your exerBeanId is not instantiated, hence the NullPoint Exception.
the exerBeanId from *<jsp:useBean id="exerBeanId" scope="session"
class="jp1.exerBean" />*
is not the same in <% ... exerBeanId.setValues(v); ... %>
They are of different scope. It's been discussed in the JSP-Interest
Archive.
-----Original Message-----
From: Carl Song [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, August 21, 2001 6:21 AM
To: [EMAIL PROTECTED]
Subject: How can i pass the value(object) in jsp to javabean ?
Hi everybody out there!!!
I'm very new to JSP and not really efficient with Java either.
but here I'm tring to pass the Vector object in JSP page to Bean in
order to carry out database insertion.
>From Vector object i'm intending to get values for insert.
Does anybody know how to pass the values(object)?
Please help me!!!
Thanks
*************Here is JavaBean(exerBean.java)*********************
package jp1;
import java.util.*;
public class exerBean {
private String values ;
Vector v = new Vector();
public void setValues(Vector v){
for (int i=0; i<v.size(); i++){
String val = "";
String values;
if (!(i==(v.size()-1))){
values =val +"\""+v.get(i)+"\""+",";
}
else {
values = val +"\""+v.get(i)+"\"";
}
}//end for
//return values;
}//end setValues()
public String getString(){
return values;
}
}
*************Here is JSP page(exer.jsp)*********************
<HTML>
<HEAD>
<jsp:useBean id="exerBeanId" scope="session" class="jp1.exerBean" />
<jsp:setProperty name="exerBeanId" property="*" />
<TITLE>
exer
</TITLE>
</HEAD>
<BODY>
<% Vector v = new Vector();
v.addElement(new String("hello"));
v.addElement(new String("Bye"));
v.addElement(new String("go"));
exerBeanId.setValues(v); //***** getting
NullPoint Exception***
out.println(exerBeanId.getString());
%>
<FORM ACTION="exer.jsp" METHOD="POST">
<P>
<INPUT TYPE="SUBMIT" VALUE="ENTER">
</FORM>
</BODY>
</HTML>
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Some relevant FAQs on JSP/Servlets can be found at:
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Some relevant FAQs on JSP/Servlets can be found at:
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http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
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