"Dive into BC4J" by Steve Muench

Hi Steve,
We use View objects mapped to entity objects. I created the default view object, set the bind var style to ? and created static strings for the various where clauses.
The where clauses then get set during runtime.
In your white paper you stated that if the where clause has to be set during runtime the way to go is with the ? style bind var.
Later you state that if we use the Oracle jdbc driver then the :1 oracle style is the way to go.
My questions:
1. What i understand out of this is that i must change the bind var style to :1 etc, since we use the oracle jdbc driver??
2. What exactly happens when the where-clause gets set to the same static string with only the bind variables changing? Does the re-parse/QueryPlan get triggered on the setWhereClause()??
Or does the DB recognise the query as one that's been performed before and skips the formalities??
Thanks in advance.

1. What i understand out of this is that i must change the bind var style to :1 etc, since we use the oracle jdbc driver??
you'll get better performance with Oracle-style bind variables.
2. What exactly happens when the where-clause gets set to the same static string with only the bind variables changing?
you wouldn't reset the where clause here, only reset the bind variables.
In terms of API's, I mean that you'd call setWhereClauseParams() but not call setWhereClause() if the string of the where clause is not changing.
Does the re-parse/QueryPlan get triggered on the setWhereClause()??
resetting the where clause will cause BC4J to throw out the JDBC prepared statement and re-create it with the new statement.
There are two things going on here.
a. reuse of jdbc prepared statements
b. reuse of SGA parsed sql statements
If anything in the text of the sql changes (even one extra space!), then the DB SGA will need to reparse the query, doing checks on access rights and query plan etc.
It's best not to change the SQL statement, and only reset the bind variable values.
Or does the DB recognise the query as one that's been performed before and skips the formalities??
It tries to.
Bottom line, don't bother to reset the where clause if it's not really changing.

Similar Messages

Dive into BC4J related --REF CURSOR

I read through the article (Dive into BC4J )and generated several questions:
1)If I have to execute a ref cursor:
private static final String SQL =
"begin ? := RefCursor.getSomthing(?, ?);end;";
Now I need to pass two parameters to the stored procedure,
assume first is ID varchar2, second Name varchar2
In my client code: I use vo.executeQuery()
then how can I pass these two parameters? (so that the executeQueryForCollection(Object qc,Object[] params,int numUserParams) can use them)
NOTES: The viewobject I created is not based on any sql statement, but an expert mode, i.e., I created the attributes myself.
2)createRowFromResultSet(...) function calls
populateAttributeForRow(r,0, nullOrNewNumber(rs.getBigDecimal(1)));
If there are more than one rows in the reseultset, will
this function be called "automatically" by the frame work to iterate through each every row in the resultset?
Thanks.
Scott

In short, yes. :-)

URGENT - Dive into BC4J related -- REF CURSOR

Hi,
I am trying out the example as provided by Steve in his article. This is what I've as of now:
1. Created a VO based on EMP.
2. Added custom code to ViewImpl.java file.
3. Created a browse JSP (BC4J based).
Now I want to be able to pass the passmeter for dept no from JSP. So, I used
<jbo: SetWhereClauseParam index="0" value="10" datasource="ds">
First of all, I get nothing in JSP when I use index=0. If I change index from 0 to 1, then I get all the records (from various depts.) which means that the parameter is not been used.
Can someone please help me.
Thanks,
Jatinder

I've tried exactly this and it works.
Try what you find in this zip file:
http://www.geocities.com/smuench/RefCursorVO.zip

Error while running a sample XSQL from XML bible book from Steve Muench

I am running the sample XSQL code from Chapter 03, which deals with exporting XML and transform into SQL statements. I'm using JDeveloper and I believe I've setup libraries and HTML root directory etc. I'm getting the following error:
XSQL-011 Error processing XSLT stylesheet.
XSL-1009 Attribute xsl:version not found in xsl:stylesheet.
Can I get some help in fixing this error?
Thanks a lot,
Murali
null

Hi,
This is the example I took from Steve Muench's book.
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:template match="/">
</xsl:template1>
</xsl:stylesheet>
As you can see, I do have the version=1.0 attribute. Why is it complaining still?

Servlet problem: (Shay Shmeltzer / Steve Muench / Frank Nimphius)

Dear sirs... (Shay Shmeltzer / Steve Muench / Frank Nimphius)
I hope you can give me an answer.
I created an ADF UIX application using JDeveloper 10.1.2. I have created a servlet to download files. my problem is that it works just fine using jdeveloper, while when deployed into oracle application server it causes errors.i am calling this servlet by storing filename and data in the session, then sending redirect request to the browser.
the servlet code is:
package view;
import java.io.OutputStream;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.PrintWriter;
import java.io.IOException;
public class FileDownload extends HttpServlet
public void init(ServletConfig config) throws ServletException
super.init(config);
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
try
String DownloadFileName=(String) request.getSession().getAttribute("downloadfilename");
byte data[]=(byte []) request.getSession().getAttribute("downloadfiledata");
if (DownloadFileName==null)
return;
request.getSession().removeAttribute("downloadfilename");
request.getSession().removeAttribute("downloadfiledata");
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment;filename="+DownloadFileName);
response.setContentLength(data.length);
OutputStream OS=response.getOutputStream();
OS.write(data);
catch (Exception e)
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
try
String DownloadFileName=(String) request.getSession().getAttribute("downloadfilename");
byte data[]=(byte []) request.getSession().getAttribute("downloadfiledata");
if (DownloadFileName==null)
return;
request.getSession().removeAttribute("downloadfilename");
request.getSession().removeAttribute("downloadfiledata");
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment;filename="+DownloadFileName);
response.setContentLength(data.length);
OutputStream OS=response.getOutputStream();
OS.write(data);
catch (Exception e)
and the error is :
java.lang.IllegalStateException: Response has already been committed
at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.EvermindHttpServletResponse.resetBuffer(EvermindHttpServletResponse.java:1902)
at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.ServletRequestDispatcher.forward(ServletRequestDispatcher.java:213)
this error is stored in the log file. if i am running this code from JDeveloper I can download the files using either FireFox or Internet Explorer without any error.
but if i am running this code using Oracle Application Server 10g Realse 2, i can not download the files using either FireFox or IE.
so i created another solution, instead of redirecting from a datapage into the servlet, i put the following code in a data page as follows:
public void onDownload(DataActionContext ctx)
String DownloadFileName=getfilename();
byte data[]=getdata();
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment;filename="+DownloadFileName);
response.setContentLength(data.length);
OutputStream OS=response.getOutputStream();
OS.write(data);
OS.flash();
this time the application works fine when deployed into Oracle Application Server if you use FireFox, but if you use IE, it causes problem, i can not save the file or view it.
what is the problem?
how can i fix this?
i am certin that the second method is not correct and it should not be used.
thanks for everyone in advance
best regards

Dear Sir...
Thanks alot for your replay
regarding the reset method. Itried it and it does not give any good.
I discovered the following problem:
If you are redirecting from with struts dataaction page to the servlet, you get the error
Otherwise if you called the servlet from directly or redirected to a servlet from within a servlet, you get no problem.
can any one help me please??
Is it possible that the problem is in IE itself? The file is downloaded perfectly fine with firefox(but the error log still appear)?
best regards

Displaying Images in ADF/JSF: Error Using Steve Muench's Example #69

Hi,
I've been able to load images into the database using Steve Muench's Example 69. However, I'm having issues displaying the images.
Jdeveloper: 10.1.3.3.0
Database: 10gR2 with ORDSYS active.
I'm getting the following error:
07/08/20 12:09:20.993 JSFOrdImageExample-ViewController-webapp: Servlet error
java.lang.NullPointerException
     at oracle.ord.html.OrdPlayMediaServlet.renderContent(OrdPlayMediaServlet.java:403)
     at oracle.ord.html.OrdPlayMediaServlet.deliver(OrdPlayMediaServlet.java:263)
     at oracle.ord.html.OrdPlayMediaServlet.doGet(OrdPlayMediaServlet.java:204)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:65)
     at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:162)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:623)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:370)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:871)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:453)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:221)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.HttpRequestHandler.run(HttpRequestHandler.java:122)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.HttpRequestHandler.run(HttpRequestHandler.java:111)
     at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
     at java.lang.Thread.run(Thread.java:613)I'm not sure why I'm getting a NullPointerException...
Previous to this, I had to include the bc4jhtml.jar file as a library in application.xml, and I've tried using the two bc4jhtml.jar files, but neither one seems to work.
I'm thinking that there must be something simple that I'm missing with the servlet setup...
Thanks!
Kenton

I tried the wayback machine, but unfortunately, it doesn't cache the SWF files either :( I do have a copy of some (ok one) of Steve's old videos (the one that shows how to do a dropdown list in an editable table, back before it was easy to do), but unfortunately, none of the search ones.
John

Dynamic JDBC credentials example application from Steve Muench

Apologies for this newbie question...but I'm trying to understand the Dynamic JDBC credentials example application from Steve Muench:
http://radio.weblogs.com/0118231/stories/2004/09/23/notYetDocumentedAdfSampleApplications.html#14
I think I understand most of it but the one bit I dont understand is why it customizes the ADF Page Lifecycle (DynamicJDBCADFPhaseListener, DynamicJDBCPageLifecycle, DynamicJDBCPageLifecycleContext).
Can anyone explain to an ex-forms developer why this code is there?
I'm also trying to work out a way for the session to be invalidated when the user logins again
e.g. a user logins, he doesnt use the logout function but uses the back button to go back to the login page. when he logs in with another set of credentials, would a new session start or as i supsect, it would use the original login credentials?
Thanks

You can ignore those three classes in the example. They are not related to the dynamic credential solution, and must have been left over from some other example I evolved into what you see. Sorry to have cluttered up the implementation with stuff that isn't really contributing to the actual solution. DOH!

Error while running the tutorial posted by Steve Muench

Hi Guys,
I have been trying to run the tutorial published by Steve Muench on October 9 2006. I've followed all the steps as specified in the tutorial.
Chapter 3.4:Run the Application, should supposed to compile and run my application using stand-alone embedded OC4J. It was compiled witout any error. But gave me the following error while running the application.
[Starting OC4J using the following ports: HTTP=8988, RMI=23891, JMS=9227.]
C:\oracledevday\jdeveloper\jdev\system\oracle.j2ee.10.1.3.39.14\embedded-oc4j\config>
C:\oracledevday\jdeveloper\jdk\bin\javaw.exe -client -classpath C:\oracledevday\jdeveloper\j2ee\home\oc4j.jar;C:\oracledevday\jdeveloper\jdev\lib\jdev-oc4j-embedded.jar -Xverify:none -DcheckForUpdates=adminClientOnly -Doracle.application.environment=development -Doracle.j2ee.dont.use.memory.archive=true -Doracle.j2ee.http.socket.timeout=500 -Doc4j.jms.usePersistenceLockFiles=false oracle.oc4j.loader.boot.BootStrap -config C:\oracledevday\jdeveloper\jdev\system\oracle.j2ee.10.1.3.39.14\embedded-oc4j\config\server.xml
[waiting for the server to complete its initialization...]
2006-10-12 22:47:17.250 NOTIFICATION JMSServer[]: OC4J JMS server recovering transactions (commit 0) (rollback 0) (prepared 0).
2006-10-12 22:47:17.265 NOTIFICATION JMSServer[]: OC4J JMS server recovering local transactions Queue[jms/Oc4jJmsExceptionQueue].
2006-10-12 22:47:22.609 ERROR J2EE HTTP-00004 Internal error raised tyring to instantiate web-application: webapp defined in web site OC4J 10g (10.1.3) Default Web Site. Application: datatags does not exist. Error creating Web application: webapp
Ready message received from Oc4jNotifier.
Embedded OC4J startup time: 14015 ms.
Target URL -- http://10.10.10.10:8988/MyDemo/faces/pages/EmployeesTable.jspx
06/10/12 22:47:22 Oracle Containers for J2EE 10g (10.1.3.1.0) initialized
22:47:26 WARN (Digester) -[ConverterRule]{faces-config/converter} Merge(javax.faces.Short,null)
22:47:26 WARN (Digester) -[ConverterRule]{faces-config/converter} Merge(null,java.lang.Short)
22:47:26 WARN (Digester) -[ConverterRule]{faces-config/converter} Merge(javax.faces.Byte,null)
22:47:26 WARN (Digester) -[ConverterRule]{faces-config/converter} Merge(null,java.lang.Byte)
22:47:26 WARN (Digester) -[ConverterRule]{faces-config/converter} Merge(javax.faces.Integer,null)
22:47:26 WARN (Digester) -[ConverterRule]{faces-config/converter} Merge(null,java.lang.Integer)
22:47:26 WARN (Digester) -[ConverterRule]{faces-config/converter} Merge(javax.faces.Long,null)
22:47:26 WARN (Digester) -[ConverterRule]{faces-config/converter} Merge(null,java.lang.Long)
22:47:26 WARN (Digester) -[ConverterRule]{faces-config/converter} Merge(javax.faces.Float,null)
22:47:26 WARN (Digester) -[ConverterRule]{faces-config/converter} Merge(null,java.lang.Float)
22:47:26 WARN (Digester) -[ConverterRule]{faces-config/converter} Merge(javax.faces.Double,null)
22:47:26 WARN (Digester) -[ConverterRule]{faces-config/converter} Merge(null,java.lang.Double)
22:47:26 WARN (Digester) -[ValidatorRule]{faces-config/validator} Merge(javax.faces.LongRange)
22:47:26 WARN (Digester) -[ConverterRule]{faces-config/converter} Merge(javax.faces.DateTime,null)
22:47:26 WARN (Digester) -[ConverterRule]{faces-config/converter} Merge(javax.faces.Number,null)
22:47:27 WARN (Digester) -[NavigationRuleRule]{faces-config/navigation-rule} Merge(*)
22:47:27 WARN (Digester) -[NavigationRuleRule]{faces-config/navigation-rule} Merge(*)
22:47:27 WARN (Digester) -[NavigationRuleRule]{faces-config/navigation-rule} Merge(/pages/EmployeesTable.jspx)
22:47:27 WARN (Digester) -[NavigationRuleRule]{faces-config/navigation-rule} Merge(/pages/DepartmentsTable.jspx)
22:47:27 WARN (Digester) -[NavigationRuleRule]{faces-config/navigation-rule} Merge(/pages/LocationsTable.jspx)
22:47:27 WARN (Digester) -[NavigationRuleRule]{faces-config/navigation-rule} Merge(/pages/CountriesTable.jspx)
22:47:27 WARN (Digester) -[NavigationRuleRule]{faces-config/navigation-rule} Merge(/pages/RegionsTable.jspx)
22:47:27 WARN (Digester) -[NavigationRuleRule]{faces-config/navigation-rule} Merge(/pages/JobsTable.jspx)
2006-10-12 22:47:29.546 TRACE Setting JAZN Config property ...
2006-10-12 22:47:29.625 NOTIFICATION ---- JAZNSecurityContext.getUserPrincipal(): NULL
2006-10-12 22:47:32.015 NOTIFICATION ADF Faces is running with time-stamp checking enabled. This should not be used in a production environment. See the oracle.adf.view.faces.CHECK_FILE_MODIFICATION property in WEB-INF/web.xml
22:47:32 DEBUG (JhsPageLifecycle) -Executing prepareModel, page=/pages/EmployeesTable.jspx, pagedef=EmployeesPageDef
22:47:32 DEBUG (JhsNavigationHandlerImpl) -Executing checkRoles
22:47:32 DEBUG (BreadcrumbStack) -Adding breadcrumb to stack: "Employees" (/pages/EmployeesTable.jspx)
22:47:32 DEBUG (JhsPageLifecycle) -Executing prepareRender, page=/pages/EmployeesTable.jspx, pagedef=EmployeesPageDef
22:47:32 DEBUG (BreadcrumbStack) -Breadcrumb already on stack; rolling back the stack
22:47:32 DEBUG (BreadcrumbStack) -Adding breadcrumb to stack: "Employees" (/pages/EmployeesTable.jspx)
2006-10-12 22:47:34.468 ERROR
Please advise and let me know if you need any other information from me.
Thanks,
Magesh.

Thanks Steven.
That makes sense. Is there anything I can do to make this demo work without de-installing 10.1.3.1 Preview? Or If I also install 10.1.3.0.4 with SU5 on another folder, does that affect my 10.1.3.1 Preview version?
I'm using 10.1.3.1 Preview version to learn Oracle's SOA suite.
Thanks again,
Magesh.

Issue with Steve Muench's latest eg. How to resolve it?

I have gone through the example "Compelling Dialog" By Steve Muench. Which is available at below link
"http://www.oracle.com/technology/oramag/oracle/10-jul/o40frame.html";
This example is perfectly good even great. There are two issues with this example which i have found and need a solution for those
1. Any LOV or error message that opens from the popup is confined within the pop-up window. Resulting in ugly looks and a tedious way to maneuver. How to work this out?
2. I don't want to give any width or height for this popup. It should adjust as per the required width of the fields.
I have issues with above mentioned two problems. Can any of you come up with the solution of above two problem.
I am working with JDEV11.1.1.2.0 with ADF11g
Thank You in advance

I have had exactly the same problem now with two mini iPads. Everything was tried; 1) restarting; 2) restoring factory settings etc. NONE worked. Eventually Apple agreed to replace it. I have had the replacement now for two to three months and exactly the same thing is happening again. So off to Apple tomorrow to get another replacement.
I am quite a heavy user of the iPad so wonder if this is something to do with the fault.
It is so frustrating as sometimes reset works, and then after 10/20/30/40 minutes (you pick) it goes unstable again.

How to implement command pattern into BC4J framework?

How to implement command pattern into BC4J framework, Is BC4J just only suport AIDU(insert,update,delete,query) function? Could it support execute function like salary caculation in HR system or posting in GL(general ledger) system? May I create a java object named salaryCalc which use view objects to get the salary by employee and then write it to database?
Thanks.

BC4J makes it easy to support the command pattern, right out of the box.
You can write a custom method on your application module class, then visit the application module wizard and see the "Client Methods" tab to select which custom methods should be exposed for invocation as task-specific commands by clients.
BC4J is not only for Insert,Update,Delete style applications. It is a complete application framework that automates most of the typical things you need to do while building J2EE applications. You can have a read of my Simplifying J2EE and EJB Development Using BC4J whitepaper to read up on an overview of all the basic J2EE design patterns that the framework implements for you.
Let us know if you have more specific questions on how to put the framework into practice.

For those who used the solution by Steve Muench,Dynamic JDBC Credentials

hi every body
is there any body used the solution by Steve Muench, Dynamic JDBC Credentials .
thanks
Yaser
Edited by: 842127 on Mar 13, 2011 9:24 AM

Hi,
in the login page i have a button to make login which work perfect
How can you say ?
Whenever i click any control in the login page i see this message invalid username/passowrd . i do not why i face this problem ?I have tried changing the username,password and database using http://www.oracle.com/technetwork/developer-tools/jdev/dynamicjdbchowto-101755.html which works perfect.
refer my thread
Changing the database for a particular user session
Regards,
Santosh
Edited by: Santosh Vaza on Mar 17, 2011 11:29 AM

Dynamic JDBC Credentials: Example 14 from Steve Muench

Hi,
Im trying example from Steve Muench, it's working fine.
But I have some questions about it.
If I want to connect to the db with a wrong username/password I see that it tries 5 times to connect to the database, Where Can I change this number of retries?
Before the password should be used, it must be encrypted. I have two encryption methods, wich one should be used varies.
If the first encryption gives a wrong result(no login) the second encryption should be used.
What is a good place to encrypt the password?
I was thinking of DynamicJDBCSessionCookieFactory because that is called more than 1 time if login fails.

I placed my code to encrypt now in the DynamicJDBCBindingFilter.
This how I try to connect twice
catch (Exception e) {
                    if (isFailedLoginException(e)) {
                        System.out.println("Poging="+poging);
                        attemt+=1;
                        if (attemt<3){
                            FacesContext    fctx = FacesContext.getCurrentInstance();
                            ExternalContext ectx = fctx.getExternalContext();
                            HttpSession session2 = (HttpSession)ectx.getSession(false);
                            if (session2 != null) {
                              session2.invalidate();
                            this.doFilter(request,response,chain);
                        }else{
                            signalFailedLoginAttempt(svrRequest);
                            redirectToLoginPageOnLogonError(request, response);
                    }As you can see I invalidate the session and then I call doFilter again.
This is almost working, but when I'm forwarded to main.jsp with the table I see access denied istead of the table, I also get this error on the Jdev console:
08/03/25 15:09:14 java.lang.IllegalStateException: Session was invalidated
08/03/25 15:09:14      at com.evermind.server.http.EvermindHttpSession.setAttribute(EvermindHttpSession.java:151)
08/03/25 15:09:14      at test.DynamicJDBCBindingFilter.doFilter(DynamicJDBCBindingFilter.java:84)
08/03/25 15:09:14      at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:621)
08/03/25 15:09:14      at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:370)
08/03/25 15:09:14      at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:871)
08/03/25 15:09:14      at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:453)
08/03/25 15:09:14      at com.evermind.server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:221)
08/03/25 15:09:14      at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:122)
08/03/25 15:09:14      at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:111)
08/03/25 15:09:14      at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
08/03/25 15:09:14      at oracle.oc4j.network.ServerSocketAcceptHandler.procClientSocket(ServerSocketAcceptHandler.java:239)
08/03/25 15:09:14      at oracle.oc4j.network.ServerSocketAcceptHandler.access$700(ServerSocketAcceptHandler.java:34)
08/03/25 15:09:14      at oracle.oc4j.network.ServerSocketAcceptHandler$AcceptHandlerHorse.run(ServerSocketAcceptHandler.java:880)
08/03/25 15:09:14      at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
08/03/25 15:09:14      at java.lang.Thread.run(Thread.java:595)
The session is invalidated, but If I don't to that it looks like that the new login credentials are not used. Because then I go back to the login page and see the message that the login\password was not correct.
Someone who knows what I do wrong? I realy need to know this!!
Message was edited by:
KdeGraaf

Q&A interview with Steve Muench published

Steve Muench has been kind enough to allow me to web-publish a Q&A interview with him that I wrote and was published in 2006 AUSOUG Summer Foresight magazine edition.
The article has been published here for your reading pleasure:
http://one-size-doesnt-fit-all.blogspot.com/
Regards,
CM.

nice and keep up the good work
fadi hasweh
http://oracle-magic.blogspot.com/
Oracle is not Magic, it just takes years of experience

Example 5-11 in Steve Muench's Oracle-XML book

Hi,
Anyone who studied the book Building Oracle XML Applications by Steve Muench (O'Reilly), could clarify this query. When I tried to execute Example 5-11:Test,Extract and Retrieve an XPath Expression Value (page 132) I get the following error:
PLS-00307: too many declarations of 'SELECTNODES' match this call (complete source code given at the end of this message).
Could you please explain why this error is occurring.
Best wishes,
Balu
Code
SQL> SET SERVEROUTPUT ON
SQL> DECLARE
2 doc xmldom.DOMDocument;
3 approvers xmldom.DOMNodeList;
4 PROCEDURE p(msg VARCHAR2, nl BOOLEAN := TRUE) IS BEGIN
5 dbms_output.put_line(msg);IF nl THEN dbms_output.put(CHR(10)); END IF;
6 END;
7 FUNCTION yn(b BOOLEAN ) RETURN VARCHAR2 IS
8 BEGIN IF b THEN RETURN 'Yes'; ELSE RETURN 'No'; END IF; END;
9 BEGIN
10 doc := xml.parse(BFileName('XMLFILES','claim77804.xml'));
11
12 p('What is the value of the Policy number for this claim?');
13 p( xpath.valueOf(doc,'/Claim/Policy') );
14
15 p('Does this claim have any settlement payments over $500 approved by JCOX?');
16 p(yn(xpath.test(doc,'//Settlements/Payment[. > 500 and @Approver="JCOX"]')));
17
18 -- Demonstrate Saving and Re-getting the XML document
19 xmldoc.save('claim77804',doc);
20 doc := xmldoc.get('claim77804');
21
22 p('What is XML document fragment contained by the <DamageReport> element?');
23 p(xpath.extract(doc,'/Claim/DamageReport'));
24
25 p('Who approved settlement payments for this claim?');
26 approvers := xpath.selectNodes(doc,'/Claim/Settlements/Payment');
27 FOR j IN 1..xmldom.getLength(approvers) LOOP
28 p(xpath.valueOf(xmldom.item(approvers,j-1),'@Approver'),nl=>FALSE);
29 END LOOP;
30 xml.freeDocument(doc);
31 END;
32
33 /
DECLARE
ERROR at line 1:
ORA-06550: line 26, column 16:
PLS-00307: too many declarations of 'SELECTNODES' match this call
ORA-06550: line 26, column 3:
PL/SQL: Statement ignored

I tried the wayback machine, but unfortunately, it doesn't cache the SWF files either :( I do have a copy of some (ok one) of Steve's old videos (the one that shows how to do a dropdown list in an editable table, back before it was easy to do), but unfortunately, none of the search ones.
John

BeginRequest on previously used DataControls (for Oracle guys/Steve Muench)

Hi,
We are using JDeveloper 10g (10.1.2.1.0) and ADF BC+JSP in our application.
In our developer team, in tuning tasks we have detected, that all DataControls that were been used be the user in the past (same session) are activated each request (beginRequest) that user realizes, activated and taking an AM out of the pool and maybe this AM not will be used in this request, and maybe neither in any other future request from the user. Then we have that each AM that were used in the past by the user, must will be activated/passivated if pool is small size limited or pool must will be oversized (server big load situations).
When the user ends using this AM, we call its resetState method, like is recommended by Steve Muench at
Re: application modules and a logoff event (for Steve Muench)
but the next ones user requests will make the ADFBindingFilter call beginRequest on all previous AM anyway. Seems that initially the user BindingContext contains references to DataControls (DCDataControlReference) but when the user uses/gets an DataControl its reference is replaced with the real DataControl instance (DCJboDataControl), and seems that DCJboDataControl.beginRequest, gets an AM instance out of pool, I think that this will make that the AM will not be expired/cleared by the PoolMonitor.
We have hard coded a test in our application that seems to work with the normal ADF and application lifecycle (but I don't like this test too much, too much low level coding), basically the DataControl is replaced by its reference when the user ends using it.
And now the questions. Is it a normal situation? Why we must suppouse that all the AM/DataControl previously used by the user will be used in the current request? There's a normal way to do this, maybe a method that when the DataControl is marked with a flag releases it till the next time user needs it (I'd try release(int) and it didn't works in this way)? Any suggestions/explanations about this?
Comments will be very well received. Thanks in advanced.

Hi Steve,
firstly, thank you very much for your so fast answer.
Ok, I'll open a TAR in metalink. I've searched for the bug# 4566186 in metalink, but I didn't found nothing in metalink for this bug number.

"Dive into BC4J" by Steve Muench

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