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

Similar Messages

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().

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 ?

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

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 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...

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.

Using variables in a jsp:useBean tag

I was wondeing if it is possible in any way to use variables in a jsp:useBean tag. Here is an example of what I am trying to do.
<%
String beanType = request.getParameter( "bean" );
if( beanType.equals( "Bean1" ) ) {
beanClass = "com.myCompany.Bean1";
} else {
beanClass = "com.myCompany.Bean2";
%>
<jsp:useBean name="<%= beanType %>" class="<%= beanClass %>"/>
I also tried using this approach
<%
if( beanType.equals( "Bean1" ) ) {
%>
<jsp:useBean id="bean" class="com.myCompany.Bean1"/>
<%
} else if( beanType.equals( "Bean2" ) ) {
%>
<jsp:useBean id="bean" class="com.myCompany.Bean2"/>
<%
%>
Neither approach seems to work. Is there any way around this problem?
Thanks,
Marcus.

Hi,
check:
http://forum.java.sun.com/thread.jsp?forum=45&thread=398998&tstart=75&trange=15

RE: Strange behavior with initialization in jsp:useBean tags? (wl 5.1 sp6/8 on sol 8)

Hello,
          I am trying to initialize a session scope bean using the <jsp:useBean ..>
          Init Code </jsp:useBean>
          syntax. This works fine for the initial page load -- the information in the
          bean
          is there and everything looks fine. However, when I do a reload of the page,
          then all of the information on the bean disappears. The setter methods of
          the
          bean are not getting invoked, nor are the beans constructers.
          However, one thing that I do notice is that after I modify the page, then
          in the WL output I see constructors called for the beans that I am using,
          then I see the compilation directive for the changed JSP. It almost looks
          like WL is creating some beans with the default constructors, then
          when my page loads, it creates some other beans using the initialization
          code.
          After a reload, it then stops using the beans that have been initialized and
          then uses those that have been created with the normal default constructors.
          This is on WL5.1 sp6 on Solaris 8. I also tried with sp8 but there
          was no difference in behavior.
          If anyone has any pointers I would appreciate it. I had thought that 5.1
          was up to the 1.1 JSP spec, but maybe I was mistaken. FWIW,
          here is the init code I am using:
          <jsp:useBean id="myFoo" scope="session" class="com.foo">
          FooDAO dao = new FooDAO();
          ArrayList listOfFoos = dao.getAllFoos(1);
          myFoo = (Foo) listOfFoos.get(0));
          </jsp:useBean>
          This snippet is being statically included with a <%@ include file %>
          by the page that I am invoking.
          Regards,
          Nathan
          [email protected]


.... add the session binding interface to assist in your debugging. Post
          your results. It sounds like you are losing the session, but who knows ...
          Peace,
          Cameron Purdy
          Tangosol, Inc.
          http://www.tangosol.com
          +1.617.623.5782
          WebLogic Consulting Available
          "Nathan Cuka" <[email protected]> wrote in message
          news:[email protected]...
          > Hello,
          >
          > I am trying to initialize a session scope bean using the <jsp:useBean ..>
          > Init Code </jsp:useBean>
          > syntax. This works fine for the initial page load -- the information in
          the
          > bean
          > is there and everything looks fine. However, when I do a reload of the
          page,
          > then all of the information on the bean disappears. The setter methods of
          > the
          > bean are not getting invoked, nor are the beans constructers.
          >
          > However, one thing that I do notice is that after I modify the page, then
          > in the WL output I see constructors called for the beans that I am using,
          > then I see the compilation directive for the changed JSP. It almost looks
          > like WL is creating some beans with the default constructors, then
          > when my page loads, it creates some other beans using the initialization
          > code.
          > After a reload, it then stops using the beans that have been initialized
          and
          > then uses those that have been created with the normal default
          constructors.
          >
          > This is on WL5.1 sp6 on Solaris 8. I also tried with sp8 but there
          > was no difference in behavior.
          >
          > If anyone has any pointers I would appreciate it. I had thought that 5.1
          > was up to the 1.1 JSP spec, but maybe I was mistaken. FWIW,
          > here is the init code I am using:
          >
          > <jsp:useBean id="myFoo" scope="session" class="com.foo">
          > FooDAO dao = new FooDAO();
          > ArrayList listOfFoos = dao.getAllFoos(1);
          > myFoo = (Foo) listOfFoos.get(0));
          > </jsp:useBean>
          >
          > This snippet is being statically included with a <%@ include file %>
          > by the page that I am invoking.
          >
          > Regards,
          >
          > Nathan
          > [email protected]
          >
          >

Is the jsp:plugin tag supported in Weblogic 5.1?

I am running Weblogic 5.1 and I can't get the <jsp:pluging> tag to work.
          The server is not even translating the tag to anything usefull. When I do a
          'View Source' in the browser, the tag is exactly as I wrote it in the page.
          Is this feature supported in 5.1. I've tried the phonebook example and it
          doesn't work either. All my other JSP pages work just fine.
          Any help would be appreciated...
          Steven Carter
          Senior Software Developer
          VideoSpheres Inc.
          Office: 613-270-9646 Ext. 3025
          FAX: 613-271-9442
          e-mail:[email protected]


Thanks for your response! Yes it was a typo in the message :). Would you have any idea why it is not working for me? Any special configuration required? A property I don't have correctly set in the properties file? I've tried the phonebook example shipped with the product and it doesn't work.
          "Kumar Allamraju" <[email protected]> wrote in message news:[email protected]..
          I never tested it myself. But i think we do support
          in 5.1 . Shouldn't it be <jsp:plugin>
          Was it a typo?
          Steven Carter wrote:
          I am running Weblogic 5.1 and I can't get the <jsp:pluging> tag to work.
          The server is not even translating the tag to anything usefull. When I do a
          'View Source' in the browser, the tag is exactly as I wrote it in the page.
          Is this feature supported in 5.1. I've tried the phonebook example and it
          doesn't work either. All my other JSP pages work just fine.
          Any help would be appreciated...
          Steven Carter
          Senior Software Developer
          VideoSpheres Inc.
          Office: 613-270-9646 Ext. 3025
          FAX: 613-271-9442
          e-mail:[email protected]
          [att1.html]

JSP - useBean tag works only for first request

hey why donnu change the scope to PAGE, give a try.........
          Vishal Vishnoi wrote:
          > Using Weblogic 5.1 I am trying to work with a simple example of a JSP
          > page which has got a usebean tag. The tag is
          >
          > <jsp:useBean id="resourceTypes" type="java.util.ArrayList"
          > scope="request" />
          >
          > * This works only the first time I load the page.
          >
          > If I try to load the page again. I get the following error
          >
          > javax.servlet.ServletException: Could not find bean 'resourceTypes',
          > type 'java.
          > util.ArrayList' in scope
          >
          > --Vishal

Is the jsp forward tag fails in iplanet application server sp2?

11/Feb/2002 17:55:41:2] error: Exception: SERVLET-compile_failed: Failed in compiling template: /EinsWebTool/QueryScreen.jsp, Parse error in JSP parser. Missing endtag: /jsp:forward
Exception Stack Trace:
java.lang.Exception: Parse error in JSP parser. Missing endtag: /jsp:forward
at java.lang.Throwable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Compiled Code)
at java.lang.Throwable.<init>(Compiled Code)
at java.lang.Exception.<init>(Compiled Code)
at com.netscape.jsp.JSP.parseBlock(Compiled Code)
at com.netscape.jsp.JSP.parseReqDisp(Unknown Source)
at com.netscape.jsp.JSP.parseTag(Compiled Code)
at com.netscape.jsp.JSP.parseNext(Compiled Code)
at com.netscape.jsp.JSP.parseBlock(Compiled Code)
at com.netscape.jsp.JSP.parse(Unknown Source)
at com.netscape.jsp.JSP.compile(Unknown Source)
at com.netscape.server.servlet.jsp.JSPCompiler.JSPtoJava(Unknown Source)
at com.netscape.server.servlet.jsp.JSPCompiler.compileJSP(Compiled Code)
at com.netscape.server.servlet.jsp.JSPCompiler.compileOrLoadJSP(Unknown Source)
at com.netscape.server.servlet.jsp.JSPCompiler.compileInstance(Unknown Source)
at com.netscape.server.servlet.jsp.JSPCompiler.compileInstance(Unknown Source)
at com.netscape.server.servlet.platformhttp.PlatformHttpServletResponse.callJspCompiler(Unknown Source)
at com.netscape.server.servlet.platformhttp.PlatformHttpServletResponse.callUri(Unknown Source)
at com.netscape.server.servlet.platformhttp.PlatformHttpServletResponse.callUriRestrictOutput(Unknown Source)
at com.netscape.server.servlet.platformhttp.PlatformRequestDispatcher.forward(Unknown Source)
at com.netscape.jsp.PageContextImpl.forward(Unknown Source)
at jsp.APPS.EinsWebTool.Login._jspService(Compiled Code)
at jsp.APPS.EinsWebTool.Login.service(Login.java:42)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at com.netscape.server.servlet.servletrunner.ServletInfo.service(Unknown Source)
at com.netscape.server.servlet.servletrunner.ServletRunner.callJSP(Unknown Source)
at com.netscape.server.servlet.platformhttp.PlatformHttpServletResponse.callJspCompiler(Unknown Source)
at com.netscape.server.servlet.platformhttp.PlatformHttpServletResponse.callUri(Unknown Source)
at com.netscape.server.servlet.platformhttp.PlatformHttpServletResponse.callUriRestrictOutput(Unknown Source)
at com.netscape.server.servlet.platformhttp.PlatformRequestDispatcher.forward(Unknown Source)
at com.netscape.server.servlet.jsp.JSPRunner.service(Unknown Source)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at com.netscape.server.servlet.servletrunner.ServletInfo.service(Unknown Source)
at com.netscape.server.servlet.servletrunner.ServletRunner.execute(Unknown Source)
at com.kivasoft.applogic.AppLogic.execute(Compiled Code)
at com.kivasoft.applogic.AppLogic.execute(Compiled Code)
at com.kivasoft.thread.ThreadBasic.run(Native Method)
at com.kivasoft.thread.ThreadBasic.run(Native Method)
at com.kivasoft.thread.ThreadBasic.run(Native Method)
at com.kivasoft.thread.ThreadBasic.run(Native Method)
at com.kivasoft.thread.ThreadBasic.run(Compiled Code)
at java.lang.Thread.run(Compiled Code)

Hi,
Yes, I was able to code this sucessfully and got it working. Here is the code I used...
<%
String fortune = (String) request.getAttribute("fortune_string");
%>
<HTML>
<HEAD><TITLE>Fortune Sample Application</TITLE></HEAD>
<BODY BGCOLOR=#FFFFFF>
<H2>The Oracular Servlet greets you!</H2>
<p>
Your fortune is...
<%= fortune%>
<p>
<p>
<hr size=0>
<p>
<FONT SIZE=2>Sample Applications
<jsp:forward page="/ias-samples/index.html">
</jsp:forward>
</BODY>
</HTML>
and I got it working. I believe the code is missing some tag, which I tried, but got error in KJS like...
[15/Feb/2002 11:23:49:7] info: --------------------------------------
[15/Feb/2002 11:23:49:7] info: jsp.APPS.fortune.fortune: init
[15/Feb/2002 11:23:49:7] info: --------------------------------------
Null text data??
2002-02-15 11:24:16 - error-the file '\fortune.jsp' generated the following pars
e exception: org.apache.jasper.compiler.ParseException: C:\iplanet\ias6\ias\APPS
\fortune\fortune\fortune.jsp(17,0) Expected "param" tag with "name" and "value"
attributes after the "params" tag.
In your case, I suspect, either the parser is not able to convert the .jsp file appropriately, or some inappropriate tag. If this doesn't help please send me your code & I can help you on this regard.
Regards
Raj
[email protected]

Problem with flush=true in the jsp:include tag

Hello
I have deployed a JSP based application , based on the apache struts framework. The web server is Sun One Webserver 6 Service Pack4, on a windows 2000 machine
The same application was tried on SunONE application server 7, and it works without any problem. However in this case the following error , on the page
javax:servlet.jspexception:Illegal to flush within a custom tag
Does this mean flush="true" is not allowed within custom tags
Or is there a workaround for this
Any help is appreciated
thanks
- Aniruddha

Hi,
This is a known problem, ��flush before you include�� limitation in JSP 1.1.
As a result, you have to state flush="true" every time you include a jsp using <jsp:include> tag if you are using JSP1.1.
Fortunately, it is fixed in JSP1.2. The flush attribute controls flushing. If true, then, if the page output is buffered and the flush attribute is given a ��true�� value, then the buffer is flushed prior to the inclusion, otherwise the buffer is not flushed. The default value for the flush attribute is ��false��.
Gary Wang
Developer Technical Support
SUN Microsystems
http://www.sun.com/developers/support/

Flush in the jsp:include tag

should I state flush="true" every time I include a jsp using <jsp:include> tag in a jsp pages? For example I am trying to include a menu bar on the top of every jsp pages. Should I flush the buffer every time? if not, will it affect the performance?
Thank you
Cal

Hi,
This is a known problem, ��flush before you include�� limitation in JSP 1.1.
As a result, you have to state flush="true" every time you include a jsp using <jsp:include> tag if you are using JSP1.1.
Fortunately, it is fixed in JSP1.2. The flush attribute controls flushing. If true, then, if the page output is buffered and the flush attribute is given a ��true�� value, then the buffer is flushed prior to the inclusion, otherwise the buffer is not flushed. The default value for the flush attribute is ��false��.
Gary Wang
Developer Technical Support
SUN Microsystems
http://www.sun.com/developers/support/

New to Jdev: having problem with Helloworld class and the jsp

Please, i went through the beginner's tour at oracle site and it has been interesting.
After putting the class name as Hello, the package name as "mypackage1" as in the example, then the extend field as java.lang.object There is always an error saying that "java.lang.object is not a valid base class for this option". Please what can i do, cos it's delaying my practise.
secondly, practising the jsp stuff is also interesting, but it's not showing the web preview. i mean after designing the stuff myself, it's giving some compilation error.
What can I do.
Thanks

Hello,
1- Are you running the "Building Your First Program with JDeveloper 10g" located at
http://www.oracle.com/technology/obe/obe9051jdev/FirstStep/FirstStep.htm
If not, is it working for you ?
2- Which exact version of JDeveloper are you running ? (Help -> About)
You should be running JDeveloper 10.1.2.x.x
You can get Oracle JDeveloper 10g (Version 10.1.2.1, build 1913) at
http://www.oracle.com/technology/software/products/jdev/index.html
look for the chapter "Oracle JDeveloper 10g Production".
3- Try re-installing JDeveloper (uncompressing the zip file) into a different
path (ex: C:\JDeveloper10g) and retry the first steps.
I've retested the "First Steps" against my Windows XP SP2 and it works just fine.
Regards,
Steff

Type="Class" in the jsp:useBean tag

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