UseBean Scope Problems

I'm using apache and gnujsp 1.0 to run JSP on my webserver. I need a bean that exists for an entire session so I can validate that a user has indeed logged in and is just not explicitly referencing a jsp page. However, the login bean I created is having problems running with a scope of "session" or "application". It works fine with a scope of "page", but with anything else I get a ClassCastException.
Heres my code to instantiate the bean:
<jsp:useBean id="ihcDB" scope="session" class="IHCbean" />
Any Ideas?

Try to use Oracle JSP to see whether you got the same problem. OJSP also runs on Apache/JServ.
null

Similar Messages

Scop problem

Hi ,
I having a problem communicating with loaded swf inside main
file.
Im using that script to have a transition between external
swf :
http://www.kirupa.com/developer/mx2004/transitions.htm
most of it working fine but im having problem communicating
with variable:
Stage.swf:
The main movie start to play and on its last frame it has the
following action:
this._lockroot=true
//loading the first movie after the animation finish
_root.currMovie = "main";
_root.MC_Container.loadMovie(_root.currMovie+".swf");
stop();
portfolio.swf
Than I press on the portfolio button and I get another main
portfolio swf that has external files loeaded as well.its dividing
the portfolio into categories , each category loading external
file.
First frame:
this._lockroot=true
_root.currMovie = "portfolio_3d";
_root.MC_Container.loadMovie("portfolio_3d.swf");
midframe=10;
stop();
buttons :
on (release) {
if (_root.currMovie == undefined) {
_root.currMovie = "portfolio_print";
_root.MC_Container.loadMovie("portfolio_print.swf");
} else if (_root.currMovie != "portfolio_print") {
if (_root.MC_Container._currentframe >=
_root.MC_Container.midframe) {
_level.currMovie = "portfolio_print";
_root.MC_Container.play();
portfolio_3d.swf
the external file that loaded into the portfolio file is for
example : portfolio_3d.swf ,
the first frame action:
this._lockroot=true
midframe=10;
middle frame has a stop(); command
the last frame loading the next after the current movie
finish:
_root.MC_Container.loadMovie(_root.currMovie+".swf")
the problem is that in the portfolio page, when I click the
sub categries(3d,print,etc) , I get always the same movie. It seems
like the variable doesn’t see the movie in the lowest level.
It seems like a scop problem
my url :
www.shaygaghe.co.il
thanks for your time ,
Shay Gaghe

what is the script that you have on the buttons on the bottom
of the page that are supposed to load the new content? I think it
may have something to do with your lockroot.

Variable scope problem?

I am not quite sure if this is a scope problem at all, but it looks like one....
Here is the problem:
I have a class in which I define a variable x as folowing:
public class XX
public var x:Integer;
In my fx script file I give it a value:
var t: XX {
x: 10
and it seems that it is initialized... however when I try to use the variable inside the class XX, it cannot be done.
for example I what try to do is
public var yy = YY {
for (i in [1..x]){
...do something...
and the cycle is executed only once!
Is this due to my inexperience in javafx or it is a standard behavior?

Is this due to my inexperience in javafx or it is a standard behavior? Both? :-)
The classical way to compute a class variable from those initialized at construction time is to do that in an init (or postinit) block.
It isn't really a problem of scope, rather of order of initialization.

Function scope problem

Hi all,
I am using a class-based system for all my actionscript, but
am having trouble getting the following code to work properly, and
I am pretty certain it is a scope issue.
public function
setNavButtons(prevStart:Number,prevEnd:Number,nextStart:Number,nextEnd:Number){
var owner = this;
if (prevStart != undefined){
mcPropertiesNav.btnBack.onRelease = function():Void{
owner.reloadView(prevStart,prevEnd);
if (nextStart != undefined){
mcPropertiesNav.btnNext.onRelease = function():Void{
owner.reloadView(nextStart,NextEnd);
I've traced it out and know that when I use the reloadView
method, the prevStart and prevEnd parameters are being passed in as
undefined. Does anyone know how I would reference these variables
within the onRelease functions?
Thanks in advance
Robert

In the code you are posting a scope problem can't be
pinpointed. The arguments you are providing are local to the
function so there is no problem there. We might be able to help if
you post the complete class.

Scope problem

here is the function:
public void readVector(File file)
AddressBook addressBook = new AddressBook();
try
String string, token1 ="", token2 ="", token3 ="", token4 ="",
token5 ="", token6 ="";
FileInputStream fis1 = new FileInputStream(file);
BufferedReader in = new BufferedReader(new FileReader(file));
StringTokenizer st;
while((string = in.readLine()) != null )
st = new StringTokenizer(string);
token1 = (st.hasMoreTokens())?st.nextToken():"";
token2 = (st.hasMoreTokens())?st.nextToken():"";
token3 = (st.hasMoreTokens())?st.nextToken():"";
token4 = (st.hasMoreTokens())?st.nextToken():"";
token5 = (st.hasMoreTokens())?st.nextToken():"";
token6 = (st.hasMoreTokens())?st.nextToken():"";
Contact c = new Contact(token1, token2, token3, token4, token5, token6);
addressBook.addContact(c);
catch(Exception ex)//catch exception and print stacktrace if try fails
ex.printStackTrace();
problem- some how I need to return the addresBook to another class, I can't do this because of a scope problem. Also if a solution is possible how would I call teh function in my other class.
if this function returns an addressbook
the prototype would be:
AddressBook readVector(File file);
how would I call this functino from another class to obtain the addressbok.

I dont know what you mean by scope problem. Maybe you wanna elaborate on that a bit more. However, returning AddressBook should be straightforward. You can actually do it in two slightly different ways.
1. You can define your readVector() method to be static:
public static AddressBook readVector(whatever arguments) {
....your code here...
Assuming you defined this method in class "foo", you can call this method using foo.readVector(arguments). In your calling function, you will probably have something like:
AddressBook addressbk = foo.readVector(arguments);
2. If you dont want to make your readVector() static, you will have to instantiate the class which contains this method. Again assuming class "foo" contains a definition like:
public AddressBook readVector(args) {
....your code...
In your calling method you will do the following:
foo foo_obj = new foo();
AddressBook addrbk = foo_obj.readVector(arguments);
Of course, in either case your foo class has to be visible to the calling method. If your foo class is part of a different package, you will need to import it in the calling class.

Beans scope problem

Hi
I have a bean that stores the name of the user after they have logged in. It is supposed to be in session scope
<jsp:useBean id="userInfo" class="beans.UserInfo" scope="session"/>But it appears to have been placed in application scope. It doesn't timeout and all subsequent users appear to be logged on as the first user. This is not good.
Any suggestions? I'll post the code once I've made a minimal version of the problem.
Thanks
Richard

Here's the code
the bean: UserInfo.class
package beans;
public class UserInfo implements java.io.Serializable {
private static boolean loggedIn=false;
private static String user="";
public UserInfo() { }
public static void setLoggedIn(boolean b){loggedIn=b;}
public static void setUser(String b){user=b;}
public static boolean isLoggedIn(){return loggedIn;}
public static String getUser(){return user;}
}main jsp page test.jsp
<jsp:useBean id="userInfo" class="beans.UserInfo" scope="session"/>
<jsp:include page="header.jsp" flush="true">
   <jsp:param name="title" value="Test" />
</jsp:include>
<%
boolean login=Boolean.valueOf(request.getParameter("login")).booleanValue();
if(login){
      userInfo.setLoggedIn(true);
      userInfo.setUser("strUsr");
%>
<p><b>mainpage says</b>
<%if (userInfo.isLoggedIn()) {%> <%=userInfo.getUser()%> logged in
         <%}else {%>not logged in
            <%}%>
</body>
</html>The included file header.jsp
<jsp:useBean id="userInfo" class="beans.UserInfo" scope="session"/>
<html>
<head>
<title><%=request.getParameter("title")%></title>
</head>
<body>
<p><b>header says</b>
<%if (userInfo.isLoggedIn()) {%> <%=userInfo.getUser()%> logged in
         <%}else {%>not logged in
            <%}%>load test.jsp?login=true in a browser
load test.jsp in another browser - should not appear logged in - but does at least with my system (tomcat 5.5.9 on windows xp)
Any suggestions,
Richard

Application scope problem in a JSP

Hi,
I try to store an object with the following code :
getServletContext().setAttribute("application", app);
Later I want to access this object from a JSP with :
<jsp:useBean id="application" scope="application" class="de.skillworks.SWApp"/>
that dosn't work !? I can not debug my application because the jsp is initializing my app object new. When I try in my JSP :
SWApp app = (SWApp)pageContext.getServletContext().getAttribute("application");
it works fine. I get my object which I have store in my servlet.
In a Tomcat environment my code is working just the Jdeveloper has a problem with it.
null

Andy -
The web-to-go server has difficulty dealing with sessions. Testing in Tomcat is a good alternative, and this is resolved in Oracle9i JDeveloper.
Hope this helps,
Lynn

JSP with useBean beginner problems need help

I start to learn JSP and now I am facing a problem which cannot be solved for a whole day.
I make a simple JSP and want to use a my defined class to make some logic outside JSP file. It can be built by "ant build".
But there is always an error-message when I see through browser. Also, I have already "ant deploy" to copy all classes in WEB-INF/classes/...
Besides, my tomcat can run JSP without importing external class or javaBean.
Please help. I really have no idea. Thanks.
The simple Converter.class in Test.Beans package
package Test.Beans;
import java.math.*;
public class Converter {
     static BigDecimal yenRate = new BigDecimal("131.7800");
     static BigDecimal euroRate = new BigDecimal("0.0084");
public BigDecimal dollarToYen(BigDecimal dollars) {
BigDecimal result = dollars.multiply(yenRate);
return result.setScale(2,BigDecimal.ROUND_UP);
public BigDecimal yenToEuro(BigDecimal yen) {
BigDecimal result = yen.multiply(euroRate);
return result.setScale(2,BigDecimal.ROUND_UP);
public Converter() {}
The simple JSP:
<%@ page import="java.math.*" %>
<jsp:useBean id="c" class="Test.Beans.Converter" scope="page"/>
<html>
<head>
     <title>Converter</title>
</head>
<body bgcolor="white">
     <FONT SIZE=+1>
     <h1><center>Converter</center></h1>
     <hr>
     <p>Enter an amount to convert:</p>
     <form method="get">
     <input type="text" name="amount" size="25">
     <br>
     <p>
     <input type="submit" value="Submit">
     <input type="reset" value="Reset">
     </form>
     <%
     String amount = request.getParameter("amount");
          if ( amount != null && amount.length() > 0 ) {
          BigDecimal d = new BigDecimal (amount);
     %>
     <%= c.yenToEuro(d) %> Euro.
     <%
     %>
     </FONT>
</body>
</html>
Here is the error message:
org.apache.jasper.JasperException: /main.jsp(2,0) The value for the useBean class attribute Test.Beans.Converter is invalid.
     org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
org.apache.jasper.JasperException: /main.jsp(2,0) The value for the useBean class attribute Test.Beans.Converter is invalid.
     org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
     org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:405)
     org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:146)
     org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1174)
     org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1116)
     org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
     org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213)
     org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219)
     org.apache.jasper.compiler.Node$Root.accept(Node.java:456)
     org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
     org.apache.jasper.compiler.Generator.generate(Generator.java:3304)
     org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:295)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:276)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:264)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:303)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
Message was edited by:
BillyHui

Works fine for me, copied and pasted exactly.
Try recompiling your java class again, to make sure it is valid.
Check that the class file is copied into the correct place by your ant build.
Should be WEB-INF/classes/Test/Beans/Converter.class

useBean action problem ??

hi all !
first of all sorry from my english(very poor) .
my question is:
i have to Jsp's pages "first.jsp" & "second.jsp".
in "first.jsp" iam written
<jsp:useBean id="Admin" scope="application" class="myBeans.Administrator" />
and iam also written in "second.jsp" <jsp:useBean id="Admin" scope="application"
class="myBeans.Administrator" />
my problem is: when i acceess the "first.jsp" in the first time my bean is create >> no problem
and when access "first.jsp" again my bean is exist so is not create new object >> no problem
but the problem is when i access the "second.jsp" ,new bean is created why ???
again sorry for my english :-)
thanks

If you want to have it find the bean if it exist or create it if it doesn't, you have to use the following syntax in all places:
<jsp:usebean ....>
<do something/>
<jsp:usebean/>
note the loop construct
http://www.apl.jhu.edu/~hall/java/Servlet-Tutorial/

Having Truble Reading and Echoing Using PHP in HTML. Possible Variable Scope Problem?

Hey guys,
   Thanks for your always knowledgable help! Today I am working with displaying text from a text file in an HTML table using PHP. I can't get the data to display properly, I think it has something to do with the scope of the variables, but I am not sure. Here is the code I am struggeling with:
<table width="357" border="1" cellspacing="0" cellpadding="0">
<tr>
    <td width="165">Pizza 1</td>
    <td width="186"><? echo $price['0']; ?></td>
</tr>
<tr>
    <td>Burger 1</td>
    <td><? echo $price['1']; ?></td>
</tr>
<tr>
    <td>Drink 1</td>
    <td><? echo $price['2']; ?></td>
</tr>
</table>
In the above PHP (not shown) the array $price is filled properly (I tested by echoing each bit line by line) but by the time we get into the HTML it seems the array is empty or it is not liking how I am calling it. Does the scope of a PHP variable end with the closing "?>" tag? Am I missing something? Bellow is the full code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<style type="text/css">
body {
    background-color: #333;
    color: #FFF;
</style>
</head>
<body>
<?php
$menu=fopen("prices.txt","r") or exit("Unable to open file!");
$price=array();
$priceposition=null;
$tempstring;
//This loop does all of the READING and populating of variables
while(!feof($menu))
    //Check to see if this is the first pass, if not add one to the array possition
    if ($priceposition==null){
        $priceposition=0;
    else{
    $priceposition++;
    //populate the temparary string
    $tempstring = fgets($menu);
    //Populate the array if the temporary string is not a comment
    if(substr($tempstring,0,2) != "//"){
        $price['$priceposition']= $tempstring;
        echo $price['$priceposition'];
//End of reading loop
fclose($menu);
?>
<table width="357" border="1" cellspacing="0" cellpadding="0">
<tr>
    <td width="165">Pizza 1</td>
    <td width="186"><? echo $price['0']; ?></td>
</tr>
<tr>
    <td>Burger 1</td>
    <td><? echo $price['1']; ?></td>
</tr>
<tr>
    <td>Drink 1</td>
    <td><? echo $price['2']; ?></td>
</tr>
</table>
</body>
</html>
and you can run the code on my test server here: christianstest.info/phptest/readwritetesting/readtest.php
thanks guys!

MurraySummers wrote:
Try changing this -
fclose($menu);
to this -
fclose($menu);
echo "<pre>";exit(print_r($price));
and see what you get.
Wow, what a great little peice of testing code, thanks! That showed me the problem right away! Is there any way to test your php line by line in Dreamweaver CS6? I am used to computer programing in Visual Studio and Eclipse where they have an option of running code line by line and seing how variables populate and change with each line of code execution. Or is thier a program that can do this for PHP?

JSF 2.0: View Scope Problem

Hey,
I 'm having trouble using the JSF 2.0 view scope. My application is a search page displaying some search parameters and a list of results. The search parameters are backed by a session scope bean, the results a backed by a request scoped bean and there is some kind of controller bean in request scope, too. Searching and displaying the results works fine.
The second step was some kind of details page to display when clicking on one result element. I have another controller bean for this goal, but when pressing the link the requested action is not performed. I remembered similar problems I had in the past where I put the bean containing the result list into view scope.
But after putting the results bean into view scope searching is not working anymore. You click the search button, the search action is performed. But after successfully storing the results a new results bean is instantiated. An empty one of course.
Now I 'm not sure anymore if I understand the view scope: I have a single page, I search something and the results are displayed on the same page. I cannot believe that request scoped results work fine and view scoped results do not.
Can anyone help me?
Thanks,
Stephan

I found the problem and a solution :-) The missing piece of the puzzle was the id attribute for the form tag. After some debugging of the JSF JavaScript I found the solution.
The JavaScript function response(request, context) is invoked to handle the server response. Inside this function the doUpdate(element, context) is invoked.
The doUpdate() function is doing the modification of the DOM. The function doUpdate() is two times invoked for a response. The first time the html elements are updated.
The second time the view state hidden field is updated or created but only under the following condition:
Comment in the JavaScript source code of the jsf.js
//Now set the view state from the server into the DOM
//but only for the form that submitted the request.If the forms of the both side haven't the same id the form can't be found on the second page.
In the following way it is working:
page1.xhtml
<h:form id="myform">
        <h:commandLink value="Go to page 2" action="page2">
            <f:ajax render="@all" execute="@all"/>
        </h:commandLink>
</h:form>
.....page2.xhtml
<h:form id="myform">
            <h:commandLink value="Go to page 1" action="page1">
                <f:ajax render="@all" execute="@all"/>
            </h:commandLink>
</h:form>So always set an explicit id for each JSF tag.

Jsp:useBean scope!!!!

If you declare
<jsp:useBean id="test" scope="session" class="test" />
how can you release the session when you finish using the class???
or what is the ideal scope to used in send and response???
for example...
page A:
input form
page B:
process form
page C:
success process form...
user fill in input and press submit
page A send information to page B to process
if page B encounter error
responde back to page A with the current value input
else
send to page C inform user the successed process....
what scope should i use???
i cant use scope="page" cause the amount of field is too much...
is there a way to destroy the scope declared if i used session???
help!!!!!!
programmer in BIG Distress!!!! :~(

maybe you should declare like below:
<jsp:useBean id="test" scope="request" class="test" />

A pesky callback/scope problem?

Hello! I am having quite a time dealing with getting data passed around correctly and hope someone will be able to shed some light on the situation. Here is my setup... I have an AS3 project communicating with an FMSv4 which is in turn communicating with a remoting server. The mockup is like so - I am doing it from memory and not copy and paste so ignore any actual programming problems... it is the data scope issue I am trying to resolve :|
// AS3
var rsp:Responder = new Responder(r_success, r_failure);
connection.call("fms_function", rsp);
function r_success(obj:Object)
     trace("it worked "+ obj);
function r_failure(obj:Object)
     trace("it failed");
// FMS - main.asc - netconnection etc has been correctly defined.
Client.prototype.fms_function = function()
     mygateway.call("remote_function", remoting_handler());
     function remoting_handler()
          this.onResult(data)
          {trace("result received");
               return(data);          // ( 1 )
          this.onStatus(data)
               trace("whoops");
Okay, so that is the setup... as I said before please disregard possible errors in the syntax.. my code traces out correctly showing flow as expected and gets the data from the remoting server correctly. When the client calls the fms_function on the FMS it traces "it worked null", showing the data has not been returned through the method called in my main.asc. My problem is trying to get the data retrieved from the remoting server to return back through fms_function to the client function that called it, at point ( 1 ) above. I have nested it as above hoping the scope would resolve back to fms_function, however this fails. I have tried passing fms_function as a parameter into remoting_handler, but my attempts to pass remoting_handler(this) by reference, for example, failed. I have also tried not using a nested handler, but the data does not get returned through the fms_function method to the client. Using client.call and passing it back that way is not an option. How am I able to get the data from the remoting server to return to the client via fms_function? Any help would be appreciated. I have been trying for quite some time and have come up with a bunch of ways to not resolve my problem.

That is a good question... the reason I am trying to avoid using Client.call() is because the client is doing a sequenced configuration routine comprised of nested calls to the fms. The success handler of each call will contain the next call item in the sequence and a failure or incorrect data will cancel the configuration sequence. Using Client.call() will force me to set up client-side methods for each step in the sequence and effectively destroy the nesting. Because of this, the best approach, I thought, was to get the FMS to just pass the data back through the client-side calling function... unless there is a better option?

Quiz scope problems in Captivate 7

I have created a project that consists of a series of slides with quiz questions interspersed. For example:
Slide 1
Slide 2
Question 1
Question 2
Slide 3
Slide 4
Question 3
Question 4
Slide 5
Slide 6
Question 5
Question 6
(Result slide)
Summary
If the user fails the quiz he can either
retake it, or
review the submitted answers and the correct ones in preparation for retaking it.
If option 2 is taken the user should then be able to retake the quiz.The problem I have having is with this option (2); the questions stay in review mode even if I reload the course. I assume this must relate to the quiz scope.
Having looked at the blogs etc I thought that the quiz scope started at the first question and ended with the result slide. So I should be able to navigate to Slide 1 or the Summary and thereby reset the quiz. However when I do this and then return to Question 1 the quiz is still in review mode. I must be doing something wrong and would appreciate some guidance.
TIA
Andrew

Sorry but Review/Retake process for regular question slides is not as you expect (by design): if the user Reviews, he cannot use any other attempt on Quiz level, even though he didn't exhaust his attempts.
Have a look at: http://blog.lilybiri.com/question-question-slides-in-captivate and http://blog.lilybiri.com/question-question-slides-part-2
This is not linked with the quiz scope at all. Quiz scope's role is, when the user gets out of the scope, that quiz attempt is considered being finished. In Captivate 6 and later, the quiz scope has become dynamic if you use Remediation feature.
Lilybiri

Datatable: reuqest scope problem

Hi everyone
Im using A textfield where the user can input a searchstring. After he submits, a datatable is shown (dynamically generated) with the search results.
My problem is, after the user submits, the request bean is set to null again, so if i want to get the next page (paging function) also the datatable object in the bean is null again and thus cannot get the next rows.
I know i can avoid this problem by setting the bean scope to session, but actually im looking for a better solution. Can anyone help me? Im using JSF RI.
Thanks for your help.

One way of doing it is answered by BalusC
Another way of doing it is by using *<a4j:keepAlive>* tag. For more information regarding this tag please visit the following web site :
[http://livedemo.exadel.com/richfaces-demo/richfaces/keepAlive.jsf?c=keepAlive|http://livedemo.exadel.com/richfaces-demo/richfaces/keepAlive.jsf?c=keepAlive]

UseBean Scope Problems

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