Using Application Scope Javabean to hold data?

I have a set of (4000) records I would like to store in a Javabean to be used within mutiple JSPs. I am using JSP and Javabeans, no EJBs. My question is should I use Application scope for the Javabean to be shared for all the JSPs instead of a Sesstion scope to limit stress to the server? Thanks.

I think use session scope. Application scope may tie up resources u might not need. That is my personal opinio though.

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Object scope: using application

Hi
I would like to know how a bean is stored in the servlet when u use application scope.
When using session it would be:
session.setAttribute("key", key1); In the JSP it would then be session.getAttribute("key");
how would this be done for application scope?

Hello. Same thing actually.
Do:
application.setAttribute("myInfo", myInfo)
and
MyInfoClass myInfo = (MyInfoClass)
application.getAttribute("myInfo");
As rhibiscus rightly stated, you can use the application implicit reference in a JSP. For a servlet, use the getServletContext() method to get a reference to the application scope.
e.g.
ServletContext context = getServletContext();
context.getAttribute("myInfo");

Best Performance? - having a single stateless java pojo as delegate- give it application scope?

I'm curious about which is best from a performance standpoint - All of our flex calls access a single java pojo. In my remoting-config.xml I'm currently declaring the destination a property scope of 'application': <destination id="UIServicesDelegate"> <channels> <channel ref="my-amf"/> <channel ref="my-local-amf"/ </channels> <properties> <factory>spring</factory> <source>uiServicesDelegateBean</source> <scope>application</scope> </properties> </destination> All of the UIServiceDelegate methods are stateless however, so I'm wondering if I'm gaining anything by giving it scope session. Since their all stateless I"m assuming application scope would be the best from a performance standpoint? I'm assuming in this case only one object will ever be instantiated? Assuming it was between Session and Request scope, is there a lot of overhead instantiating the new server side object each time? I would assume performance would be better using the Session in this case, with the only draw back of some server-side ram being chewed up storing the object in the Session. If you want "singleton" type approach, I figure just using application scope is the preferred approach?

You wont get any api for directly accessing Servlet application objects from any ejb. I dont think MDB either solves your problem directly. Indirectly you can place a request to some servlet (should be there for each JVM and web application ) and update your application scope variable. I would suggest you to cache the data in database if the size of cache is large. otherwise any open caching tools may help you.

Always used 1 main account. Started using individual user accounts. So how do I use software or applications with a lot of data like Quicken under my own user account?

I recently upgraded our family's mac to OS X. I thought this was the perfect time to create and use "user accounts". We had always used 1 main account. So how do I use software or applications with a lot of data like Quicken under my own user account? I wanted to be able to manage my own itunes library, iphone apps, messages. But I still really need to use the Stuff I have in Quicken essentials. I don't want to have to restart all my work done in Quicken already.

I haven't used Quicken in a while, but most applications store your files in your Documents folder. Is that where your Quicken data file is? What you do next depends on how many family members need to get at that data.
If multiple family members need to use the Quicken data file, try moving it to the Documents folder in the Shared account. That is an account that all accounts can see. It's at the same level as the other accounts. In other words, Shared is one level up from your Home account, or Hard Drive/Users/Shared.
If you're the only one allowed to see that Quicken data, move the Quicken data file from the old main account to your account, and don't leave a copy behind. You can use the Shared folder as a way station for the transfer since you won't be able to see both accounts' Documents folders at the same time (because you're not allowed to peek into other people's accounts). Or you can use another disk or server for the transfer, as long as you can get to it when logged into either account.

What are the pros and cons of storing heavely used CFCs in the application scope?

I've been storing all the required CFCs for a site in the application scope. During onApplicationStart I do something like this application.objSomeCfc =CreateObject('component', 'com.someCfc').init().
Here is my reasoning.
Get the CFCs initialized once and stored in memory for better performance.
Using CreateObject several times on each page load can have a negative impact on performance.
Having one place to create application scoped CFCs makes it easier to manage code.
So is my thinking flawed? Are there any additional pros or cons for dealing with CFCs? Is there any docs, articles, blogs, videos, frameworks, ...... that I should check that may change my perspective on how I'm doing this?
Thanks

Your approach is fine, depending on how many and what type of CFCs you are talking about. If they are "singletons" - that is, only one instance of each CFC is needed to be in memory and can be reused/shared from multiple parts of your application - caching them in the application scope is common. Just make sure they are thread safe ("var" or local.* all your method variables).
You might consider taking advantage of a dependency injection framework, such as DI/1 (part of the FW/1 MVC framework), ColdSpring, or WireBox (a module of the ColdBox platform that can be used independently). They have mechanisms for handling and caching singletons. Then you wouldn't have to go to the application scope to get your CFC instances.
-Carl V.

Is that a good practice to use syncronize methods for application scope cls

Is that a good practice to use synchronize method in a application scope class, so I have a doubt, there a is class A, it has application scope and it contains a synchronized method add, so because of some network traffic or any unexpected exception client1 got stuck in the method, will that add method available for any other client...?
Edited by: navaneeth.j on Dec 17, 2009 4:02 AM
Edited by: navaneeth.j on Dec 17, 2009 4:04 AM

If it needs synchronization, then it probably doesn't belong in the application scope. Either keep it as is, or reconsider the scope, or make it static.

Using RFC Function Module to send data to NON SAP Application

Hi friends,
Please guide me how can I send data from SAP -> Dotnet Applcation using Dotnet Connector through RFC function module from SAP side. In my scenerio, I Run Z transaction to executte RFC function module which create some data to pass to dotnet connector.
Regards,
Rajesh Kumar

Hi,
You can make use of Dotnet connector to read the content of SAP RFC .. (eaiest of all)
The RFC can be executed using connector , and can read the data simultaneously.. u need to code in dotnet for this..
else create a webservice and read it from dot net ..
Regards
Renu Gusain
Edited by: Renu Gusain on Jan 25, 2010 12:55 PM

Using user hold data function in FB65

Dear Guru's
In FB65, I input amount, gl account, amount in doc currency, calculate tax tax box and tax type. Then I select Hold data function. When I exit FB65 and re-enter again, all saved data is available except for the calculate tax tick box and tax type.
Is there anyway to get this hold as well?
Regards
Shakeer

Hi,
This is standared functionality when you process final account document from Hold Doc user should Select Tax & Process the same.
Clear Information about Hold Doc
"With Hold Document, data which has been entered can be saved temporarily in order to continue the entries at a later time. Documents held by the system do not have to be complete. No account balances are updated and the data of the
document is not available for evaluation. No document number is assigned. The person making the entries is asked to name the document after selecting the Hold Document function. The document can be found under this name at a later time."
Regards
Viswa

Application scope bean Vs. EJB

I want to cash some application data - and was thinking of using a singleton bean with application scope in my controller and JSP page.
<jsp:useBean id="myBean" scope="application" class="bean.datacash" />
I am not very familiar with EJBs - and wanted to know if it would be a mistake not to use an EJB to perform that task.
Is there a downside to my approach?
Thanks for any insight
Mike

Entity EJB'S are used as a kind of data persistence, mostly to Databases. In a way it's like a kind of cache but any changes you make to an EJB are usually persisted to the underlying data storage on a regular basis.
Session EJB's are more for business logic and depending on the type of Session Bean you use can either remain persisted in a session state or used and thrown away.
EJB's also require alot of code so depending on your application requirements it is kind of a big decision.
Is the data your wanting to cache to be shared by all users using the application? Are there any race conditions that may be met by concurrent access to the data? What do you plan to do with the cached data store it in a database or just make it available to share?
If you want to look into using EJB's then your going to require an EJB Container to run them in (this can be standalone like OpenEJB or as part of an J2EE Application server like JBoss or Oracle Application Server to name just a couple).
Using the Singleton Javabean can keeps things simple but once you start to synchronize methods with multiple users you can find some slowing down of the logic as the singleton tries to complete a request before getting onto the next.
The [url http://jakarta.apache.org]Jakarta team offer a package called commons pooling which is designed as a pooling framework (also a way of caching) that can come in handy, I've used it to create a custom JDBC Connection pooler and it works quite well when you get the hang of it.
Another thing to consider is the load the application may be under at it's busiest time. How many concurrent users do you expect to access the application?
Sorry I can't give you a real answer as that is entirely up to you and your requirements. If you have a small app that has around 20-50 users then EJBs are bit of an overkill. If you find you'll have 100+ users with lots of data to manage then EJB's are probably a good option.
If you have a look at [url http://www.theserverside.com]the serverside web site you may find a couple of articles on data persistence or check out some of the online magazines which also have articles on this same topic.
Anthony

Application scope objects(opinions wanted)

Hi All
Looking for educated opinions on the pros/cons of application scope objects. I am thinking about creating a read-only application scope hashmap representation of some static data in my database. When queried at the database level it can cause relatively long delays (3-4 seconds) and sometimes must be stored in many sessions on the server. I am thinking just one read-only object stored at app scope will cut down on the waste of memory, as well as skyrocket the speed of retrieving this data.
Please give me your opinions!!! I can tell you a little more about the app if you need more info to make an educated statement...
Thanks
Greg B

You can use the Properties Object for static data that can be persisted on a filesystem. Also, I assume that you can hold quite a bit of data too. A file read should be faster than a database query. Also if you do the connect once and save the connection for several reads, that works too. The only real slow operation, outside of large resultsets, would be the initial connect.
I always design up two or three possible solutions and sometimes I protpotype each one. Sometimes one of the tests will prove to be the exact opposite choice of the one you thought would work.
Now that I have written your response, I think that you could create a custom class to hold data, but would that not just be a copy of the properties object. If it's key/value you need, that's the choice.
Stand back and ask, "What is the data type of the high level objects?"
Also, SUN has good articles on almost everything in the JDK.
David Whitehurst
[email protected]

Appllication scope JavaBeans synchronization

 Let's assume that there are two clustered Weblogic Servers.
 When modifying JSP JavaBeans's value which is JSP JavaBeans
 in application scope, is the other clustered JSP JavaBeans's value in application
 scope modified?
 And two clustered web site's JSP JavaBean's values are always synchronized?


To keep data synchronized and shareable between all cluster members, use our
 Coherence product in your Weblogic app.
 Peace,
 Cameron Purdy
 Tangosol, Inc.
 Clustering Weblogic? You're either using Coherence, or you should be!
 Download a Tangosol Coherence eval today at http://www.tangosol.com/
 "James McGovern" <[email protected]> wrote in message
 news:[email protected]..
 > Scope of Application is not shared in a cluster.
 >
 > "Shane" <[email protected]> wrote in message
 > news:3c7a5838$[email protected]..
 > >
 > > Let's assume that there are two clustered Weblogic Servers.
 > >
 > > When modifying JSP JavaBeans's value which is JSP JavaBeans
 > > in application scope, is the other clustered JSP JavaBeans's value in
 > application
 > > scope modified?
 > > And two clustered web site's JSP JavaBean's values are always
 > synchronized?

How to use application managed entity manager in EJB?

I finish reading The EntityManager Interface in JEE tutorial.
I know I can use container manager entity manager in EJB, but I want to explore how to use application managed entity manager in EJB.
Can I use application managed entity manager in EJB (container management JTA transaction is used)? Where do I should close entity manager if can?
The following is an example from JEE tutorial, but didn't find where to calose entity manager. and can I create mutiple EntityManagerFactory objects and Entity Manager objects to use them in a JTA transaction?
@PersistenceUnit
EntityManagerFactory emf;
EntityManager em;
@Resource
UserTransaction utx;
em = emf.createEntityManager();
try {
utx.begin();
em.persist(SomeEntity);
em.merge(AnotherEntity);
em.remove(ThirdEntity);
utx.commit();
} catch (Exception e) {
utx.rollback();

Seems like a very poor example, the whole power of EJBs is to use Container Managed Transactions so you don't NEED to manage the transaction and the entity manager yourself. What you posted is code I would expect in a non-JEE application, or in a piece of code which requires fine-tuned transaction boundaries such as batched data importing logic.
If I were you I'd research JPA in steps.
a) learn about JPA as an API outside of the scope of EJBs (recommended reading: the book 'Pro JPA 2')
b) learn about Container Managed Transactions in EJBs
c) learn about Bean Managed Transactions in EJBs
Right now you're rushing into c). I can understand that it raises many question marks at this point.

How do you use the "Item Containing Start/End Date" in a Calendar?

Hi
I want to do a calendar where the days shown will be conditional to a certain interval. Now I though I could achieve that using the Item Containing Start Date of a calendar. But it doesn't seem to work. In the help it says :
Enter an item in the application which holds the start date of the calendar. The format of the date in this item must be YYYYMMDD.
This is what I did here
http://apex.oracle.com/pls/otn/f?p=34530:1::::::
I have 3 fields. 2 for the Start Date and End Date and 1 for the "Date Item" parameter. Only the latter has an effect on the calendar display, the calendar only displays the month of the "Date Item" (in monthly mode).
Wether or not I check "Begin at Start of Interval", it doesn't affect the way those fields are affecting the Calendar.
So, how do we use that "Item Containing Start/End Date" parameter?

Hello,
does yout Script work when you begin with ?:
Start-Process powershell -Verb runAs
Best regards,
Stefan
German Orchestrator Portal ,
My blog in English

When to use which scope

Hi,
I have a CRUD application.. Where in the data is fetched, displayed n edited n stored back to db. Also there is a sequential access between pages & the information entered on the first page is needed on the second page & so forth. What would be the best scope & why ?
When to use which scope? What is the life-cycle of each scope.
Also, I couldn't find any good tutorial on scopes. If you are aware of the same, please guide.
Its urgent.
Thanks in advance.

921331 wrote:
Hi,
I have a CRUD application.. Where in the data is fetched, displayed n edited n stored back to db. Also there is a sequential access between pages & the information entered on the first page is needed on the second page & so forth. What would be the best scope & why ?
When to use which scope? What is the life-cycle of each scope.
Also, I couldn't find any good tutorial on scopes. If you are aware of the same, please guide.
Its urgent.
Thanks in advance.You could use ViewScope and parameters to the next view or if using CDI have a look at conversation scope. You should read about them in detail yourself because even if someone chooses one for you it's still you who has to go on to use it correctly.

Using ConnBean and CursorBean with a Data Source

Hi all,
I',m making a web app. using the Jdev (RUP4) with OA Extension. I looked in the help menu under "About Data-Access JavaBeans and Tags". Here I found the following example, but for some stange reason I cannot get the setProperty to work.
Example: Using ConnBean and CursorBean with a Data Source This following is a sample JSP page that uses ConnBean with a data source to open a connection, then uses CursorBean to execute a query.
<%@ page import="java.sql.*, oracle.jsp.dbutil.*" %>
<jsp:useBean id="cbean" class="oracle.jsp.dbutil.ConnBean" scope="session">
<jsp:setProperty name="cbean" property="dataSource"
value="<%=request.getParameter("datasource")%>"/>
</jsp:useBean>
<% try {
cbean.connect();
String sql="SELECT ename, sal FROM scott.emp ORDER BY ename";
CursorBean cb = cbean.getCursorBean (CursorBean.PREP_STMT, sql);
out.println(cb.getResultAsHTMLTable());
cb.close();
cbean.close();
} catch (SQLException e) {
out.println("" + "There was an error doing the query:");
out.println("<PRE>" + e + "</PRE>\n"); }
%>
Does anyone know how to set the "Property" to a datasource and make it work?
Best regards,
MHCI

There is no point-and-click (Import Data Source Metadata) way to use an LDAP server as a datasource. You have to use the Java Function provided on dev2dev. If you need help with it, please post here.
- Mike

Using Application Scope Javabean to hold data?

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