Question about the jsp:useBean tag

Hi, I'm a relative newcomer to jsp, but the following piece of javascript code has me very confused:
<%@ page import="com.jinsoft.bank.web.*" %>
<jsp:useBean id="account" class="AccountBean" />
This will result in java.lang.ClassNotFoundException, and it complains that AccountBean cannot be found.
However, when I fully qualify the class, it works:
<%@ page import="com.jinsoft.bank.web.*" %>
<jsp:useBean id="account" class="com.jinsoft.bank.web.AccountBean" />
Am I doing something wrong?
Isn't the import tag supposed to help?
Thanks for any help!

Hi Kim
I'm really interested in the particular error that you are generating. I tried this out using Tomcat 3.2.3 and it doesn't seem to be a problem. What application Server are you using?
Another way to find out if the problem is with the Application Server is to check the .java file that is created out of the jsp page before it is compiled. Individual Application servers have different ways of storing this intermediate .java file but most of them keep it if the compilation does not succeed.
You may possibly have to file a bug if everything else checks out fine. Another point, are you able to import the same bean into a Servlet and use it there?
Keep us posted.
Good Luck!
Eshwar Rao
Developer Technical Support
Sun microsystems inc
http://www.sun.com/developers/support

Similar Messages

Hi, I have quick question about use of USEBEAN tag in SP2. When I specify a scope of SESSION for the java bean, it does not keep the values that I set for variable in the bean persistent.Thanks,Sonny

Make sure that your bean is implementing the serializable interface and that
you are accessing the bean from the session with the same name.
Bryan
"Sandeep Suri" <[email protected]> wrote in message
news:[email protected]..
Hi, I have quick question about use of USEBEAN tag in SP2. When I
specify a scope of SESSION for the java bean, it does not keep the
values that I set for variable in the bean persistent.Thanks,Sonny
Try our New Web Based Forum at http://softwareforum.sun.com
Includes Access to our Product Knowledge Base!

Need help with the jsp:useBean tag

Dear Fellow Java/JSP developers:
I am trying to use the <jsp:useBean> tag in a jsp that displays the values from a javaBean that gets populated by another class.
<%@ page contentType="text/html" pageEncoding="UTF-8"%>
<%@ page import = "java.util.ArrayList"%>
<%@ page import = "java.util.Iterator"%>
<%@ page import = "salattimes.CalendarParse" %>
<%@ page import = "salattimes.Salat" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <jsp:useBean id="test" scope="session" class="calendar.Time" />
        <% CalendarParse sTime = new CalendarParse();
            Time mytime = sTime.runExample();%>
        <%=mytime.getA() %>
        <%=mytime.getB() %>
        <%=mytime.getC() %>
        <%=mytime.getD() %>
        <%=mytime.getE() %>
    </body>
</html>However, up to now, I am only able to display the values on my JSP page using the scriptlet
<% CalendarParse sTime = new CalendarParse();
            Time mytime = sTime.runExample();%> to declare and create the object (the method call sTime.runExample(); populates the fields in the Java Bean), and the expressions:
<%=mytime.getA() %>
         <%=mytime.getB() %>
         <%=mytime.getC() %>
         <%=mytime.getD() %>
         <%=mytime.getE() %>to present the values on the screen. What I would like to do is assign the object that I create to a javaBean reference declared in a <jsp:useBean> tag as follows:
<jsp:useBean id="test" scope="session" class="calendar.Time" />
        <% CalendarParse sTime = new CalendarParse();
            test = sTime.runExample();%>and then present the values stored in the bean to the JSP page as follows:
<jsp:getProperty name="test" property="a" />
        <jsp:getProperty name="test" property="b" />
        <jsp:getProperty name="test" property="c" />
        <jsp:getProperty name="test" property="d" />
        <jsp:getProperty name="test" property="e" />
        <jsp:getProperty name="test" property="f" />Is this possible? When I try the above, I get "null" as my output on the screen. When I try the first approach listed above, I get the values I am looking for. Is there a way to accomplish this using the <jsp:useBean> approach?
Thanks to all those who reply.
Sincerely;
Fayyaz

The code:
<jsp:useBean id="calendar" class="calendar.CalendarParse" scope="session"/>
<c:set var="time" value="${calendar.time}"/>Would be roughly equivalant to:
calendar.CalendarParse calendar = new calendar.CalendarParse();
Object time = calendar.getTime();I assumed that the CalendarParse object was in the calendar package because that was were your Time class was (when you used <jsp:useBean id="test" scope="session" class="calendar.Time" />"), but when I look back at your original post I see I was wrong and the use of calendar as both the incorrect package and the variable name was confusing. To make the code more similar to your original post the code should have read:
<jsp:useBean id="sTime" class="salattimes.CalendarParse"/>
<c:set var="myTime" value="${sTime.time}" scope="session"/>
${myTime.a}
${myTime.b}
${myTime.c}
etc...Here is an explanation of the parts:
         /* name of the variable */ /* fully qualified class name, package.className */
<jsp:useBean id="sTime"           class="salattimes.CalendarParse"/>
/* name of the new object from bean */ /* source of object, variable.property */    /* Scope of new object */
<c:set var="myTime"              value="${sTime.time}"             scope="session"/>
/* data to display variable.property */
${myTime.a}Where a 'property' in a bean is defined as a method in the form of getProperty(). So the 'time' property is getTime() and the 'a' property is getA().

Question about the Documentation Tags for Source Code

Hello,
I have a question about CVI's automatic source code documentation. My problem is that is seems like you need to write all documentation for a specific tag on one line. If you don't, a line break will be inserted when the documentation is displayed. Suppose I want to write a large amount of documentation for the function itself, using the HIFN tag. If I don't want linebreaks to be forced in the documentation, I need to write all this documentation on one single line, which kinda messes up my code. If I split the documentation over several HIFN tags, the documentation displayed to the user might look messed up because of all the linebreaks. Is there any escape character I can put at the end of a line, allowing me to split the documentation of several HIFN lines without forcing linebreaks in the documentation?
Thanks!
GEMIDIS - Innovating Display Technology
HQ Ghent, Belgium

This information is certainly useful. Note, however, that it can also be found in the documentation
Tag
Description
/// HIFN help text
Specifies the help text for the function. Use multiple /// HIFN tags to display help text for the function on separate lines. To separate help text with an empty line, use /// HIFN on a line by itself. You also can use HTML tags, but you must enclose the tags in <HTML><BODY></BODY></HTML> tags.
Example
/// HIFN SampleFunction returns the value of a control.
int SampleFunction (int controlID, ctrlType controlType, char label[], double *value)
SomeAction;

Type="Class" in the jsp:useBean tag

Hi every one
I create a class named quiz containing four Strings question,answer1,answer2,answer3
I initialize them in the constructor.
I made four get methods ...getQuestion(), getAnswer1 ...and so on.
I made the class implement the serializable interface.
in the main i created an object of that class and stored it on a file with .ser extension and i do the following in the jsp page
<jsp:useBean id="anyID" BeanName="name of the .ser file" type="className--i put the class name--"/>
but he gives me classnotfoundexception for the classname in the type field.
what can i do?
thnx in advance.

what can i do?Make sure that the class "quiz" is available to your web app.
Should be under the web-inf/classes directory (in its package directory)
Regarding your Quiz class:
- It must be in a package
- Also that it has a public noargs constructor:
package myPackage
public Quiz(){
}This class file should be in web-inf/classes/myPackage/Quiz.class
Hope this helps,
evnafets

Question about the JSTL forEach tag

<c:forEach var = "someItem" items="${myBean.getItems}">
Is this possible if myBean (a Java Bean) contains a function called getItems, which behind the scenes queries the database and stores the results in a structure, such as a list... the list might be an ArrayList or perhaps my own structure which simply extends the ArrayList class.
The contents of this list will be another object. This object, for example say is a book, which then contains properties such as a title, author, etc.
Is this possible:
<c:forEach var = "someItem" items="${myBean.getItems}">
<c:out value = "${someItem.title}">
</c:forEach>
Or does the var HAVE to be a String?

I try to make and example and I am getting this error:
org.apache.jasper.JasperException: /test.jsp(13,0) According to TLD or attribute directive in tag file, attribute items does not accept any expressions
why?
jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core"%>
<jsp:useBean id="obj" scope="application" class="demo.TestPersona"/>
<html>
<head>
<title>beanDemo Tutorial</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
<c:forEach items="${obj.personas}" var="item">
<c:out value="${item.apellido}"/>
</c:forEach>
</BODY>
</HTML>
javaBean
package demo;
import java.util.*;
public class TestPersona {
Collection<Persona> personas = new Vector();
public TestPersona() {
personas.add(new Persona("Rodriguez", "Diego", new Date()));
personas.add(new Persona("Fernandez", "Gabriela", new Date()));
public Collection getPersonas() {
return personas;
package demo;
import java.util.*;
public class Persona {
String apellido = null;
String nombre = null;
Date edad = null;
public Persona(String apellido, String nombre, Date edad) {
this.apellido = apellido;
this.nombre = nombre;
this.edad = edad;
public String getApellido() {
return apellido;
}

Unable to use jsp:useBean tag

when I use
<jsp:useBean id="addressBean" class="AddressBean" scope="session"/>
I get the following error
Exception Details: org.apache.jasper.JasperException
Unable to compile class for JSP No Java compiler was found to compile the generated source for the JSP. This can usually be solved by copying manually $JAVA_HOME/lib/tools.jar from the JDK to the common/lib directory of the Tomcat server, followed by a Tomcat restart. If using an alternate Java compiler, please check its installation and access path.
So my question is how to use the <jsp:useBean> tag in JSC

Please see my message How to set developer's mode for oracle jsp engine.
As a very early warning of the future, this way of setting configuration paramemter in web.xml for oracle jsp engine will be deprecated in the next major version of oc4j and desupported probably later on. Yes, it is still supported in 10.1.3 and the next major version, though.

How to Implement jsp:useBean tags

Hi,
I hav a trouble with using the Tag jsp:useBean
Actually im using Tomcat4.1 webserver'
I created a java file and compiled that
When i included that class file,The Jsp Compiler seeming me a error that the Required class in not found
Actually wht my problem is that i cannot find out the storage locations for the corresponding files
I know where to save the jsp
but i need to know where to put the class file and its source.Bcz that one which i want to use in that tag{<jsp:useBean>}
I want to know what should i do
With Regards
Ganesh B

Beans are regular Java classes that follow particular conventions defined by the JavaBean's specification. The don't extend from a particular class, they aren't packaged in a particular package, and - germane to the question - they aren't located in a special place on the server. The classes which are loaded into the JSP by the <jsp:useBean> construct are located in the same location as other classes in a web application. They are located in the classes directory of the WEB-INF directory of the web application directory itself. Or, if you bundle your classes into a jar file, then the jar file will be located in the lib directory of the WEB-INF directory. In either case, remember to use packages for your classes including your beans.

How can i load A gui JTable bean through jsp:useBean tag in a jsp page

Hi,
i am chiranjit , i am in a jsp project . i am desparately looking a solution for below stated problem:
i want to make a jsp page for master entry , that why i want to load a GUI Java bean in my jsp page.This GUI Bean contaning a JTable in which allow grid type data entry in the jsp page. But i am unable load that bean in the jsp page through jsp:useBean tag in my page.So if you have any solution then send in the forum as early as possible.
Thank you
chiranjit

No can do. JSPs can only output plain HTML (and javascript...) They are not used like normal Java classes.
If you need a complex GUI then you might use an Applet instead. If you want to use a JSP then you are stuck using normal HTML components, like <table> <form...> <input type="text"> etc...

Calling an inner class in a jsp:usebean tag

Hi everybody !
Here's my problem : working in my project on multiple pages, I'm using inner classes/beans to limitate my '.java' files but I'm stuck when calling that 'inner-bean' in my jsp:usebean tag.
First, I tried to declare in the class parameter : 'class="MyPrincipalBean.theInnerBean" but jsp returns me a 'not found' message.
I tried an other issue with this :
'class="MyPrincipalBean$theInnerBean" but I encountered a 'Attempt to use a bean type without a void constructor in jsp:useBean tag (JSP 1.1 specification, 2.13.1)'. Since I can't find that specification, I'm sending an SOS.
Am I on the good way ? If somebody as encoutered that sort of problem, it would be very kind of you to help me.
Thanks for your help !
[email protected]

Thanks for your help!
I must recognize that my explainations weren't really precise.
My principal bean owns a table of my inner-class type :
public class FirstBean extends EntityBean {
private SecondBean[] tabSB;
public SecondBean[] getTabSB() {...}
public void setTabSB(SecondBean[] p_tabSB) {...}
public class SecondBean {...}
So I can call a specific bean from the tab in my Servlet for another page.
But I think I have the solution and I need your advise :
I tried this :
<jsp:useBean id="FirstBean" class="<...>.FirstBean" scope="session" />
<jsp:useBean id="SecBean" beanName="<...>.FirstBean$SecondBean" type="<...>.FirstBean$SecondBean" scope="request" />
And would you believe it ? It seems to work ! But I have to test this farther to be sure. What do you think of it ?

Re: Question about the Satellite P300-18Z

Hello everyone,
I have a couple of questions about the Satellite P300-18Z.
What "video out" does this laptop have? (DVI, s-video or d-sub)
Can I link the laptop up to a LCD-TV and watch movies on a resolution of 1080p? (full-HD)
What is the warranty on this laptop?

Hello
According the notebook specification Satellite P300-18Z has follow interfaces:
DVI - No DVI port available
HDMI - HDMI-out (HDMI out port available)
Headphone Jack - External Headphone Jack (Stereo) available
.link - iLink (Firewire) port available
Line in Jack - No Line in Jack port available
Line out Jack - No Line Out Jack available
Microphone Jack - External Micrphone Jack
TV-out - port available (S-Video port)
VGA - VGA (External monitor port RGB port)
Also you can connect it to your LCD TV using HDMI cable.
Warranty is country specific and clarifies this with your local dealer but I know that all Toshiba products have 1 year standard warranty and also 1 year international warranty. you can of course expand it.

A question about the impact of SQL*PLUS SERVEROUTPUT option on v$sql

Hello everybody,
SQL> SELECT * FROM v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0 Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
SQL>
OS : Fedora Core 17 (X86_64) Kernel 3.6.6-1.fc17.x86_64I would like to ask a question about the SQL*Plus SET SERVEROUTPUT ON/OFF option and its impact on queries on views such as v$sql and v$session. Here is the problem
Actually I define three variables in SQL*Plus in order to store sid, serial# and prev_sql_id columns from v$session in order to be able to use them later, several times in different other queries, while I'm still working in the current session.
So, here is how I proceed
SET SERVEROUTPUT ON; -- I often activate this option as the first line of almost all of my SQL-PL/SQL script files
SET SQLBLANKLINES ON;
VARIABLE mysid NUMBER
VARIABLE myserial# NUMBER;
VARIABLE saved_sql_id VARCHAR2(13);
-- So first I store sid and serial# for the current session
BEGIN
    SELECT sid, serial# INTO :mysid, :myserial#
    FROM v$session
    WHERE audsid = SYS_CONTEXT('UserEnv', 'SessionId');
END;
PL/SQL procedure successfully completed.
-- Just check to see the result
SQL> SELECT :mysid, :myserial# FROM DUAL;
    :MYSID :MYSERIAL#
       129   1067
SQL> Now, let's say that I want to run the following query as the last SQL statement run within my current session
SELECT * FROM employees WHERE salary >= 2800 AND ROWNUM <= 10;According to Oracle® Database Reference 11g Release 2 (11.2) description for v$session
http://docs.oracle.com/cd/E11882_01/server.112/e25513/dynviews_3016.htm#REFRN30223]
the column prev_sql_id includes the sql_id of the last sql statement executed for the given sid and serial# which in the case of my example, it will be the above mentioned SELECT query on the employees table. As a result, right after the SELECT statement on the employees table I run the following
BEGIN
    SELECT prev_sql_id INTO :saved_sql_id
    FROM v$session
    WHERE sid = :mysid AND serial# = :myserial#;
END;
PL/SQL procedure successfully completed.
SQL> SELECT :saved_sql_id FROM DUAL;
:SAVED_SQL_ID
9babjv8yq8ru3
SQL> Having the value of sql_id, I'm supposed to find all information about cursor(s) for my SELECT statement and also its sql_text value in v$sql. Yet here is what I get when I query v$sql upon the stored sql_id
SELECT child_number, sql_id, sql_text
FROM v$sql
WHERE sql_id = :saved_sql_id;
CHILD_NUMBER   SQL_ID          SQL_TEXT
0              9babjv8yq8ru3    BEGIN DBMS_OUTPUT.GET_LINES(:LINES, :NUMLINES); END;Therefore instead of
SELECT * FROM employees WHERE salary >= 2800 AND ROWNUM <= 10;for the value of sql_text I get the following value
BEGIN DBMS_OUTPUT.GET_LINES(:LINES, :NUMLINES);Which is not of course what I was expecting to find in v$sql for the given sql_id.
After a bit googling I found the following thread on the OTN forum where it had been suggested (well I think maybe not exactly for the same problem) to turn off SERVEROUTPUT.
Problem with dbms_xplan.display_cursor
This was precisely what I did
SET SERVEROUTPUT OFFafter that I repeated the whole procedure and this time everything worked pretty well as expected. I checked SQL*Plus documentation for SERVEROUTPUT
and also v$session page, yet I didn't find anything indicating that SERVEROUTPUT should be switched off whenever views such as v$sql, v$session
are queired. I don't really understand the link in terms of impact that one can have on the other or better to say rather, why there is an impact
Could anyone kindly make some clarification?
thanks in advance,
Regards,
Dariyoosh

>
and also v$session page, yet I didn't find anything indicating that SERVEROUTPUT should be switched off whenever views such as v$sql, v$session
are queired. I don't really understand the link in terms of impact that one can have on the other or better to say rather, why there is an impact
Hi Dariyoosh,
SET SERVEROUTPUT ON has the effect of executing dbms_output.get_lines after each and every statement. Not only related to system view.
Here below what Tom Kyte is explaining in this page:
Now, sqlplus sees this functionality and says "hey, would not it be nice for me to dump this buffer to screen for the user?". So, they added the SQLPlus command "set serveroutput on" which does two things
1) it tells SQLPLUS you would like it <b>to execute dbms_output.get_lines after each and every statement</b>. You would like it to do this network rounding after each call. You would like this extra overhead to take place (think of an install script with hundreds/thousands of statements to be executed -- perhaps, just perhaps you don't want this extra call after every call)
2) SQLPLUS automatically calls the dbms_output API "enable" to turn on the buffering that happens in the package.Regards.
Al

Questions about the Apple Developer Enterprise Program

Hi there,
i got some questions about the Apple Developer Enterprise Program:
- is there a way a company can create their own "AppStore" with only the APPs the employees should use?
- when I developed the enterprise app are the install files on a apple hosted server or do i need my own infrastructure to distribute my app?
Thanks in advance for answers!

Google: MDM

Some questions about the integration between BIEE and EBS

Hi, dear,
I'm a new bie of BIEE. In these days, have a look about BIEE architecture and the BIEE components. In the next project, there are some work about BIEE development based on EBS application. I have some questions about the integration :
1) generally, is the BIEE database and application server decentralized with EBS database and application? Both BIEE 10g and 11g version can be integrated with EBS R12?
2) In BIEE administrator tool, the first step is to create physical tables. if the source appliation is EBS, is it still needed to create the physical tables?
3) if the physical tables creation is needed, how to complete the data transfer from the EBS source tables to BIEE physical tables? which ETL tool is prefer for most developers? warehouse builder or Oracle Data Integration?
4) During data transfer phase, if there are many many large volume data needs to transfer, how to keep the completeness? for example, it needs to transfer 1 million rows from source database to BIEE physical tables, when 50%is completed, the users try to open the BIEE report, can they see the new 50% data on the reports? is there some transaction control in ETL phase?
could anyone give some guide for me? I'm very appreciated if you can also give any other information.
Thanks in advance.

1) generally, is the BIEE database and application server decentralized with EBS database and application? Both BIEE 10g and 11g version can be integrated with EBS R12?You, shud consider OBI Application here which uses OBIEE as a reporting tool with different pre-built modules. Both 10g & 11g comes with different versions of BI apps which supports sources like Siebel CRM, EBS, Peoplesoft, JD Edwards etc..
2) In BIEE administrator tool, the first step is to create physical tables. if the source appliation is EBS, is it still needed to create the physical tables?Its independent of any soure. This is OBIEE modeling to create RPD with all the layers. If you build it from scratch then you will require to create all the layers else if BI Apps is used then you will get pre-built RPD along with other pre-built components.
3) if the physical tables creation is needed, how to complete the data transfer from the EBS source tables to BIEE physical tables? which ETL tool is prefer for most developers? warehouse builder or Oracle Data Integration?BI apps comes with pre-built ETL mapping to use with the tools majorly with Informatica. Only BI Apps 7.9.5.2 comes with ODI but oracle has plans to have only ODI for any further releases.
4) During data transfer phase, if there are many many large volume data needs to transfer, how to keep the completeness? for example, it needs to transfer 1 million rows from source database to BIEE physical tables, when 50%is completed, the users try to open the BIEE report, can they see the new 50% data on the reports? is there some transaction control in ETL phase?User will still see old data because its good to turn on Cache and purge it after every load.
Refer..http://www.oracle.com/us/solutions/ent-performance-bi/bi-applications-066544.html
and many more docs on google
Hope this helps

Two questions about the new iWeb

Hi
I've got two questions about the new iWeb.
1. Is it possible to blog online now? Meaning adding a new blog entry without having to be on your own Mac? This is a feature I've been waiting for since iWeb first was released.
2. Is it possible to choose the format of images? Earlier editions had the option to "optimize" images but that meant it changed it into .png meaning the site got a lot heavier than if .jpg was used. And since I have relatives who still only have an isdn connection I need to be able to have the website as light as possible.
thanks

Ah well... thanks for the quick answer
Message was edited by: Guðlogi

Question about the jsp:useBean tag

Similar Messages

Maybe you are looking for