APEX integration with EBS 11i10: view concurrent request output

Hi All:
ENV: APEX 4.0
EBS: 11i10
DB: 10r2
APEX is installed in the same database as EBS 11i10
1. I have developed a APEX application that is can be launched from EBS as a form function. Also, the APEX will not ask any credential when user launch it from EBS, since user is already authenticated. Also, APEX will also display FND username, responsibility for user who has login - <<This is already implemented>>
2. by Default, APEX will display a page, where user can browser and import a csv file into a predefined custom table <<This is already implemented>>
3. After csv file is imported into cusotm table, user will click "Submit" button to process the data. APEX will submit a concurrent request (eventually, the concurrent program will call Oracle API to process data). A concurrent request is will display on the apex page. << This is WIP and I don't forsee any issue to implement this, since many have done this before>>
4. User will write down the request id from step 3 and go to another apex page. In this page, user will enter request id and click "View Output", which should retrieve the concurrent output for that request id and display the output in a new browser. I don't want user go back to EBS to view the concurrent output. << This is my question for this thread>>
My question for step 4: is there a seeded EBS API (FND_???) that I can call by passing a request id and API should display the concurrent request output in a browser automatically? Assuming, I will use fnd_global.apps_initialize() API in this page to set EBS env properly.
My question may not be a direct APEX question; however, I hope someone can offer some help to me. I have done numerous research on this and still haven't find this API.
Thanks!
Kevin

Hi Kevin,
I am having an issue implementing the Call from an EBS menu entry to the APEX Page.
I created the menu entry as a SSWA Function that use the apex_launch procedure to call the APEX page but when the user clicks on the option menu, the EBS login page appears.
Can you share with me how can I fix this?
Thanks
AEstrada.

Similar Messages

APEX integration with EBS R12.1.1 - no SSO

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Rod West document
http://www.oracle.com/technetwork/developer-tools/apex/apex-ebs-wp-cabot-consulting-169064.pdf
offers the jsp approach which I like to implement however the jsp will not compile correctly and I am not sure why - I have already fond one error with the code as listed in the document:
ojspCompile.pl compile -s 'LaunchApex.jsp ' retry ---> will not work
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PARALLEL COMPILATION: 1
[10389] !!COMPILATION ERROR(0) LaunchApex.jsp:
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^
has anyone tried this approach and got the jsp to compile with no errors or can you see what is it?
thanks in advance.

Hello Mini:
thanks for the info and I have followed the steps as listed. I am not sure what line is the bad code you listed is on - here is the copy of the jsp I am working with and maybe you can point to a specfic line(s) that need to be changed from what to what.
<%@ page contentType="text/html;charset=UTF-8" %><%--
/* LaunchApex.jsp */
--%><%@ page
import="java.io.*"
import="java.net.*"
import="java.sql.*"
import="javax.servlet.http.*"
import="java.util.Enumeration"
import="java.util.Properties"
import="java.lang.Math"
import="oracle.apps.fnd.common.VersionInfo"
import="oracle.apps.fnd.functionSecurity.Function"
import="oracle.apps.fnd.functionSecurity.RunFunction"
import="oracle.apps.fnd.common.WebAppsContext"
import="oracle.apps.fnd.common.AppsEnvironmentStore"
import="oracle.apps.fnd.common.WebRequestUtil"
import="oracle.apps.fnd.common.ResourceStore"
import="oracle.apps.fnd.security.CSS"
import="oracle.apps.fnd.common.Message"
import="oracle.jdbc.OracleConnection"
import="oracle.jdbc.OraclePreparedStatement"
import="oracle.jdbc.OracleResultSet" %><%!
// Session has to be validated first
WebAppsContext ctx = WebRequestUtil.validateContext(request, response);
if (ctx==null) {
return; }
String cookieName = ctx.getSessionCookieName();
boolean validSession = ctx.validateSession(cookieName);
WebRequestUtil.setClientEncoding(response, ctx);
%>
<html>
<head>
<title>Launch Apex</title>

</head>
<body>
<%
     String p_application = request.getParameter("application");
     p_application = ( p_application==null ? "NONE" : p_application);
     String p_page = request.getParameter("page");
     p_page = ( p_page==null ? "1" : p_page);
     String p_item_names = request.getParameter("item_names");
     p_item_names = ( p_item_names==null ? "" : p_item_names);
     String p_item_values = request.getParameter("item_values");
     p_item_values = ( p_item_values==null ? "" : p_item_values);
     AppsEnvironmentStore m_env = (AppsEnvironmentStore) ctx.getEnvStore();
     try {
          String l_launcher = ctx.getProfileStore().getProfile("APEX_HTTP_SERVER");
          l_launcher = l_launcher + "/pls/apex/f?p=" + p_application + ":" + p_page;
          l_launcher = l_launcher + "::APPS:::" + p_item_names + ":" + p_item_values;
     if (ctx!=null) ctx.freeWebAppsContext();
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     catch (Exception e) {
     out.println("Exception found : <pre>");
     e.printStackTrace(new PrintWriter(out));
     out.println("</pre>");
     } //catch
%>
</body>
</html>
*********

Apex Integration with EBS R12 - javax.servlet.ServletException

Morning,
We are in the process of upgrading from 11i to R12 and we have found that our method of launching Apex in 11i no longer works in R12. We are trying to follow the following instructions: http://www.oracle.com/technetwork/developer-tools/apex/apex-ebs-wp-cabot-consulting-169064.pdf and have created a .jsp file and compiled as per the document. When we try to launch the function from apps though we get:
An exception occured.
URL=XXX/OA_HTML/XXFND_LaunchApex.jsp?transactionid=1236782452&language_code=US&CallFromForm='Y'&p_application=112&p_page=101&oas=DScF2XdCwRRnxFePUKHOnQ..
javax.servlet.ServletException: oracle.classloader.util.AnnotatedClassNotFoundException:
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         Code-Source: XXX/apps/tech_st/10.1.3/j2ee/home/lib/ojsp.jar
       Configuration: in META-INF/boot.xml in XXX/apps/tech_st/10.1.3/j2ee/home/oc4j.jar
This load was initiated at oacore.web.html.jsp1603821464:0.0.0 using the loadClass() method.
The missing class is not available from any code-source or loader in the system.I've XXX'ed out our domain. Has anyone else has this, or can anyone who has successfully integrated apex with EBS R12 let me know what they did?
Thanks

Hi,
If the jsp compiled successfully then you may need to bounce your web server before the jsp can be used. See MOS Note 458338.1 for more details.
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Rod West

Help needed in Apex Integration with EBS

Hi All,
Currently, when trying to integrate with EBS these are the steps I followed.
1) Created apex generate hash and apex launch procedure in APPS DB.
2) Created Profile in Application Developer Responsibility.
3) Saved above profile in system administrator -->Profile -> System and set the site level as http://<hostname>:<Apex port>/pls/apex
4) Created a function in system administrator , type as SSWA plsql function and called the launch procedure and passed parameters as my apex application and page id.
5) Created a Web PL/SQL entry under System Administrator Responsibility -> Security -> Web PL/SQL for the launch procedure.
6) Created menu, responsibility and assigned to the user.
For the APEX application , currently I have not given any login page. The login is through EBS only. I have given logout URL in apex application to EBS Login page. Now my problem is , when I click Logout the session of EBS does not get invalidated. How can I achieve this ?
Secondly, When I give the APEX application URL directly in the browser it will open without asking for the EBS login credential. But I do not want this to happen. I need it to be authenticated through EBS login credential.
Any suggestions would be welcome.
Thanks
Alaka

Hi Scott,
I tried the solution given in this URL.
http://oracledbas.blogspot.com/2008/11/oracle-application-express.html
It is not working for me.. I tried in the forum also.
While creating authentication scheme I gave Oracle EBS Login Page as Session Not Valid URL. But every time I login to EBS and click responsibility then menu which has APEX screen, it is not validating username and password and it redirects to EBS login page which i gave in "session not valid URL" (it is going to a loop.)
Now my problem is when I login to EBS and click responsibility then my APEX screen should validate the EBS login and directly it should open. It should not ask for any other (APEX login)login page. If I paste the APEX application URL in any browser it should ask for EBS login page.
When I logout it should invalidate the session of EBS.
Thanks
Alaka

Need to view concurrent request output(pdf file of XML report)from OAFpage

Hi,
I am submitting a concurrent request from OA page (on click of submit button).
As of now, to view output of the request user has to open SRS form.
Now the rquirement is to submit the request as well as to open the output file of the request in one action(i.e. on click of submitbutton) instead of going to SRS form to view output.
From the forum, I found out the way to go to request monitoring page and view all the current requests. But this is something different from what I am looking for.
Can somebody help m in this case?
Thanks & Regards
Nitin

refer this link
http://apps2fusion.com/at/ps/286-bi-publisher-document-viewer-common-region-embeded-report-output-in-oa-framework-page
--prasanna

Apex integration with EBS

Here are the setups that I did in EBS.
Created function TEST with Type : SSWA plsql function that opens a new window (Kiosk Mode)
Parameters : application=105&page=1&request=null&item_names=null&item_values=null
WEB HTML Call : apex_launch
Assigned this function to Menu and then assigned Menu to responsibility.
My Apex and EBS are on seperate servers.
When I click Menu from responsibility it opens up EBS login Page.
Here are my settings in Oracle database.
CREATE OR REPLACE PROCEDURE apex_launch (application IN NUMBER
, page IN NUMBER DEFAULT 1
, request IN VARCHAR2 DEFAULT NULL
, item_names IN VARCHAR2 DEFAULT NULL
, item_values IN VARCHAR2 DEFAULT NULL)
AS
BEGIN
OWA_UTIL.mime_header('text/html', FALSE);
OWA_COOKIE.send(name => 'APEX_APPS_105',
value=>FND_GLOBAL.user_name||':'||apps.apex_generate_hash(FND_GLOBAL.user_name),
expires => sysdate + 365,
domain=>'.silganplastics.com'
OWA_UTIL.redirect_url(
'http://cfdsun113.silganplastics.com:8090'||'/apex/f?p='||
application||':'||page||'::'||request||':::'||
item_names||':'||item_values);
--:FSP_AFTER_LOGIN_URL := 'http://cfdsun113:8090/pls/apex/f?p=105:1:' || :APP_SESSION;
END apex_launch;
create or replace FUNCTION apex_authorise (
p_username IN VARCHAR2
, p_password IN VARCHAR2) RETURN BOOLEAN
AS
BEGIN
IF apex_validate_hash (p_username, p_password) THEN RETURN TRUE; END IF;
RETURN (FND_WEB_SEC.validate_login (p_username, p_password) = 'Y');
END apex_authorise;
create or replace FUNCTION apex_validate_hash (
p_string IN VARCHAR2
, p_hash IN VARCHAR2
, p_delay IN NUMBER DEFAULT 5) RETURN BOOLEAN
IS
BEGIN
FOR i IN 0..p_delay LOOP
IF p_hash = apex_generate_hash (p_string, i) THEN RETURN TRUE; END IF;
END LOOP;
RETURN FALSE;
END apex_validate_hash;
CREATE OR REPLACE FUNCTION APPS.apex_generate_hash (
p_string IN VARCHAR2
, p_offset IN NUMBER DEFAULT 0) RETURN VARCHAR2
IS
G_KEY RAW(32) := UTL_I18N.STRING_TO_RAW( 'abfhhhhhhhhhuiooooo', 'AL32UTF8' );
BEGIN
IF p_string IS NULL THEN RETURN NULL; END IF;
RETURN RAWTOHEX(UTL_RAW.cast_to_raw(
DBMS_OBFUSCATION_TOOLKIT.MD5(input_string=>p_string||':'||
TO_CHAR(SYSDATE-(p_offset/24*60*60),'YYYYMMDD HH24MISS')||g_key)));
END apex_generate_hash;
Settings on APEX side
On Load Before Header process on login page.
DECLARE
c owa_cookie.cookie;
a wwv_flow_global.vc_arr2;
BEGIN
c := owa_cookie.GET('APEX_APPS_105');
a := htmldb_util.string_to_table(c.vals(1));
:p101_username := a(1);
:p101_password := a(2);
IF :p101_password IS NOT NULL THEN
wwv_flow_custom_auth_std.login(p_uname => :p101_username,
p_password => :p101_password,
p_session_id => v('APP_SESSION'),
p_flow_page => :app_id || ':1');
END IF;
EXCEPTION
WHEN others THEN
NULL;
END;
Created Authentication scheme with
function
FUNCTION apex_authorise (
p_username IN VARCHAR2
, p_password IN VARCHAR2) RETURN BOOLEAN
AS
BEGIN
RETURN (FND_WEB_SEC.validate_login
(p_username, p_password) = 'Y');
END apex_authorise;
END IF;
END;
Logout URL
wwv_flow_custom_auth_std.logout?p_this_flow=&APP_ID.&p_next_flow_page_sess=&APP_ID.:105:&SESSION.:LOGOUT
and sessionnotvalid page as LoginPage.
After all these settings when I login from EBS I get login page for applications and nothing happens. I don't think it's making any calls to apex_launch procedure.
Anyone if implemented this please guide step by step. Want to know where I am going wrong. Is then any logging to be turned on EBS side to know where the program fails.
Thanks in advance,
Suman

Hi Rod,
I am able to redirect the to the apex page. Now the concern is that it is asking for the user name and password. If I type my EBS user name and password it works.
But the main concept is that it should not ask for user name and password. Those values should be passed through cookies. Can you please help me with the same
Here is the code what i have place. Am I going wrong in some setup?
/* Formatted on 3/8/2010 10:41:05 AM (QP5 v5.126.903.23003) */
CREATE OR REPLACE PROCEDURE apex_launch (
application IN NUMBER Default 101,
page IN NUMBER DEFAULT 1,
request IN VARCHAR2 DEFAULT NULL,
item_names IN VARCHAR2 DEFAULT NULL,
item_values IN VARCHAR2 DEFAULT NULL
AS
l_value varchar2(100);
l_valid_session varchar2(100);
BEGIN
D OWA_UTIL.mime_header ('text/html', FALSE);
OWA_COOKIE.send (
name => 'APEX_APPS_'||application,
VALUE => icx_sec.g_user_id--FND_GLOBAL.user_name
|| ':'
|| apex_generate_hash (FND_GLOBAL.user_name),
PATH => '/'
l_value:=FND_PROFILE.VALUE ('STR_APEX_LOGIN')
|| '/f?p='
|| application
|| ':'
|| page
|| '::'
|| request
|| ':::'
|| item_names
|| ':'
|| item_values;
OWA_UTIL.redirect_url(l_value);
END apex_launch;
Error when i tested that procedure
ORA-06502: PL/SQL: numeric or value error
ORA-06512: at "SYS.OWA_UTIL", line 325
ORA-06512: at "SYS.HTP", line 852
ORA-06512: at "SYS.OWA_UTIL", line 396
ORA-06512: at "APPS.APEX_LAUNCH", line 43
ORA-06512: at line 15
This is what i m passing in my header in apex.
DECLARE
c OWA_COOKIE.cookie;
a wwv_flow_global.vc_arr2;
P101_USERNAME varchar2(100);
P101_PASSWORD varchar2(100);
APP_ID number;
BEGIN
c := OWA_COOKIE.get ('APEX_APPS_' || APP_ID);
a := HTMLDB_UTIL.string_to_table (c.vals (1));
P101_USERNAME := a (1);
P101_PASSWORD := a (2);
IF P101_PASSWORD IS NOT NULL
THEN
wwv_flow_custom_auth_std.login (P_UNAME => P101_USERNAME,
P_PASSWORD => P101_PASSWORD,
P_SESSION_ID => v ('APP_SESSION'),
P_FLOW_PAGE => APP_ID || ':1');
END IF;
EXCEPTION
WHEN OTHERS
THEN
NULL;
END;
my site is getting there but i have to pass the user name and password.
Can you please help me is some setup missing. as I found this link on
This is in the link
ERROR at line 1:
ORA-06502: PL/SQL: numeric or value error
ORA-06512: at "SYS.OWA_UTIL", line 325
ORA-06512: at "SYS.HTP", line 1322
ORA-06512: at "SYS.HTP", line 1397
ORA-06512: at "SYS.HTP", line 1689
ORA-06512: at "FLOWS_020000.WWV_FLOW_API", line 3243
ORA-06502: PL/SQL: numeric or value error: character string buffer too small
ORA-06512: at "FLOWS_020000.WWV_BIU_STEP_ITEMS", line 63
ORA-04088: error during execution of trigger 'FLOWS_020000.WWV_BIU_STEP_ITEMS'
ORA-06512: at line 7
and your database is running with NLS_LENGTH_SEMANTICS=CHAR, then you need to change it to NLS_LENGTH_SEMANTICS = BYTE. The following technique can be used for this change:
1. alter system set nls_length_semantics = BYTE scope = spfile;
2. shutdown the database
3. restart the database
Will be glad if you can help in solving it.
Thanks,
Nitin Singh

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How to view concurrent request of other users

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Would really appreciate if some one can guide me how i can allow the super user "A" to be able to view all the concurrent requests that were submitted by various key users of HRMS.
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how to do this???

594647 wrote:
We have upgraded recently to R 12.
Would really appreciate if some one can guide me how i can allow the super user "A" to be able to view all the concurrent requests that were submitted by various key users of HRMS.
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R12 View Concurrent Requests FAQ [ID 1261985.1]
Unable To View Concurent Output Executed By A User Of The Same Responsibility [ID 1468231.1]
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To view the concurrent request output in a custom form

Hi,
I have a requirement to view the concurrent request output from a custom form.
I can use the function "fnd_webfile.get_url " in a PL/SQL procedure and get the value for URL for the request output.
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and also how to display the URL which has been obtained.
regards

Hi,
I used the below code in my form
l_url := fnd_webfile.get_url
file_type =>'request_xml_output' , --fnd_webfile.request_out,
id => req_id,
gwyuid => l_gwyuid,
two_task => l_two_task,
expire_time => 10 -- minutes, security!.
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Now no compilation error exists however how do I display the concurrent request in the screen.
I am not clear here, is there any function I need to use. I checked the FNDRSRUN form and there they have used
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regards
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OBIEE Installation doc's and integration with EBS 12.0.6.

HI,
I had installed OAS 10g with OSS and OID and integration with EBS R12.0.6.
Now I want to install OBIEE(On Linux) and wants to iuntegrate with SSO.
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Hi,
Check this might be helpful... http://gerardnico.com/wiki/dat/obiee/linux_installation
http://onlineappsdba.com/index.php/2007/10/29/biee-installation-on-linux-business-intelligence-enterprise-edition/
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http://obibb.wordpress.com/2010/07/30/integrating-oracle-ebs-and-oracle-bi-ee-part-i/
Thanks,
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Do we have OBIEE integrated with EBS

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Do we have OBIEE integrated with EBS or we have to do it manullly..do we have any docs.
Please suggest..
S

Hi,
Never i have done this but i can show you the path.
[http://it.toolbox.com/blogs/eye-on-obi/oracle-bi-applications-obiee-security-integration-with-oracle-ebusiness-suite-17246]
OBIEE Integration with EBS 11.5.10 or R12 Apps
By,
Kranthi.

Concurrent request output files removed - now concurrent requests failing

Hi.
I recently removed all *.out files from the concurrent request out directory that were older than 5 days.
I didnt think these were needed, only recorded output from earlier concurrent requests. But now we have a request complaining that
The Applications File Server could not open the file /apps/prod/prodcomn/admin/out/PROD/o16499119.out for read.
Any ideas?
Thanks.
Oracle 10.2.0.4
EBS 11.5.0.2
DA

Dan,
It is expected to get this error as the concurrent request output file is missing. The only way to fix this error is to restore the out files from a recent backup you have taken. Or, ask the user to submit the same concurrent program again and a new out file will be created then.
Thanks,
Hussein

APEX Integration with EBusiness 12.1.3

I am trying to connect to an APEX app thru EBS and skip the logon page. I have followed Rod West's document http://www.oracle.com/technetwork/developer-tools/apex/apex-ebs-wp-cabot-consulting-169064.pdf ] ). I've also been searching thru postings reading any info provided by others who have had trouble getting this working but have not seen the error I'm getting.
FYI - using Apex 3.2 (I know it's old!) EBS R12 12.1.3; APEX is on another domain and in another schema.
I am getting very close because if I hardcode the username in the Onload process, it works great - creates new password, skips 2nd logon page, etc. Where I'm having the problem is with wfa_sec.getsession. I've tried wrapping it in another package and anything else I can think of and always get the error below:
ORA-20002: 3403: Internal: error while getting session information. -6502: ORA-06502: PL/SQL: numeric or value error: character string buffer too small ORA-06512: at "SYS.HTP", line 1515 ORA-06512: at "SYS.HTP", line 1735 ORA-06512: at "APPS.ORACLEAPPS", line 1111 ORA-06502: PL/SQL: numeric or value error ORA-06512: at "APPS.ICX_SEC", line 2387 ORA-06502: PL/SQL: numeric or value error ORA-06512: at "SYS.OWA_UTIL", line 356 ORA-06512: at "SYS.HTP", line 1368 ORA-06512: at "SYS.HTP", line 1443 ORA-06512
So then I created a simple procedure to run thru EBS as a concurrent program to just call the same package
create or replace package sko_session_pkg as
procedure getsession
(errbuf out varchar2, retcode out varchar2);
end sko_session_pkg;
create or replace package body sko_session_pkg AS
PROCEDURE getsession (errbuf out varchar2, retcode out varchar2) IS
p_user varchar2(320) := NULL;
begin
wfa_sec.getsession(p_user);
end getsession;
end sko_session_pkg;
When I run this procedure I get the same error:
**Starts**12-JUL-2012 19:10:22
ORACLE error 20002 in FDPSTP
Cause: FDPSTP failed due to ORA-20002: 3403: Internal: error while getting session information. -6502: ORA-06502: PL/SQL: numeric or value error: character string buffer too small
ORA-06512: at "SYS.HTP", line 1515
ORA-06512
Output file size:
0
Has anyone encountered this error when accessing wfa_sec.getsession?
Any help would be greatly appreciated and thanks in advance!
Sandie

Rod,
I thought I should attempt to get your LaunchApex.jsp provided in Figure 9 from your document working before I added additional code to call the get_apex_url.
LaunchApex.jsp compiled successfully and the apps server was bounced but getting Page Not Found error. Without the get_apex_url code in LaunchApex.jsp, I was expecting it to just bring up the APEX login screen (like the GWY.jsp does). FYI - I'm calling this from EBS responsibility/menu pointing to Function 'APEX_LOGIN'; type=SSWA jsp function; HTML Call=LaunchApex.jsp?&application=614&page=3140
The url that shows when I get the page not found is
http://....../OA_HTML/RF.jsp?function_id=51525&resp_id=64694&resp_appl_id=0&security_group_id=0&lang_code=US&params=JGFTjw4wmhX6TenmVQJ4IGGtVKZXnnU1EV.XsJrX5us&oas=xn4Xk7Bp9SgoTpjrieP_Zw..
Where is the RF.jsp coming from???? There's a call in the jsp to validate the session so thought maybe it wasn't able to do that and is just returning.
If I type url
http://..../OA_HTML/LaunchApex.jsp? I get same 'Page Not Found'.
Thx for all of your help!
Sandie

Error after viewing Concurrent Request logfile--tools-Copy file

Hi ALL,
Navigation Path
==============
After concurrent request gets complete--View Log-tools -copy Logfile-
I am getting error "The Applications File Server could not open the file for read".
Can you please put some light on this error.
Your help is highly appreciated.
Cheers,
Sridhar

Hi,
What is the application release?
Has this ever worked? If yes, any changes have been done recently?
Can you reproduce the issue with all reported?
Please make sure that the application listener is up. Also, run AutoConfig and make sure it completes successfully.
Regards,
Hussein

Discoverer integration with EBS R12 !!!

Hello Sir,
I need help to install/integrate Discoverer with R12.
Actually, our clients are using Discoverer 4i in current EBS 11.5.10.2 in production. We have just upgraded EBS in TEST environment from 11.5.10.2 to R12.1.3.
I had suggested client that Discoverer 4i is actually de-supported and they need to upgrade Discoverer version to minimum 10.1.2.3 or higher to integrate it with R12.1.3.
Now, client also have requirement for Discoverer to be certified with MS Excel 2010 format. So I have suggested to upgrade Discoverer version to minimum 11.1.1.4.
Latest certified Discoverer version is 11.1.1.7.0 as per note Using Discoverer 11.1.1 with Oracle E-Business Suite Release 12 (Doc ID 1074326.1)
1) Can you please provide your opinion and any documentation which I can follow to install/integrate Discoverer with R12 ?
2) Do I need to first install separate 10gAS for installing Discoverer 10.1.2.3 or Fusion middleware home for installing Discoverer 11g ? If yes, where can I find doc for this installation ?
3) Since 10g support has ended July 2013, where can I get media for installing 10gAS ?
4) Is there any additional licences required for using either Discoverer 10g or Discoverer 11g ?

1) Can you please provide your opinion and any documentation which I can follow to install/integrate Discoverer with R12 ?
In addition to the doc you have, please see:
https://blogs.oracle.com/stevenChan/entry/discoverer_11_1_1_7
How to Test Discoverer Integration with E-Business Suite 11i and Release 12? (Doc ID 1065257.1)
Running Discoverer Reports From EBS R12 (Doc ID 1516784.1)
R12: How to Create a Link to a Discoverer Workbook (Doc ID 471303.1)
2) Do I need to first install separate 10gAS for installing Discoverer 10.1.2.3 or Fusion middleware home for installing Discoverer 11g ? If yes, where can I find doc for this installation ?
Installation Recommendations - 11g Release 1 (11.1.1)
Installer Screens - 11g Release 1 (11.1.1.7.0)
3) Since 10g support has ended July 2013, where can I get media for installing 10gAS ?
You can download WebLogic 10.3.6 from WebLogic Server 12c (12.1.1), WebLogic Server 11g (10.3.6) and Previous Releases
4) Is there any additional licences required for using either Discoverer 10g or Discoverer 11g ?
Please see Steven Chan's reply in this link -- https://blogs.oracle.com/stevenChan/entry/discoverer_11gr1_primer
Thanks,
Hussein

APEX integration with EBS 11i10: view concurrent request output

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