How to set an object in request scope in a jsp uysing jstl

I usally use scriptlet in jsp to set an object in request is
there a way to do this using jstl
instead of this
<%request.setAttribute("test",myObject);%> I want to use tag ?

The <c:set> tag should be useful...
Of course if you can access it as a JSTL variable it IS already an attribute in scope.

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I write a class JavaScriptHelper to convert the object value to variable of the JavaScript;
1.get the data to a javabean from database;
2.convert the data to variable of the JavaScript as a String ;
3.store the object in a HttpSession or Httprequest ;
4.use in Jsp get the String (variable of the JavaScript )
YourBean bean = (YourBean) request.getAttribute("model");
if (bean != null) out.println(bean .getJsCode())
convert function,(this is only for the matrix):
public static String formatJsCode(Vector vector) {
String sJsCode = "";
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sJsCode += "var data=new Array();\n";
Vector v = null;
String sTemp = "", sLine = "";
for (int i = 0; i < vector.size(); i++) {
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sLine = "";
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sTemp = sTemp.replaceAll("\"", "\\\\\\\"");
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sJsCode += "data[" + i + "]=new Array(" + sLine + ");\n";
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How to set a Object value by JDI

How to set a Object value using JDI?
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class User{
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private String id;
set and get method;
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 break;
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 System.out.println("JDI error");
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 vmMachine = sac.attach(arguments);
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I will connect to server and monitor the remote server JVM , There is a object of User, I want to change its value by the Java Debugger Interface by client.
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I know the basic type filed value changed as follows:
Value newValue = vmMachine.mirrorOf("change var value");// this field is a string.
stackFrame.thisObject().setValue(field, newValue);
But a Object , how can I change its value.
Thanks Advanced.

ObjectReference.setValue() is the method for chaining the value of an Object's field. First you need to find the specific Object you want to change, though.
/Staffan

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I have two web applications. The "app1" is the one we are developing and retrieving the Principal object. The "app2" is a black box web application which we have no way to modify. We can only add parameters in web.xml. The business flow is that once the Principal object is retrieved in "app1", the "app1" calls "app2". The "app2" is looking for User_Principal object. The document says "USER_PRINCIPAL = (The user name is retrieved from a call to getUserPrincipal().getName() on the HttpServletRequest object for the current request in a servlet or JSP)". If I understand this correctly, the "app2" is going to look for "HttpServletRequest". How can the "app1" set Principal object so that "app2" can retrieve it from "HttpServletRequest"? As far as I know there is not "setUserPrincipal()" method in "HttpServletRequest". So the app1 cannot use "HttpServletRequest".
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Storing Objects in Request Scope

Hello,
I'm trying to pass an object in the request scope between a JSPDynPage and the associated JSP however the object is always null. If I store it in the session I am able to retrieve it.
Could anyone assist in how to do this?
My code is as follows, thanks and regards.
public class MyClass extends PageProcessorComponent {
private String redirectToPage = "";
private static final String INITAL_PAGE = "initialpage.jsp";
private static final String SECONDARY_PAGE = "secondarypage.jsp";
private static final String BEAN_ALIAS = "myBean";
public void doProcessBeforeOutput() throws PageException {
 if (redirectToPage == null || redirectToPage.equals("")) {
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 } else {
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public void onMyButtonEvent (Event event) {
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secondarypage.jsp:
<%@ page session = "true"%>
<%@ taglib uri="tagLib" prefix="hbj" %>
<jsp:useBean id="myBean" scope="request" class="MyBeanClass " />
<hbj:content id="myContent">
<hbj:page title="myTitle">
 <hbj:form id="myForm">
 <% if (myBean != null) {
 out.println("null");
 } else {
 out.println("not null");
 %>
 </hbj:form>
</hbj:page>
</hbj:content>
output on the page is always "null" ??

Hi,
Thanks for your posts... the null logic was actually a typo.
I've solved the problem myself - basically I think the <jsp:useBean doesn't work as I expect it (that is automatically obtain the handle to the bean):
MyDynPage.java:
package com.my;
import com.sapportals.htmlb.*;
import com.sapportals.htmlb.enum.*;
import com.sapportals.htmlb.event.*;
import com.sapportals.htmlb.page.*;
import com.sapportals.portal.htmlb.page.*;
import com.sapportals.portal.prt.component.*;
public class MyDynPage extends PageProcessorComponent {
public DynPage getPage(){
 return new MyDynPageDynPage();
public static class MyDynPageDynPage extends JSPDynPage{
 public void doInitialization(){
 public void doProcessAfterInput() throws PageException {
 public void doProcessBeforeOutput() throws PageException {
 IPortalComponentRequest componentRequest = (IPortalComponentRequest)getRequest();
 componentRequest.putValue("myRequestParam", "My Request Param Value");
 MyBean myBean = new MyBean("My Bean Title Value");
 componentRequest.putValue("myBean", myBean);
 this.setJspName("myJSP.jsp");
MyBean.java:
package com.my;
import java.io.Serializable;
public class MyBean implements Serializable {
 private String txtTitle;
 //setters
 public void setTxtTitle(String txtTitle) { this.txtTitle = txtTitle; }
 //getters
 public String getTxtTitle() { return this.txtTitle; }
 public MyBean(String txtTitle) { //constructor
 this.txtTitle = txtTitle;
myJSP.jsp:
<%@ page session = "true"%>
<%@ taglib uri="tagLib" prefix="hbj" %>
<jsp:useBean id="myBean" scope="request" class="com.my.MyBean" />
<hbj:content id="myContext" >
<hbj:page title="PageTitle">
 <hbj:form id="myFormId" >
 <%
 String myRequestParam = (String)componentRequest.getValue("myRequestParam");
 out.println("myRequestParam: " + myRequestParam + " ");
 if (myBean == null) {
 out.println("myBean is null ");
 } else {
 out.println("myBean is not null ");
 out.println(myBean.getTxtTitle() + " ");
 com.my.MyBean myOtherBean = (com.my.MyBean) componentRequest.getValue("myBean");
 if (myOtherBean == null) {
 out.println("myOtherBean is null");
 } else {
 out.println("myOtherBean is not null ");
 out.println(myOtherBean.getTxtTitle() + " ");
 %>
 </hbj:form>
</hbj:page>
</hbj:content>
The output is:
myRequestParam: My Request Param Value
myBean is null
myOtherBean is not null
My Bean Title Value
It appears that you can save objects in the request scope however you need to manually retrieve them. I'm pretty sure that this is not the case in other J2EE servers as the <jsp:useBean tag should imply that I want the bean retrieved from the scope automatically or created if it's null.
However the use of the <jsp:useBean appears to work correctly/as expected when using the session scope.
Thanks for your assistance.
DSR

How to persist a data in request scope

Hi All...
I am using JDeveloper Studio Edition Version 11.1.1.0.2.In my managed bean (backing bean scope), I have a variable say " private loginname;" with a global scope and corresponding getter and setter methods inside the backing bean.How can I persist my data in request scope not using a session variable.
Thanks in advance
Dinil Mithra

Hi all,
I need to access the data in the request scope( Not in session scope ). ie, after the command button's action or action listener ,I loose the persistence of my variable.But the same time persistence of the textfield exists.I need to implement the persistence like textbox or ADF component
Thanks for your response
Dinil Mithra
Edited by: Dinil Mithra on May 21, 2009 1:25 AM

How to set an object in attribute using tags

Hello.
I know you can do this <% request.setAttribute("someName", Object); %>
But i am wondering if there is a jsp , jstl tag which can do the same thing? Also where I can give the scope.
I would like to do something like this <jsp:someTag name="someName" value=${variable} scope="request" />
Thanks in advance.

I think you can use
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I need to set value to one of the object attributes if that attribute is blank.This is some kind of a default value that you want, then? If so then just take care of that when you output it. Use <c:if>, and if the attribute is blank then output the default value, otherwise output the attribute.
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Thanks Anthony,
I'm working with Tigi on the same project and now I can tell you that the problem is solved.
request.getRequestDisptacher("/myServlet");hehe, you switched the 't' and the 'a'
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How to set an object in request scope in a jsp uysing jstl

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