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
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Jacob Meushaw wrote:
>
> This should be an easy question. I am trying to use an expression for a
> parameter to a jsp or custom jsp tag. When I hard code a value for the
> parameter, the tag works fine but when I use the expression, the expression
> gets evaluated but the tag itself does not resulting in the tag being shown
> in my output.
>
> For example:
>
> <jsp:forward page="www.slashdot.org"/> works
>
> <jsp:forward page="<%=request.getParameter("DESTINATION")%>"/>
> places the following into my html output
> <jsp:forward page="www.slashdot.org"/>
>
> Can someone please tell me what I am doing wrong or at least offer some
> debugging hints?
>
> Thanks in advance!
>
> --
> Jacob Meushaw
Jeff Smith
[email protected]
BEA Systems, Inc.
720-565-6613
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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() %>
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</html>However, up to now, I am only able to display the values on my JSP page using the scriptlet
<% CalendarParse sTime = new CalendarParse();
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<%=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;
FayyazThe code:
<jsp:useBean id="calendar" class="calendar.CalendarParse" scope="session"/>
<c:set var="time" value="${calendar.time}"/>Would be roughly equivalant to:
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<jsp:useBean id="sTime" class="salattimes.CalendarParse"/>
<c:set var="myTime" value="${sTime.time}" scope="session"/>
${myTime.a}
${myTime.b}
${myTime.c}
etc...Here is an explanation of the parts:
/* name of the variable */ /* fully qualified class name, package.className */
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/* name of the new object from bean */ /* source of object, variable.property */ /* Scope of new object */
<c:set var="myTime" value="${sTime.time}" scope="session"/>
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Hi,
i am chiranjit , i am in a jsp project . i am desparately looking a solution for below stated problem:
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Can anybody tell me why am i getting the error for the JavaBean.
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /SimpleBean.jsp(9,0) The value for the useBean class attribute com.stardeveloper.bean.test.SimpleBean is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1272)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1178)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2411)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2417)
org.apache.jasper.compiler.Node$Root.accept(Node.java:495)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)
org.apache.jasper.compiler.Generator.generate(Generator.java:3426)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:216)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:332)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:312)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:299)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:586)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.20 logs.
Apache Tomcat/6.0.20
my jsp file is in path c:\tomcat6\webapps\dev\SimpleBean.jsp
my JavaBean compiled class is in path
c:\tomcat6\webapps\dev\WEB-INF\classes\com\stardeveloper\bean\test\SimpleBean.class
and my SimpleBean java class declaration is
package com.stardeveloper.bean.test;
public class SimpleBean implements java.io.Serializable
and my jsp page SimpleBean.jsp pages call to useBean is as follows
<jsp:useBean id="simple" class="com.stardeveloper.bean.test.SimpleBean">
<jsp:setProperty name="simple" property="name" value="Sujoy" />
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Please help me anybody.First, try restarting Tomcat :-)
Main 3 reasons for "useBean class is invalid"
- class must be in a package (ok)
- class must be public, and have public constructor that takes no arguments (check)
- class must be compiled, valid and on the classpath. Normally this means the WEB-INF/classes directory.
From what you have told us, everything seems to check out.
Try recompiling the .class file to ensure it is valid.
Does your constructor do anything which might thrown an exception?
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<%@ page import="com.stardeveloper.bean.test.SimpleBean" %>
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when I use
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Exception Details: org.apache.jasper.JasperException
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You can see this here:
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I know, it is not that logical in the first moment, but it makes sense.
Regards
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PS: This space SAP Interactive Forms by Adobe is the correct for questions like that -
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That statement executes just fine, as the debug HTML statement that follows is printed using <c:out>.
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Hi, I'm a relative newcomer to jsp, but the following piece of javascript code has me very confused:
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http://www.sun.com/developers/support -
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