Session variables in bean

How can i reach a xhtml variable - for example #{var[' ']} - from a Bean?
Thank You!

so what you are saying is: the best way is to instead
defining these instance variables, pass these
variables values as parameters to private methods?I would agree with this. You need to be very careful when using instance variables with SSB's. You only (currently) have one public method defined in your bean, so you don't need to be concerned about the Container serving you up a different bean on a latter invocation - yet. Adding another public method that uses the same instance variables will cause this to break.
As far as synchronization goes, you can get into scalability problems here. If your container is trying to process multiple threads through your Bean, each thread will be forced to block until the previous thread continues its task - which can be a performance killer. A slow database query for one user could starve many other users on the system.
I would suggest either passing all your variables as parameters to your private methods, or (if you are talking about a lot of parameters being passed,) create a Delegate Object behind your EJB to handle all of the processing.

Similar Messages

How to get and set a session variable from backing bean?

Hi im using Jdev 11.1.1.2.0 and i need to set and get a session variable from backing Bean.
Any idea?

the class :
package arq.resources;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpSession;
public class SesionSigef {
public FacesContext context;
public HttpSession session;
public SesionSigef() {
super();
context = FacesContext.getCurrentInstance();
session = (HttpSession)(context.getExternalContext().getSession(true));
public Object getVariableSesion(String atributo){
return session.getAttribute(atributo);
public void setVariableSesion(String atributo,Object valor){
session.setAttribute(atributo, valor);
the example of use :
SesionSigef se = new SesionSigef();
DatosRec da = new DatosRec();
da.setDocumentoCip("Aprobar");
se.setVariableSesion("DatosRec", da);
thanks
Joaquin

How to default bind variable using session variable at run time

Hi All,
I have a requirement where all VO queries (multiple VOs) produce only records that meet a certain value.
For example, I have three tables with 3 VOs and each of them has a one-to-many relationship to another table (let's call it ref table and this table has a field called release). One of the 3 VOs is a parent/master table, and the other two are child tables. I created a VO for master table that linked to the ref table and created a view criteria using the release (use bind variable) field from the ref table. The other child tables have their own VO that has view criteria that also linked to ref table using the release field.
On the UI page, I created a query component and a table from the master table VO. I also dropped the child table VOs in a tabbed panel which partial triggered by the master table. When I ran a query for a 'release' (hint: ref table value), the table for master table was filled the correct records that meet the criteria. Unfortunately, the child tables were not correct due to the query didn't use the bind variable that filter only records for the same 'release' value as the master table.
The question is how do I 'default' or dynamically set the bind variable on the child tables based on the selection criteria from the query component. I am thinking to set a session variable from the query and use it in the bind variable in the child table, but not sure how to do it.
Any suggestion how to do it or better solution to achieve the same effect?

Hi,
How about creating a custom AMImpl method, that takes parameters as required, and set the bind variables for all the desired VOs and perform executeQuery on them.
You could expose this as client interface, and then use the method as parameter form.
Check this thread for ex.
Re: Setting Attribute in View Object through Managed Bean
-Arun

Help Needed in checking session variable

In a sample site, I am calling a bounded task flow from an unbounded task flow. In the called taskflow the default activity is a router which checks the session variable, and the home page will be loaded only if the session variable is not null. If session variable is null router will lead to a page dispalying 'session expired'. But even after clearing the session if I copy pasted the previous url, the home page is loading. But when I call bounded taskflow from a bounded taskflow, it is working fine. Can anyone suggest any solution? Thanks in advance

Thanks for the reply. I'm using jdev 11.1.1.5.0.. I'm just trying with a sample example. I have a login page and when the user logins, the user name is stored in session. the loginpage view activity is in adfc config unbounded taskflow. The login credentials is validated in a backing bean and based on the return value, if the login is valid, a bounded taskflow 'hometaskflow' is called. In this bounded taskflow, the default activity is a router wchich checks the username stored in session. If the username is not null it will lead to the 'homepage' view. Else if it is null it will lead to a 'sessionexpired' view.
In the java class of login page I'm accessing the session variable as shown
public Username getSessionBean()
Username username =
(Username)resolveExpression("#{Username}");
return username;
public static Object resolveExpression(String expression)
FacesContext facesContext = FacesContext.getCurrentInstance();
Application app = facesContext.getApplication();
ExpressionFactory elFactory = app.getExpressionFactory();
ELContext elContext = facesContext.getELContext();
ValueExpression valueExp =
elFactory.createValueExpression(elContext, expression,
Object.class);
return valueExp.getValue(elContext);
On login button click the function being executed is as shown
public String onLoginClick() {
if(String.valueOf(itUserName.getValue()).equals("admin")
&& String.valueOf(itPassword.getValue()).equals("admin"))
Username username=getSessionBean();
username.setUsername(itUserName.getValue().toString());
return "success";
else {
return "invalid";
And to set username as null on logout, I used this function on logout click
public void clearSession()
Username username=getSessionBean();
username.setUsername(null);
The EL expression used to check the value of session variable is
#{sessionScope.Username.username==null} outcome is expired
#{sessionScope.Username.username!=null} outcome is active
This worked when I used in a bounded taskflow, which is being called from another bounded taskflow. But not working in this scenario...

How to get the session variable value in JSF

Hi
This is Subbus, I'm new for JSF framewrok, i was set the session scope for my LoginBean in faces-config.xml file..
<managed-bean-name>login</managed-bean-name>
<managed-bean-class>LoginBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope> like that...
So all parameter in LoginBean are set in session right ?... for example i used userId is the Parameter...
Now i need to get the the userId parameter from that session in my another JSP page.. how i get that ?..
Already i tried
session.getAtrribute("userId");
session.getValue("userId");
but it retrieve only "null" value.. could u please help me.. it's very urgent one..
By
Subbus

Where i use that..is it in jsp or backend bean...
simply i use the following code in one backend bean and try to get the value from there bean in the front of jsp page...
in LogoutBean inside
public String getUserID()
 Object sessionAttribute = null;
 FacesContext facescontext=FacesContext.getCurrentInstance();
 ExternalContext externalcontext=facescontext.getExternalContext();
 Map sessionMap=externalcontext.getSessionMap();
 if(sessionMap != null)
 sessionAttribute = sessionMap.get("userId");
 System.out.println("Session value is...."+(String)sessionAttribute);
 return (String)sessionAttribute;
 return "fail";
JSP Page
<jsp:useBean id="logs" scope="session" class="logs.LogoutBean" />
System.out.println("SS value is ...."+logs.getUserID());
but again it retrieve only null value.. could u please tell me first how to set the session variable in JSF.. i did faces-config only.. is it correct or not..
By
Subbus

How to use session variable in JSP function & How to use both JSP Servlet

Hi,
I am new to JSP and servlets
Still I am devloping a website in JSP. I am not mixing JSP with servlets, but I do create Java files for bean, logic and database works.
I try to keep the hard coding part out of JSP.
I dont how to use both JSP and Servlets in combination.
Hence If needed I write some functions in JSP.
but it gives me error
+<%! public void abc()+
+{+
int intUserId = Integer.valueOf((Integer) session.getAttribute("MySession_UserID"));
+}+
+%>+
Saying cannot find symbol session
1) So can u please tell how can I access session variables within JSP function
2) And also give me some links/tutorials about useing both JSP and Servlets in combination.
Thanks
Venkat

The application architecture when you use Servlets and JSP in a standard MVC pattern is explained here (under the heading "Integrating Servlets and JSP Pages") and here ...

How to pass a session variable to the bussines layer?

Hello,
I am doing a management application, and I need to store the login user that make insertions on any table, and the pages does not has backing beans.
I had try to do that bindding the value field of a hidden attribute with the session variable, but it only change the value of the one. My second attempt was make an javascript function to do that on the page´s load, but it not looks like a good solution.
Someone knows a way to sent the session value to the bussines layer? O a way to access from the Bussines layer to the session?
Thanks
Tony


Hi,


Another solution (that I always use) is storing simultaneously the same data in HttpSession (in view layer) and session hashtable (in businness layer).


You can put and get these data in any businness component using following methods:



private void setToJboSession(String key, Object val){
 Hashtable userData = getDBTransaction().getSession().getUserData();
if (userData == null) {
userData = new Hashtable();
userData.put(key, val);
}


and



private Object getFromJboSession(String key){
return getDBTransaction().getSession().getUserData().get(key);
}


Kuba

Use of session variable to retrieve user language

Hi,
I'm converting some ASP code to JSP and I'm having a problem concerning session variables, in ASP I had something like this
(first.asp)
<td align="center" width=145px><%=getLabel(1)%>
and in second.asp
dim Label(3,2)
function GetLabel(ndx)
GetLabel = Label(ndx, Session("Language"))
end function
clang_PT = 1 ' Portuguese
clang_EN = 2 ' English
Label(0,clang_PT) = "primeira"
Label(1,clang_PT) = "Segunda"
Label(0,clang_PT) = "first"
Label(1,clang_PT) = "second"
when trying to do the same thing in JSP
(first.jsp)
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@include file="labels.jsp"%>
<!DOCTYPE HTML PUBLIC "-//w3c//dtd html 4.0 transitional//en">
<%if (session.isNew()) {
session.setAttribute("Language","1");
}%>
<%= getLabel(1)%>
(labels.jsp)
<%@ page language="java" import="java.util.*"%>
<%@page pageEncoding="UTF-8"%>
<%! String getlabel(int ndx){
return label[ndx][session.getAttribute("Language")];
String[][] label = new String[2][2];
%>
<%
int clang_PT = 0; // Portugu�s
int clang_EN = 1; // Ingl�s
label[0][clang_PT] = "primeira";
label[1][clang_PT] = "segunda";
label[0][clang_EN] = "first";
label[1][clang_EN] = "second";
%>
I get
cannot find symbol symbol : variable session location: class org.apache.jsp.experiencia_jsp return label[ndx][session.getAttribute("Language")];
^
and
cannot find symbol : method getLabel(int)
location: class org.apache.jsp.experiencia_jsp
out.print( getLabel(1));
Should I use a bean to store this kind of info?
thanks, V

right...
actually, cuz doing this:
<%!
String getlabel(int ndx){
int lang = Integer.parseInt((String)session.getAttribute("Language"));
return label[ndx][lang];
%>
there's no session object... that creates a method in the class separate from the main JSP method. So you need to either pass the session object in, or just pass the attribute value..
<%!
String getlabel(int ndx, int lang){
return label[ndx][lang];
%>
int lang = Integer.parseInt((String)session.getAttribute("Language"));
String lable = getLabel(ndx, lang);

How to access a session variable just before rendering a JSF page???

Dear Sirs...
i am using jdeveloper 10.1.3.2 with JSF and ADF faces. i want to access a session variable and perform some processing just before rendering a page. how can i achieve this????
i am a little new to jsf, so i feel a little lost
thanks for any help in advance, and best regards


Hi,


See example 60 "Triggering OnPageLoad-Style Code in a JSF Backing Bean Using ADF PagePhaseListener or PageController" on Steve's Muench blog.


Kuba

Session Variable in any Object

Hi, I've been developing on java, jsp and struts for a while now, and I've got something that I can't resolve:
I have some session variables in struts, such as User, role, etc... I can get the session using request.getSession() and then get them without any trouble. My design uses the MVC pattern, so I also have a Model Object. I also have a database controller class to store my model. The problem is that I wanna retrieve the session variables from the database controller, and there I don't have the request object. I could use a set, or take the parameters I need, put them on a bean and pass that bean as a parameter; but that would be very ugly, and I would have to change almost every class of my application.
Is there a way to have session variables from any object?
Thanks!!!
Leandro

nope... you have to pass the reference in like anything else.

Accessing session variables....urgent

Hi,
i have a session variable in my JSF application that stores the userId when a user logs in!!
i need to access the session variable in a method in the bean.
can HttpSession and HttpServletRequest objects be accessed in the managed bean
help me with the code please.....itzz urgent

see http://forum.java.sun.com/thread.jspa?forumID=427&threadID=545939

Losing my session variables in an iFrame

Hello. When I call into an iFrame I lose all my session variables. Any idea why this is? In a managed bean I set it as follows:
HttpSession hs = (HttpSession) FacesContext.getCurrentInstance().getExternalContext().getSession(false);
hs.setAttribute("userName", userName);
I then try to retrieve from a managed bean as follows:
FacesContext fc = FacesContext.getCurrentInstance();
HttpSession session = (HttpSession) fc.getExternalContext().getSession(false);
session.getAttribute("userName")
But it always comes out as null.
Thanks.

Bump. Any ideas? =/ I'm still not successful in pulling back any session variables. I can pass it on the command line, but that's certainly not desirable.
Thanks.

To pass new session variable value to stored proc before running a report.

Hi,
Below is summary of the report requirement -
Database level design
1. Created a view and a global temporary table (GTT)
2. Created an Oracle package procedure to accept from and to business dates on basis of which it will fetch, process and populate the GTT.
Repository level design
1. Created a business model containing the view and the GTT (mentioned above)
2. Created two SESSION variables "from_dt" and "to_dt" to be initialized by their respective init blocks. Each of the variable is initialized with a DATE column value (of type DATETIME) from a database lookup table. I have also set the option "Enable that variable to be set by any user" for both variables.
Query for these variables :
from_dt = select from_date from <table>
to_dt = select add_months(from_date,12) from <table>
Presentation level design
1. Using a text box, i display the default/initialized values of these variables like this -
Current business date:@{biServer.variables['NQ_SESSION.from_dt']} Future business dt:@{biServer.variables['NQ_SESSION.to_dt']}
Dates get displayed in YYYY-MM-DD 00:00:00 format
The text msg displays these default dates and allows the user to specift different date range for which i create prompts as shown below.
2. Using any random two columns of date type from the business model, i create two date dashboard prompts with labels "From Dt" and "To Dt".
i select Calender Controls for both; setting Default To = Report Defaults.
The Set Variable is set to Presentation variables - such that pv_from_dt maps to "From Dt" and pv_to_dt maps to "To Dt".
3. i create the report using the business model created above. In the report "Advanced Tab" => "Prefix" field i specify the following -
SET VARIABLE from_dt='@{pv_from_dt}',to_dt='@{pv_to_dt}';
Note : The logic here is to display the default dates and allow user to specify different date values which will be stored in presentation variables.
If the user does specify different "from dt" and "to dt" values, then using the presentation variables, i want to "write" back these new values to the corresponding session variables mentioned above.
If the user does not specify different date range, then the default/initialized dates must be considered.
I also display the default and new date values in the report title.
Back to Repository level design
To execute the stored procedure that will load the GTT before running the report I need to pass two date parameters to the stored procedure on basis of which it will fetch data, process and populate the GTT.
In the Connection Pool --> Connection Script Tab --> Execute before query, I wrote the below query using the repository variables FROM_DT and TO_DT to execute the procedure -
DECLARE
v_from_dt date;
v_to_dt date;
BEGIN
v_from_dt := VALUEOF(From_Dt);
v_to_dt := VALUEOF(To_Dt);
package_name1.package_body(v_from_dt,v_to_dt);
END;
Now when i try to run the report i get the following error :
[nQSError: 10058] A general error has occurred. [nQSError: 23006] The session variable, NQ_SESSION.to_dt, has no value definition. (HY000)..
Need help on this.
Is it possible to "write back" a new value to a session variable ?
Any other alternatives.
Thanks
Nusrat
Edited by: user10309945 on Jan 24, 2011 10:08 PM

Sandeep, I found a several topics where users describe saving values in DB through stored procedure or function. For example, [How to store OBIEE presentation level variable values in DB |http://forums.oracle.com/forums/thread.jspa?threadID=892006] I tried it and get an error
*10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 17001] Oracle Error code: 14551, message: ORA-14551: cannot perform a DML operation inside a query ORA-06512*
It's not a BI error. This error are generated by Oracle DB. If I write next:
SELECT MyPLSQLFunction(p1,p2) FROM DUAL
I get the same error.
Oracle doesn't allow DML operations in SELECT.
Did you relalize this feature yourself? Where did I mistake?

Session variable size limitation (LV Webservices)

Hi community,
I read couple dozen email addresses from an XML and trying to write them into a session variable. The email addresses are comma separated and have a total string length of about 1100 characters. When I try to write it into a session variable LabVIEW drops an error message (-67158).
It is very clearly related to the size of the string as if use lets say only 200 characters I dont receive the error message.
How can I get rid of this limitation?
Thanks!

I am writing a general purpose webpage where I need email notifications. I have the workaround ready (before I send out the emails I dont read the emails from a session, but using the userID stored in the session to read the email from the xml). But generally having this limitation is annoying and unnecessary as normally you easily can store 100kB in one session. (probably even more, but that was the max I have ever did)

Trying to move a list of form variables to session variables of the same name

I am trying to move a list of form variables to session variables of the same name and I am having a lot of trouble.
I have never had to post of this forum with a language question in all the 10 years I have been using ColdFusion. I was a qa Engineer @ Allaire/Macromedia back when it was going from one to the other. I have a pretty good grasp of the language.
I have software that runs off a list. The fieldnames are variable and stored off in an array. It's survey software that runs off a "meta file". In this example; I have the number of fields in the survey set to 12 in the "metafile". I have each field declared in that file in array Session.SurveyField[1] and the above loop works fine. I include this "metafile" at the start of the process.
I cfloop around a struct and it works wherever I have needed to use it; such as here - writing to the database for example;
<CFQUERY NAME="InsertRec" DATASOURCE="Survey">
INSERT into #variables.SurveyTableName#
(EntryTime
<cfloop from="1" to="#Session.NumberOfSurveyFields#" index="arrayindex">
,#Session.SurveyField[arrayindex]#
</cfloop>

 VALUES
 ('#EntryTime#'
<cfloop from="1" to="#Session.NumberOfSurveyFields#" index="arrayindex">
<cfset thisname = "Session." & Session.SurveyField[arrayindex]>
,'#evaluate(variables.thisname)#'
</cfloop>

</CFQUERY>
NOW HERE'S THE PROBLEM: I am running into trouble when trying to move the form variables to session variables of the same name. It is the only part of the software that I still need the datanames hard coded and that is a roadblock for me.
<cfloop from="1" to="#Session.NumberOfSurveyFields#" index="arrayindex">
<cfset thissessionfield = "Session." & Session.SurveyField[arrayindex]>
<cfset thisformfield = "Form." & Session.SurveyField[arrayindex]>
<cfset #thissessionfield# = #evaluate(thisformfield)#>
</cfloop>
I have tried it with or without the "evaluate"; same result. It doesn't give an error; it just ignores them (session variables look as such in the next page in the chain)
q01_name=
q02_acadtechorna=
q03_water=
q04_firstaid=
q05_cpr=
q06_lifeguard=
q07_aed=
q08_projadv=
q09_color=
q10_santaclaus=
q11_supervisor=
q12_supervisoropinion=
Note: they exist because I CFPARAM them in a loop like the above at the start of the procedure) - and this works just fine!
<cflock scope="Session" type="EXCLUSIVE" timeout="30">
<cfloop from="1" to="#Session.NumberOfSurveyFields#" index="arrayindex">
<cfset dataname = "Session." & Session.SurveyField[arrayindex]>
<cfparam name="#variables.dataname#" default="">
</cfloop>
</cflock>
I EVEN tried exploiting the Form.Fieldnames list using CFLoop over the list and the same sort of logic within and it still gives me nothing....
Here's the FORM.FIELDNAMES value
"Q01_NAME,Q02_ACADTECHORNA,Q03_WATER,Q04_FIRSTAID,Q05_CPR,Q06_LIFEGUARD,Q07_AED,Q08_PROJAD V,Q09_COLOR,
Q10_SANTACLAUS,Q11_SUPERVISOR,Q12_SUPERVISOROPINION"
Here's the logic; SAME RESULT - The session variables don't get set.
<cfoutput>
<cfloop list="#Form.FieldNames#" index="thisfield">

<cfscript>
thisSESSIONfield = "Session." & thisfield;
thisFORMfield = "Form." & thisfield;
#thisSESSIONfield# = #thisFORMfield#;
</cfscript>
</cfloop>
</cfoutput>
The CFPARAM in a loop with variable output name works just fine; so does the post (which I included above) as does the SQL Create, Param Form Variables, Param Session Variables, etc.
THIS even works for moving BLANK to each session variable, to zero them all out at the end of the process;
<cflock scope="Session" type="EXCLUSIVE" timeout="30">
<cfloop from="1" to="#Session.NumberOfSurveyFields#" index="arrayindex">
<cfset thislocalfield = Session.SurveyField[arrayindex]>
<cfscript>
thissessionfield = "Session." & thislocalfield;
</cfscript>
<cfset #thissessionfield# = "">
</cfloop>
</cflock>
Expanding on that code, you would think this would work, but it doesn't;
<cfloop from="1" to="#Session.NumberOfSurveyFields#" index="arrayindex">
<cfset thislocalfield = Session.SurveyField[arrayindex]>
<cfscript>
thissessionfield = "Session." & thislocalfield;
thisformfield = "Form." & thislocalfield;
</cfscript>


<cfoutput>
<cfset #thissessionfield# = "#evaluate(thisformfield)#">
</cfoutput>
</cfloop>
And see that debug code in the middle? To add insult to injury... When I uncomment that it shows me this. So it certainly looks like this should work....
Session.q01_name = "Me"
Session.q02_AcadTechORNA = "N/A"
Session.q03_Water = "Yes (certificate expired)"
Session.q04_FirstAid = "Yes (certificate is current)"
Session.q05_CPR = "No"
Session.q06_LifeGuard = "Yes (certificate expired)"
Session.q07_AED = "Yes (certificate expired)"
Session.q08_ProjAdv = "Yes (certificate expired)"
Session.q09_Color = "Gray"
Session.q10_SantaClaus = "Yes"
Session.q11_Supervisor = "Da Boss"
Session.q12_SupervisorOpinion = "Not a bad thing"
There must be some simpler way to do this. This way won't work against all odds even though it seems so much like it should.
So I end up having to hardcode it; still looking for an automated way to set these #@%$*@!## session variables over the list from the form variables of the same @#@!$#%$%# name. Do I sound frustrated???
No matter what I do, if I don't HARDCODE like this;
<cfset Session.q01_name = Form.q01_name>
<cfset Session.q02_AcadTechORNA = Form.q02_AcadTechORNA>
<cfset Session.q03_Water = Form.q03_Water>
<cfset Session.q04_FirstAid = Form.q04_FirstAid>
<cfset Session.q05_CPR = Form.q05_CPR>
<cfset Session.q06_LifeGuard = Form.q06_LifeGuard>
<cfset Session.q07_AED = Form.q07_AED>
<cfset Session.q08_ProjAdv = Form.q08_ProjAdv>
<cfset Session.q09_Color = Form.q09_Color>
<cfset Session.q10_SantaClaus = Form.q10_SantaClaus>
<cfset Session.q11_Supervisor = Form.q11_Supervisor>
<cfset Session.q12_SupervisorOpinion = Form.q12_SupervisorOpinion>
I always get this from my next page because the session variables are empty;
You must answer question 1.
You must answer question 2.
You must answer question 3.
You must answer question 4.
You must answer question 5.
You must answer question 6.
You must answer question 7.
You must answer question 8.
You must answer question 9.
You must answer question 10.
I tried duplicate as well, but I can not get the above to work...
Can anyone help me do this thing that one would think is simple????

I think if you use structure array syntax you should get the results you want.
<cfloop from="1" to="#Session.NumberOfSurveyFields#" index="arrayindex">
 <cfset session[Session.SurveyField[arrayindex]] = Form[Session.SurveyField[arrayindex]]>
</cfloop>
Or probably even easier.
<cfset session = duplicate(form)>

Session variables in bean

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