What is the use of session in jsp

hai,
what is the use of session in jsp. i cant understand from books. give some practical approach
thanks

give some practical approachYou sound like a supervisor ordering for a cup of coffee.
I DONT TAKE ORDERS !!
IMAO
Which book did you refer ? Did you google ?

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What is the use of jsp when compare with Struts

what is the use of jsp when compare with Struts

JSP Tag Libraries are great for reusable content formatting and ligic.
For example, let's say you have this Shopping site. Each item you sell is stored in a database, and you get them out depending on Catagories, creating a List of ItemBeans. You allways want to display the items with a catagory header, then a <table> with the item number, the description and the price.
Instead of creating a bunch of logic in the JSP that does this, you can pass it on to a Tag that might look like this in your JSP:
<shopping:itemTable catagory="${selectedCatagory}" items="${itemsForCatagory}" />
This would make the JSP easier to read and work with.
The actual uses are incredible. Have you used the <jsp:useBean ...> tag? That is an example of a use of the Custom Tag Libraries.
Furthermore, look into JSTL (JSP Standard Tag Libraries). They are a collection of tags (API by Sun, coding by Apache) used to do many of the standard actions you might want/need to do in JSPs, like a conditional tag (c:if only do something if the test is true), multiple-conditional tags (c:choos c:when c:otherwise) like an if [else if] else construct. Looping through an array or Collection (c:forEach), storeing values in scopes (c:set) formating numbers and dates (the fmt library), xml transformations (xml library), and lots of other things that you could replace scriptlet code with.

What is the use of %@ taglib uri="taglib" prefix="hbj" % in jsp?

what is the use of
<%@ taglib uri="taglib" prefix="hbj" %>
in jsp?
The portal Content works fine even without that.
Any specific reasons?

Hello Hanif,
This is the we declare taglibs in JSP files. Check this for definition:
http://java.sun.com/products/jsp/tutorial/TagLibraries5.html#61992
After declaring this taglib <%@ taglib uri="taglib" prefix="hbj" %>
, you can use all HTMLB classes as tags in JSP.
I am not sure in which JSP you mean that every thing works fine with out this taglib!! But if you remove this taglib, then you cannot use HTMLB in this JSP.
http://help.sap.com/saphelp_nw2004s/helpdata/en/42/efdb279a563ee7e10000000a1553f7/frameset.htm
Greetings,
Praveen Gudapati
p.s Points are always welcome for helpful answers

What's the available value for weblogic.jsp.encoding in web application.

Hi,
          I'm using chinese windows nt 4.0 and weblogic 5.1 sp6.When I did not set
          weblogic.jsp.encoding to GB2312 , when the jsp file contain's chinese , the
          output will be error .And when I did not set it , the output is correct, but
          when I use request.getParameter("SomeFormElement")(the element inputed
          chinese), the return value is error.
          How should I set weblogic.jsp.encoding value to satisfy all this problem?
          When I set the value to ISO-8859, there is an exception:
          java.io.UnsupportedEncodingException: Charset: 'ISO-8859' not recognized,
          and there is no alias for it in the weblogic.httpd.charsets property. So
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          Pan


hi ,
i think the best way is to create java beans ,in that bean call your EJB ,
and check the validation over there.
and make that bean scope to session.
in each and everypage try to check the session ,if it is not valid then forward to your login page...
otherwise continue to give access to him like guest
Regards,
AfTaB

What is the use of Tcode: SM35

Hi Experts,
What is the use of Tcode: SM35
If some one can brief me in detail it would be great help.
Appreciate your early response.
Regards
Rajesh

Hi Rajesh,
SM35 is used to run Batch input sessions.
These sessions can be created via LSMW or any batch-input ABAP program.
To run a session, select the session and press "Process".
You can either process foreground (as if you are entering the data), display errors only (runs in background as far as there is no error), background (you need to check the errors when the session is over).
Regards,
Dilek
Edited by: Dilek Ersoz Adak on Dec 16, 2009 4:19 PM

What is the Use of "Alter database activate standby database"

Hi ,
I appreciate your time.
I just wanted to know what is the use of "Alter database activate standby database" command when doing the failover. How different it will act in failover process. Can we use this command in SwitchOver.
Thanks in advance.

Hi Uwe Hesse,
Wonderfull... good info....
So my understanding is that the use of "ACTIVATE PHYSICAL STANDBY DATABASE" is conditional and depends on the redo log gap and the Database status(Able to mount or not).
Condition 1: If the Db is in Mount state and Redo log gap is successfully filled.
1) Flush any unsent redo from the primary database to the target standby database.
SQL> ALTER SYSTEM FLUSH REDO TO target_db_name;
Note: If the above Statement Completes successfully without any errors.
2) Stop Redo Apply.
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
3) Finish applying all received redo data.
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE FINISH;
4) Verify that the target standby database is ready to become a primary database.
SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;
5) Switch the physical standby database to the primary role.
SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY WITH SESSION SHUTDOWN;
Condition 2: If the DB is not able Mount and Redo Gap can't be filled.
Important Note: If the the above command in STEP3 gives error, some received redo data was not applied. Try to resolve the cause of the error and re-issue the statement before proceeding.
If the error condition cannot be resolved, a failover can still be performed (with some data loss) by issuing the following SQL statement on the target standby database:
SQL> ALTER DATABASE ACTIVATE PHYSICAL STANDBY DATABASE;
Thanks in advance.

What is the use of these filters in atg

Hi Guys,
In my web.xml file i have code like this
<filter>
 <filter-name>PageFilter</filter-name>
 <filter-class>atg.filter.dspjsp.PageFilter</filter-class>
 </filter>
 <filter>
 <filter-name>ForwardFilter</filter-name>
 <filter-class>atg.servlet.ForwardFilter</filter-class>
 </filter>
 <filter>
 <filter-name>ErrorFilter</filter-name>
 <filter-class>atg.servlet.ErrorFilter</filter-class>
 </filter>
 <filter-mapping>
 <filter-name>ErrorFilter</filter-name>
 <url-pattern>/*</url-pattern>
 <dispatcher>ERROR</dispatcher>
 </filter-mapping>
 <filter-mapping>
 <filter-name>ForwardFilter</filter-name>
 <url-pattern>/*</url-pattern>
 <dispatcher>FORWARD</dispatcher>
 <dispatcher>ERROR</dispatcher>
 </filter-mapping>
 <filter-mapping>
 <filter-name>PageFilter</filter-name>
 <url-pattern>/*</url-pattern>
 <dispatcher>REQUEST</dispatcher>
 <dispatcher>ERROR</dispatcher>
 <dispatcher>FORWARD</dispatcher>
 </filter-mapping>
what is the use of these filters what will happend if i remove these filters in web.xml file
please give me clear picture on these 3 filters and how these filters are helpful in our application.

As the name filter suggest, All the request will go though these filters if certian condition is satisfied
In ATG web.xml contains following filter:
<filter>
 <filter-name>PageFilter</filter-name>
 <filter-class>atg.filter.dspjsp.PageFilter</filter-class>
</filter>
<filter-mapping>
 <filter-name>PageFilter</filter-name>
 <url-pattern>*.jsp</url-pattern>
</filter-mapping>
When there is .jsp in url pattern all the request will go through Page Filter.
Filter is java concept.For More details about Filter, Refer http://docs.oracle.com/cd/E19502-01/819-3669/6n5sg7b0b/index.html
In order to process Jsp request, ATG use Page filter. It converts normal HttpRequest/HttpResponse to DynamoHttpRequest/DynamoHttpResponse. Please refer http://docs.oracle.com/cd/E24152_01/Platform.10-1/ATGPlatformProgGuide/html/s0801requesthandlingwithservletpipeli01.html

What is the use of 'keep' parameter in BDC

Hi
In BDC while transfering data, what is the use of 'keep' parameter in BDC.

Hi Jyothsna,
In the function module BDC_OPEN_GROUP, the EXPORTING parameter KEEP acts as a deletion indicator for session in which the batch data executed.
CALL FUNCTION 'BDC_OPEN_GROUP'
EXPORTING
CLIENT = SY-MANDT
DEST = FILLER8
GROUP = FILLER12
HOLDDATE = FILLER8
 KEEP = FILLER1
---
KEEP retains the session after successful processing if its value is set to 'X'. A session that is kept remains in the input/output queue until an administrator deletes it in SM35 transaction.
Sessions that contain errors in transactions are kept even if KEEP is not set.
Default: If not set, then sessions that are successfully processed are deleted. Only the batch input log is kept in SM35 transaction.
Hope this sort out your query.
PS If the answer solves your query, plz close the thread by rewarding points to each reply.
Regards

What is the use of t-rfc in ALE? compared to t-rfc, Qrfc is better and effi

what is the use of t-rfc in ALE? compared to t-rfc, Qrfc is better and efficient?

Hi Sunil,
These are the types of RFC
Asynchronous RFC (aRFC)
Synchronous RFC (sRFC)
Transactional RFC (tRFC)
Queued RFC (qRFC)
Parallel RFC (pRFC)
Asynchronous RFC :
This is used when you need to increase the performance of ABAP program by having system call more than one function module in parallel than forcing the program to wait for results .
Transactional RFC
This let you group one or more function module call together o tRFC LUW and ensure that fucnction module within LUW is called once . In contrast to aRFC and sRFC the tRFC belonging to tRFC LUW are executed in order .
tRFC is always used if a function is executed as a Logical Unit of Work (LUW). Within a LUW, all calls are
1.Executed in the order in which they are called
2.Executed in the same program context in the target system
3.Run as a single transaction: they are either committed or rolled back as a unit.
Implementation of tRFC is recommended if you want to guarantee that the transactional order of the calls is preserved
Asynchronous remote function calls (aRFCs) are similar to transactional RFCs, in that the user does not have to wait for their completion before continuing the calling dialog. There are three characteristics, however, that distinguish asynchronous RFCs from transactional RFCs:
When the caller starts an asynchronous RFC, the called server must be available to accept the request.
The parameters of asynchronous RFCs are not logged to the database, but sent directly to the server.
Asynchronous RFCs allow the user to carry on an interactive dialog with the remote system.
The calling program can receive results from the asynchronous RFC.
You can use asynchronous remote function calls whenever you need to establish communication with a remote system, but do not want to wait for the functions result before continuing processing. Asynchronous RFCs can also be sent to the same system. In this case, the system opens a new session (or window). You can then switch back and for between the calling dialog and the called session
RECEIVE RESULTS FROM FUNCTION Remotefunction is used within a FORM routine to receive the results of an asynchronous remote function call. The following receiving parameters are available:
IMPORTING
TABLES
EXCEPTIONS
The addition KEEPING TASK prevents an asynchronous connection from being closed after receiving the results of the processing. The relevant remote context (roll area) is kept for re-use until the caller terminates the connection.
Hope this resolves your query.
Reward all the helpful answers.
Regards

What is the use of security-constraint tag in web.xml

what is the use of following tag , and how to use that, and where to use that tag.
<web-resource-collection>
<web-resource-name>SecureOrderJSP</web-resource-name>
<descrip<url-pattern>/order/*</url-pattern>
<http-method>GET</http-method>
<http-method>POST</http-method>
</web-resource-collection>
<auth-constraint>
<role-name></role-name>
</auth-constraint>
</security-constraint>tion>Protect the Order JSP Pages </description>

Hi,
You can refer this link
http://www.whizlabs.com/tutorial/scwcd/j-scwcd-7-5.html
give the complete description of your doubt
Thanks,
Snigdha Sivadas

What is the use of Single Sign On?

What is the use of Single Sign On? How is it different from simple session handling.
I am new to Portal Technology. I am not gettting the concept of Single Sign On.
Please can anyone brief about it.
Thanks

SSO will store all your sessions to every applications and also it can remember your login/passwords for each application and then pass them transparently.
In Application Server Portal is considered like a partner application and SSO is used when you connect to Portal.

What is the use of sqlplus /nolog?

What is the use of sqlplus /nolog?

In case of /nolog option --> Starts SQL*Plus but does not log on (connect) a user/session. A connection can then be made in SQL*Plus with connect. (i.e., no initial connection)

What is the use of variant in the alv report

hello all,
what is the use of variant in the alv report

Hi,
For Variants
follow the link:
http://help.sap.com/search/highlightContent.jsp
Variants allow you to save sets of input values for programs that you often start with the same selections. You can use them for any programs except subroutine pools (type S).
Contents
Variants: Overview
Initial Screen
Displaying a Variant Overview
Creating and Maintaining Variants
Creating Variants
Attributes of Variants
Changing Variants
Deleting Variants
Printing Variants
Variable Values in Variants
Creating Variables for Date Calculations
User-specific Selection Variables
Creating User-specific Variables
Changing Values Interactively
Changing Values from the Program
Fixed Values from Table TVARV
Creating Table Variables from TVARV
Changing TVARV entries
Running a Program with a Variant
Variants: Overview
Use
Whenever you start a program in which selection screens are defined, the system displays a set of input fields for database-specific and program-specific selections. To select a certain set of data, you enter an appropriate range of values.
For further information about selection screens, see Working with selection screens in the ABAP User's Guide.
If you often run the same program with the same set of selections (for example, to create a monthly statistical report), you can save the values in a selection set called a variant.
You can create any number of variants for any program in which selection screens are defined. Variants are assigned exclusively to the program for which they were created.
You can also use variants to change the appearance of the selection screen by hiding selection criteria. This is particularly useful when you are working with large selection screens on which not all of the fields are relevant.
Reports, module pools, and function groups may have several selection screens. It is therefore possible to create a variant for more than one selection screen.
Variants are an interface between the user and the selection screen. They can be used both in dialog and in background mode, although their uses are slightly different.
Variants in Dialog Mode
In dialog mode, variants make things easier for the user, since they save him or her from continually having to enter identical values. They can also make the selection screen easier to read, because you can use them to hide input fields. Running an executable program with a variant containing an optimal set of values also reduces the capacity for user error. The optimized database selections speed up the runtime of the program.
Variants in Background Mode
Variants are the only method for passing values to a report program in a background job. Therefore, when you run a program in the background, you must use a variant (or SUBMIT... VIA JOB). To avoid you having to create a new variant each time you run the report, ABAP contains a mechanism allowing you to pass variable values to variants. See variable values in variants.
To ensure that an executable program is always started using a variant, you can specify in the program attributes that the program may only be started in this way.
Features
Creation of variants
Display, change, copy, print, and delete variants
Use and definition of variables in variants
Variable date calculation
User-specific fixed values
Fixed values in table TVARV
You access the variant maintenance tool from the initial screen of the ABAP Editor. Enter the name of the program, select Variants in the Sub-objects group box, and then choose Display or Change.
Functions
The above screen allows you to:
Create variants
Display the variant directory
Display and change values and attributes
Copy, delete, and rename variants
Before creating a new variant for a program, you should check whether you can use or adapt an existing variant instead.
There are two ways to display variants:
Position the cursor on the Variant field on the initial screen and press F4. The following dialog box lists all of the available variants:
Choose Variants ® Directory on the initial screen:
Creating Variants
Prerequisites
You must have defined one or more selection screens for the relevant program. The program may have any type except type S.
Procedure
On the initial screen of the ABAP Editor, enter the name of the program for which you want to create a variant, select Variants in the Sub-objects group box, and choose Change.
On the variant maintenance initial screen, enter the name of the variant you want to create.
Note the naming convention for variants (see below).
Choose Create.
If the program has more than one selection screen, a dialog box appears in which you can assign the variant to one or more screens. The dialog box does not appear if the program only has one selection screen. In this case, the selection screen of the program appears straight away.
If there is more than one selection screen, select the screens for which you want to create the variant.
Example:
If you choose Variant for all selection screens, the variant also applies to any selection screens that you create after creating the variant.
Otherwise, the variant only supplies values to the selection screens that you select in the list.
Choose Continue.
The (first) selection screen of the program appears.
If your program has more than one selection screen, use the scroll buttons in the left-hand corner of the application toolbar to navigate between them. If you keep scrolling forwards, the Continue button appears on the last selection screen.
Enter the required selections, including multiple and dynamic selections.
Choose Continue.
Result
When you have finished, an overview screen appears (ABAP: Save Attributes of Variant), on which you can enter the attributes of your variant and save it.
Note that when you create a new variant, you must enter both values and attributes.
Names of variants: Names can consist of up to 14 alphanumeric characters. The "% " character is not allowed. If you want the variant to be transported automatically with its program, you must create a system variant. The name of a system variant starts "CUS&" for customers, and "SAP&" for SAP system variants. You can only use the "&" character within this prefix in the name of a system variant. It may not occur in any other context. System variants are administered by the Workbench Organizer. Although you can create and access variants from any client, they are always stored in client "000".
Creating Variants
Prerequisites
You must have defined one or more selection screens for the relevant program. The program may have any type except type S.
Procedure
On the initial screen of the ABAP Editor, enter the name of the program for which you want to create a variant, select Variants in the Sub-objects group box, and choose Change.
On the variant maintenance initial screen, enter the name of the variant you want to create.
Note the naming convention for variants (see below).
Choose Create.
If the program has more than one selection screen, a dialog box appears in which you can assign the variant to one or more screens. The dialog box does not appear if the program only has one selection screen. In this case, the selection screen of the program appears straight away.
If there is more than one selection screen, select the screens for which you want to create the variant.
Example:
If you choose Variant for all selection screens, the variant also applies to any selection screens that you create after creating the variant.
Otherwise, the variant only supplies values to the selection screens that you select in the list.
Choose Continue.
The (first) selection screen of the program appears.
If your program has more than one selection screen, use the scroll buttons in the left-hand corner of the application toolbar to navigate between them. If you keep scrolling forwards, the Continue button appears on the last selection screen.
Enter the required selections, including multiple and dynamic selections.
Choose Continue.
Result
When you have finished, an overview screen appears (ABAP: Save Attributes of Variant), on which you can enter the attributes of your variant and save it.
Note that when you create a new variant, you must enter both values and attributes.
Names of variants: Names can consist of up to 14 alphanumeric characters. The "% " character is not allowed. If you want the variant to be transported automatically with its program, you must create a system variant. The name of a system variant starts "CUS&" for customers, and "SAP&" for SAP system variants. You can only use the "&" character within this prefix in the name of a system variant. It may not occur in any other context. System variants are administered by the Workbench Organizer. Although you can create and access variants from any client, they are always stored in client "000".
reward all help full answers

What is the use of bean?

I'm new to JSP.What is the use of bean? And how do we write it? Can I do the JSP which connect to database without using the bean?

You don't need JavaBeans when working with JSPs. For info on JavaBeans look here: http://developer.java.sun.com/developer/onlineTraining/Beans/beans02/
As a general rule of thumb it's not a very good idea to have JSPs connect directly to a database. I'd higly recommend you pickup "Java Servlet Programming" from O'Reilly, it covers Servlets, JSPs and how to tie them together.

What is the use of Internet Toolkit?

What is the use of Internet Toolkit?And the IDT is free?Thank your respond.

Check out this link on NI's site for the product sheet for the toolkit.
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What is the use of session in jsp

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