Jsp:useBean and definition of bean inside jsp:declaration

I use the following code where I define a bean in jsp:declaration
Its name is localBean. the problem is that jsp:useBean causes
a crash and my page is not working without understanding why.
When I replace the localBean in the jsp:useBean with another Bean
which is an actual class that resides in the system I have not a problem.
Any suggestions???
<HTML>
     <jsp:declaration>
          static public class localBean {
               private String value;
               public String getValue() {
                    return value;
               public void setValue(String value) {
                    this.value = value;
     </jsp:declaration>
     <jsp:useBean id="localBean" scope="page" class="localBean">
          <jsp:setProperty name="localBean" property="value" value="World"/>
     </jsp:useBean>
     <%-- Whatever HTTP parameters we have, try to set
          an analogous bean property -- %>
     <jsp:setProperty name="localBean" property="*"/>
     <head>
          <title>Hello World JavaBean</title>
     </head>
     <body>
          <center>
               <p><h1>
                    Hello
                    <jsp:getProperty name="localBean" property="value"/>
               </h1></p>
               <form method="post">
                    Enter a name to be greeted:
                    <input type="text" size="32" name="value"
                    value="<jsp:getProperty name='localBean' property='value'/>">
                    <br>
                    <input type="submit" value="submit"/>
               </form>
          </center>
     </body>
</html>

Thanks,
I have added scope="application". It still show "null" indicating that the bean is not initialized with the properties. I would like a quicker way to initialize a bean property than invoking the setProperty tag for each property.
Here is a simple example that demonstrates the problem:
<%@ page language="java" %>
<%@ page import="com.tests.*" %>
<jsp:useBean id="monBean" class="com.tests.MonBean" scope="application"/>
<%
MonBean mb = new MonBean();
mb.setName("toto");
monBean= mb;
%>
<html>
<head>
<title>Lomboz JSP</title>
</head>
<body bgcolor="#FFFFFF">
<jsp:getProperty name="monBean" property="name"/>
</body>
</html>And the bean
package com.tests;
public class MonBean {
private String name;
public String getName() {
return name;
public void setName(String name) {
this.name = name;
}This show "null".
Any other idea why this is not working?
Thanks,
Julien

Similar Messages

Jsp:useBean and assigning a value to that bean

Hello,
I have a type called Country and I have declared a bean using the "jsp:useBean" syntax.
I then try to assign a value to that bean in a scriptlet. Eventually I try to retrieve the values using "jsp:getProperty". The problem is that it appears to null.
Here is the code of the jsp
<%@ page language="java" %>
<%@ page import="com.parispano.latinamericaguide.*" %>
<%
/* We retrieve the Countries object from the servlet context. */
ServletContext sc = getServletContext();
Countries cs = (Countries)sc.getAttribute("countries");
%>
<jsp:useBean id="country" class="com.parispano.latinamericaguide.Country"/>
<%
/* If the request contains a country id, then we set the variable. */
country = cs.getCountryFromId(Integer.parseInt(request.getParameter("countryID")));
%>
<html>
<head>
<title>Country details</title>
</head>
<body>
<table>
<tr><td>Name</td><td><jsp:getProperty name="country" property="name"/></td></tr>
<table>
<%
out.println(country.getName());//This is working
%>
</body>
</html>This is the code for the bean
package com.parispano.latinamericaguide;
* @author Julien Martin
* Represents a country.
public class Country implements Comparable {
     private int id;
     private String name;
     private int landArea;
     private String capital;
     private String currency;
     private String flag;
     private String internet_domain;
     private String dialling_code;
     private float literacy;
     private float male_life_expectancy;
     private float female_life_expectancy;
     private String map;
     private int population;
     private int population_year;
     private float birth_rate;
     private int birth_rate_year;
     private float death_rate;
     private int death_rate_year;
     private int gdp;
     private int gdp_per_head;
     private int gdp_year;
     private float unemployment_rate;
     private int unemployment_rate_year;
     public Country() {
     public Country(
          int id,
          String name,
          int landArea,
          String capital,
          String currency,
          String flag,
          String internet_domain,
          String dialling_code,
          float literacy,
          float male_life_expectancy,
          float female_life_expectancy,
          String map,
          int population,
          int population_year,
          float birth_rate,
          int birth_rate_year,
          float death_rate,
          int death_year_rate,
          int gdp,
          int gdp_year,
          float unemployment_rate,
          int unemployment_rate_year) {
          this.id = id;
          this.name = name;
          this.landArea = landArea;
          this.capital = capital;
          this.currency = currency;
          this.flag = flag;
          this.internet_domain = internet_domain;
          this.dialling_code = dialling_code;
          this.literacy = literacy;
          this.male_life_expectancy = male_life_expectancy;
          this.female_life_expectancy = female_life_expectancy;
          this.map = map;
          this.population = population;
          this.population_year = population_year;
          this.birth_rate = birth_rate;
          this.birth_rate_year = birth_rate_year;
          this.death_rate = death_rate;
          this.death_rate_year = death_year_rate;
          this.gdp = gdp;
          this.gdp_year = gdp_year;
          this.unemployment_rate = unemployment_rate;
          this.unemployment_rate_year = unemployment_rate_year;
     public float getBirth_rate() {
          return birth_rate;
     public int getBirth_rate_year() {
          return birth_rate_year;
     public String getCapital() {
          return capital;
     public String getCurrency() {
          return currency;
     public float getDeath_rate() {
          return death_rate;
     public int getDeath_rate_year() {
          return death_rate_year;
     public String getDialling_code() {
          return dialling_code;
     public float getFemale_life_expectancy() {
          return female_life_expectancy;
     public String getFlag() {
          return flag;
     public int getGdp() {
          return gdp;
     public int getGdp_per_head() {
          return gdp / population;
     public int getGdp_year() {
          return gdp_year;
     public int getId() {
          return id;
     public String getInternet_domain() {
          return internet_domain;
     public float getLiteracy() {
          return literacy;
     public float getMale_life_expectancy() {
          return male_life_expectancy;
     public String getMap() {
          return map;
     public String getName() {
          return name;
     public int getPopulation() {
          return population;
     public int getPopulation_year() {
          return population_year;
     public int getLandArea() {
          return landArea;
     public float getUnemployment_rate() {
          return unemployment_rate;
     public int getUnemployment_rate_year() {
          return unemployment_rate_year;
     public void setBirth_rate(float f) {
          birth_rate = f;
     public void setBirth_rate_year(int i) {
          birth_rate_year = i;
     public void setCapital(String string) {
          capital = string;
     public void setCurrency(String string) {
          currency = string;
     public void setDeath_rate(float f) {
          death_rate = f;
     public void setDeath_rate_year(int i) {
          death_rate_year = i;
     public void setDialling_code(String string) {
          dialling_code = string;
     public void setFemale_life_expectancy(float f) {
          female_life_expectancy = f;
     public void setFlag(String string) {
          flag = string;
     public void setGdp(int i) {
          gdp = i;
     public void setGdp_per_head(int i) {
          gdp_per_head = gdp/population;
     public void setGdp_year(int i) {
          gdp_year = i;
     public void setId(int i) {
          id = i;
     public void setInternet_domain(String string) {
          internet_domain = string;
     public void setLiteracy(float f) {
          literacy = f;
     public void setMale_life_expectancy(float f) {
          male_life_expectancy = f;
     public void setMap(String string) {
          map = string;
     public void setName(String string) {
          name = string;
     public void setPopulation(int i) {
          population = i;
     public void setPopulation_year(int i) {
          population_year = i;
     public void setlandArea(int i) {
          landArea = i;
     public void setUnemployement_rate(float f) {
          unemployment_rate = f;
     public void setUnemployment_rate_year(int i) {
          unemployment_rate_year = i;
     public String toString() {
          return name;
     public int compareTo(Object o) {
          Country c = (Country)o;
          int cmp = name.compareTo(c.name);
          System.out.println(cmp);
          return cmp;
}Can anyone please help?
Thanks in advance,
Julien.

Thanks,
I have added scope="application". It still show "null" indicating that the bean is not initialized with the properties. I would like a quicker way to initialize a bean property than invoking the setProperty tag for each property.
Here is a simple example that demonstrates the problem:
<%@ page language="java" %>
<%@ page import="com.tests.*" %>
<jsp:useBean id="monBean" class="com.tests.MonBean" scope="application"/>
<%
MonBean mb = new MonBean();
mb.setName("toto");
monBean= mb;
%>
<html>
<head>
<title>Lomboz JSP</title>
</head>
<body bgcolor="#FFFFFF">
<jsp:getProperty name="monBean" property="name"/>
</body>
</html>And the bean
package com.tests;
public class MonBean {
private String name;
public String getName() {
     return name;
public void setName(String name) {
     this.name = name;
}This show "null".
Any other idea why this is not working?
Thanks,
Julien

Jsp:useBean and Tomcat

Hi!
I have installed Tomcat as localhost and succeed in running scriplets. But now I want to try using jsp:useBean
I have compiled a simple class, test1.class and placed it under webapps/root together with the jsp-file.
When I use �
<jsp:useBean id="test1" scope="page" class="test1"/>
to start test1, Tomcat tries to find it in org.apache.jsp
Then I tried to add - package myFolder; - in test1 but it won�t work.
So! These are my questions.
Is it possible for Tomcat to find a class placed in the webapps/root folder?
Where can I find org/apache/jsp, is it in a .jar-file somewhere? I can�t fint it when I use - search files/folders.
Where should I place test1.class and how do I write the useBean-tag to make it work?
Thanks for any answer
Regards Peter

your beans should always be under /web-inf/classes
so if you want to put it in the root directory it should look like this
tomcat-path/webapps/root/web-inf/classes
in your jsp file, don't forget to import the bean i.e
<%@ page import="package_name.mybeans.*" %>
then use the jsb:useBean the way you did
<jsp:useBean id="test1" class="test1" scope="page" />
it should then work fine,
regards

Is there any difference between "jsp:useBean" and "scriptlet" ?

A few days ago, I asked similar question. But I didn't get the answer I wanted.
I want to know the differnce between <jsp:useBean../> and <% .. %>(scriptlet).
I tested in three environments(Oracle Jserv, OC4J, and Apache Tomcat).
In Oracle Jserv and OC4J, a problem occured. But, Apache Tomcat does not occur a problem.
For example,
1) TestClass.java (Bean)
public class TestClass {
private String txt;
public class TestClass {
txt = "Test"; ----- (g
public String getTxt() {
return txt;
2) test.jsp
<html><body>
<% TestClass test = new TestClass(); %> ---(h
<%= test.getTxt() %>
</body></html>
Assume that I visit "http://localhost:8888/test.jsp".
In Tomcat, if I change "Test"(number(g) to "Test1" and compile the browser shows the change.
But Oracle Jserv and OC4J does not do that. They also show the old String.
So, I changed <% TestClass test = new TestClass(); %>(number(h) to <jsp:useBean id="test" class="TestClass" />. That is, I changed "Scriptlet" to "JSP useBean Tag".
Then, Oracle Jserv and OC4J also show the changes.
To conclude, is there any difference between "JSP useBean Tag" and "Scriptlet"?
Can't I use a scriptlet (to make a class) in Oracle Servlet Engine?
Thanks.

It could be as simple as the JSP not recompiling between java recompiles - ie, it compiles in the link to the old class.
Try changing the JSP file (add and delete a space) after you change the java code, and then see what happens.
Jonny
null

JSP useBean and Tomcat NoClassDefFoundError

Hi,
I have a webapp on tomcat whose structure is like this
/tomcat
--/webapps
----/mywebappname
------/WEB-INF
--------/classes
----------MyBean.java
When I use useBean class="MyBean" I get a NoClassDefFoundError for this particular class.
I suspect this is some kind of classpath issue but do not know how to fix it. Help appreciated.

place u'r class file in <tomcat-root>/classes folder.
if there's no such folder ,u'll have to create it.

Adf-Struts/JSP/BC4J- and setting date fields from jsp

Hi,
I'm working with the new ADF Frameworks (JDev 9.0.5.1) and ran into some questions regarding exception handling using BC4J, Struts and JSPs.
I have a DATE column in database and an entity and VO with a datefield with type oracle.jbo.domain.Date.
My JSP shows a textfield and the user should enter a valid date. Everything fine, until date is of wrong format or contains illegal characters...
Problem:
ADF tries to do a setAttribute on the datefield in VO row which expects a parameter with type oracle.jbo.domain.Date. When the user entered e.g. "NiceWeather" as date, I get an IIlegalArgumentException while converting to the correct Date format. This exception isn't thrown by bc4j as AttrValException and therefore my JSP renders a global error instead of a message directly behind the date field.
I tried to validate the datefield in my DataForm and in my Action in the validateModelUpdates() method, but with no fitting solution.
Any ideas how to validate a datefield with adf/struts/jsp/bc4j?
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Torsen - In the first instance I'd recommed that you try and handle it declaritively using the Struts Validator Framework . See http://otn.oracle.com/products/jdev/howtos/10g/StrutsValidator/struts_validator_howto.html
There is a section in there on how to use the validator with ADF databound pages and you can check the format the user enters via generated JavaScript.
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Hi,
I'm new to JSP, I've installed Tomcat 5.0.28 and I'm able to run JSP but when I try an asp wich uses a bean it gives me this error, the directory structure is
testingProject with the first.jsp
testingProject\WEB-INF\classes\myPackage with the test.class
the first.asp
<%@ page import="myPackage.Test" %>
<html><head><title>Test</title></head>
<body bgcolor=white>
<jsp:useBean id="list" class="myPackage.Test"> </jsp:useBean>
<jsp:getProperty name="list" property="value1" />
<%=list.value1%>
<p>
</body></html>
the Test.java
package myPackage;
public class Test{
String value1="testinggggggggg";
public void Test(){
public String getValue1(){ return value1}
the error
thanks in advance
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 6 in the jsp file: /first.jsp
Generated servlet error:
C:\Program Files\Apache Group\Tomcat 5.0\work\Catalina\localhost\testingProject\org\apache\jsp\first_jsp.java:60: cannot resolve symbol
symbol : variable value1
location: class myPackage.Test
out.print(list.value1);
^
1 error
     org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
     org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:332)
     org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:412)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)

There are two ways of getting info from the bean.
1) the jsp:getProperty tag, which seems correct in your code
2) the <%= ... tag. In that case you must write a valid java expression. In your case: list.getValue1()

Jsp:useBean

I really shouldn't be trying to use JSP any more ...
I have been having problems using JavaBeans in JSP pages now - every time a problem is solved, that other little thing that always wanted a go at annoying me arrives ...
The code is:
<jsp:useBean id="pollResult" scope="application" class="com.ora.jsp.beans.poll.PollBean" />Because another JSP page I created (using JavaBeans) worked, using a JavaBean from the directory com.ora.jsp.beans.userinfo.UserInfoBean, I assumed that THIS would work - but it didn't! The error was:
org.apache.jasper.JasperException: /calculate.jsp(11,2) According to TLD or attribute directive in tag file, attribute test does not accept any expressionsAnother problem, is there a solution?
Sincerely, I'm sorry to plague everyone out there with all my problems - maybe I should give up and become a potato farmer instead ...

Hi
My Calculate.jsp looks like this:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<jsp:useBean id="pollResult" scope="application"
class="com.ora.jsp.beans.poll.PollBean" />
<jsp:useBean id="answer" class="com.ora.jsp.beans.poll.AnswerBean" >
<jsp:setProperty name="answer" property="*" />
</jsp:useBean>
<c:choose>
<c:when test="${answer.valid}" >
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    <jsp:forward page="result.jsp" />
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</c:otherwise>
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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 ?

jsp:useBean class=" expression " .......

I need to put the class value of the <jsp:useBean> and take it from a java class on the server.
I use a method with this signature:
public String getClassname(...){
return newclass.toString();
and put it in the jsp element like:
<jsp:useBean id="bean1" scope="session" class="<%=utility.getClassName()%>" />
It does not work while had never problems with a forward element instead like this:
<jsp:forward page="<%=util.getPage()%>" />
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best regards
Joan

thanks gray man.
the
beanName="=<% classfactory.getHandler()%>"
inserted in a usebean tag compiles
but when i call a
<jsp:setProperty name="bean" property="*"/>
on this bean I find that all the values are set empty
like if it is the parent class that gets called and not
the real subclass that I am casting to with the dynamic
beanName="=<% classfactory.getHandler()%>" .
Not found a solution yet wether casting to an interface
or to a superclass.

jsp:useBean /jsp:useBean

Hi,
I am really sorry for the inconvenience.I wrongly mentioned name in place of id vice versa.
I am trying to use the beans within the JSP page by sending its input to other class which i used it in Bean.The tags and contents listed are as follows:
<jsp:useBean id="register1" class="/rms/reigister">
<jsp:setProperty name="register1" property="*"/>
</jsp:useBean>
On executing it i get the error as the class attribute /rms/register is invalid.
<jsp:useBean name="register1" class="org.apache.catalina.rms.reigister">
<jsp:setProperty id="register1" property="*"/>
</jsp:useBean>
On executing it i get the error as the class attribute "org.apache.Catalina.rms.register" is invalid.
Thanks in advance

Hi,
I am really sorry for the inconvenience.I wrongly mentioned name in place od id vice versa.
I am trying to use the beans within the JSP page by sending its input to other class which i used it in Bean.The tags and contents listed are as follows:
<jsp:useBean id="register1" class="/rms/reigister">
<jsp:setProperty name="register1" property="*"/>
</jsp:useBean>
On executing it i get the error as the class attribute /rms/register is invalid.
<jsp:useBean name="register1" class="org.apache.catalina.rms.reigister">
<jsp:setProperty id="register1" property="*"/>
</jsp:useBean>
On executing it i get the error as the class attribute "org.apache.Catalina.rms.register" is invalid.
Thanks in advance

How to assign the class value dynamically in jsp:useBean ?its urgent

Hi
I want to set the class value of <jsp:useBean> dynamically
when i am trying to this way
<jsp:useBean id="<%=id %>" class="<%=beanclass %>" scope="request">
<jsp:setProperty name="<%=id %>" property="*"/>
</jsp:useBean>
where beanclass is .class file that is to be used by the usebean tag
i am getting following error
The value for the useBean class attribute <%=beanclass %> is invalid.
please help as soon as possible
regards,
Rameshwari

You can not do that.The jsp:useBean and jsp:setProperty are action tags and not custom tags. Action tags get translated into Java code in the translation unit and are then compiled. Custom tag are backed by classes and the tag get translated into a method call of the class.

Jsp:useBean giving error while compiling JSP's in JDeveloper

Hello,
I am having another problem with JSP's in JDeveloper 10.1.3. jsp:useBean and jsp:setProperty are all giving problems. I am not sure what I need to do to get rid of this error
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Your original post mentions issues with jsp:useBean and jsp:setProperty, now you're talking about tag libraries and directives. Can you be more specific about what you're trying to do? Are you having problems getting JDev to recognize a tag library or are you having problems with the tag library when running the app? What directive are you trying to use that causes the termination error?

Use classes in JSP without jsp:useBean

hi
i want to instantiate my own classes within a jsp.
the classes are in web-inf/classes/chat/
there is one main class which is used all over the app, so i use it with the jsp:useBean and scope on application.
The messages are saved in objects of the class Message. now i want to use this class in my JSP without useBean.
Is this possible without extra setting the classpath?!
I get the error because the interpreter searchs in a package from tomcat itself..
Thanks a lot and rgds
Ruven

I think you can use any class in your jsp file without the <jsp:useBean>, this implies that you have to declare your class in the ordinary way i.e
<% MyClass c = new MyClass() ;
//other code
%>
the important thing is to use the page directive's import attribute i.e include this line in your jsp page
<%@ page import="mypackage.inner.MyClass" %> the web containers when sees this line will assume that you have the following directory structure in your web application ( /mywebapps/web-inf/classes/mypackage.inner/* )
I hope this helps
Regards

Jsp:plugin and codebase

I have a JSP with the following jsp:plugin code:
<jsp:plugin type="applet"
code="com.package.Applet.class"
codebase="/application1/applets/" width="50"
height="50">
</jsp:plugin>
Web applications, which run this applet, specify different codebase, such as /application2/applets/,
/application3/applets/ and so on.
Unfortunatelly JSP specification doesn't allow dynamic codebase in jsp:plugin and we create a new JSP for
each new web domain to specify another hardcoded codebase attribute.
Could you please advice a trick to generate codebase attribute at run-time, to deploy the same JSP in all
applications.
Evgeny Gesin
Javadesk

Well, then I would just put in the object/embed tags yourself. You can get whatever the plugin tag writes by just using the tag once with static values and view the source in the browser and copy it out, then replace whatever values with scriptlets (or other taglib tags) to fill in the correct values.

Jsp:useBean and definition of bean inside jsp:declaration

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