoker
2003-04-01 11:09:07,741 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaService41] AbstractWebContainer.parseWebAppDescriptors,
End
##### remark: from here it starts to deviate from normal behavior ####
2003-04-01 11:09:07,744 DEBUG [org.jboss.util.NestedThrowable] org.jboss.util.NestedThrowable.parentTraceEnabled=true
2003-04-01 11:09:07,746 DEBUG [org.jboss.util.NestedThrowable] org.jboss.util.NestedThrowable.nestedTraceEnabled=false
2003-04-01 11:09:07,746 DEBUG [org.jboss.util.NestedThrowable] org.jboss.util.NestedThrowable.detectDuplicateNesting=true
2003-04-01 11:09:07,751 ERROR [org.jboss.deployment.scanner.URLDeploymentScanner] Failed to deploy: org.jboss.deployment.scann
er.URLDeploymentScanner$DeployedURL@ba617c43{ url=file:/home/tmt/kroh/jcom/app/jcom/deploy/http-invoker.sar/, deployedLastModi
fied=0 }
org.jboss.deployment.DeploymentException: Error during deploy; - nested throwable: (java.lang.NullPointerException)
at org.jboss.web.AbstractWebContainer.start(AbstractWebContainer.java:309)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:807)
~~~snap
Olaf -
I'm using Dashcode's browser template for a web app but I'm having trouble navigating through different levels. If I were to put a button on levelOne, how would I have it navigate to levelTwo?
A Servlet is normally there to pre/postprocess requests. For example obtaining a list of records from DB and forwarding the request to a JSP for presentation. Or gathering, validating and/or converting request parameters from a form submit and preparing the result and forwarding the request to a JSP for presentation.
Now, you want to record a voice. If you want to do this with Java, then you'll need to run this at the client machine. As servlets run at the server machine, it can't record the voice, it can at highest only retrieve the voice stream and store it at the database or local disk. To record a voice using a web application, best what you can do is to create a Java applet or Java web start application which you on its turn embed in a JSP page for presentation. The applet or application on its turn can make use of the JMF API to record a voice. Then let the applet or application send the stream to the servlet so that it can process it.
Techniques you'll need to learn about:
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2) AWT and Swing (for UI of applet or application).
3) JSP and HTML (to embed applet or application in web page).
4) JMF (to record voice).
5) Servlets (to process URL requests, the request body may contain the voice stream). -
Simple web app idea - how to implement the servlet?
I want to make a simple web application, that all it does is to allow a user to record his voice, using his microphone, and then save this audio file on my server (maybe allow him to hear it again, later). BUT -
I don't quite understand how it should work - I guess there is a java library to do the recording, that's not a problem, but how can I record via the web??
how can I use the java servlet (which is from the examples I've seen usually displays some new content upon a certain request, nothing more..) to do it?
(I mean. I don't fully understand the communication with the servlet, I think. I know that the servlet has a method for dealing with POST messages, for examlpe. but how can it help me do what I described above?)
hope I made my self clear, thanks :)
Kogan.A Servlet is normally there to pre/postprocess requests. For example obtaining a list of records from DB and forwarding the request to a JSP for presentation. Or gathering, validating and/or converting request parameters from a form submit and preparing the result and forwarding the request to a JSP for presentation.
Now, you want to record a voice. If you want to do this with Java, then you'll need to run this at the client machine. As servlets run at the server machine, it can't record the voice, it can at highest only retrieve the voice stream and store it at the database or local disk. To record a voice using a web application, best what you can do is to create a Java applet or Java web start application which you on its turn embed in a JSP page for presentation. The applet or application on its turn can make use of the JMF API to record a voice. Then let the applet or application send the stream to the servlet so that it can process it.
Techniques you'll need to learn about:
1) Applet or web start application (JNLP).
2) AWT and Swing (for UI of applet or application).
3) JSP and HTML (to embed applet or application in web page).
4) JMF (to record voice).
5) Servlets (to process URL requests, the request body may contain the voice stream). -
How to deploy web app from PC to Linux with Netbeans ?
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FrankRTFM
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To whom it may concern,
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Am I wrong ?
Is there any solution ?
Is 1.1.3 now solving the problem (SVG now supported ?)
thank you for your help
Micheladditional remark:
I made some tests, a vectorized icon could be 30 times smaller (and therefore faster to load) than its ".png" version !
15ko in edge mode = about 1 second to wait ... -
i am thinking of developing a web app for the iphone. if i do not plan on charging for it do i have to go through the approval process? can people start using it immediately. i do realize that it would not be on itunes but that is okay with me.
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No need to do approval process for iphone web apps. But if u want to advertise ur apps on iPhone users through Apple Store then u have to register with Apple Developer Center. -
Building Web Apps on Adobe Coldfusion for Adobe Connect.
I'm looking for resources pertaining to development of web apps such as Widgets using Coldfusion 9 directed for use on Adobe Connect 9. The only resource I'm aware of right now is the Collaboration Builder Toolkit SDK, but that is specifically for development with Flex and Actionscript.
http://help.adobe.com/en_US/connect/9.0/collaborationbuildersdk/connect_9_collaboration.pd f
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