Hi Emmanuel,
You did not set persons in init() instead you added a person object with
"person" attribute name in the servletContext. And usually you don't put
those in init(). persons should be a List or Map of items. What you could
have done is this:
Person person = new Person();
List<Person> persons = new ArrayList<Person>();
persons.add(person);
sce.getServletContext().setAttribute("persons", persons);
Hope you don't mind me sharing this back to the group cause I think it might
be useful to others too.
Regards,
Bob
On Tue, Nov 17, 2009 at 1:08 AM, emmanuel <emmanuel.fan...@mindspring.com>wrote:
> Hello Bob,
>
> Thanks for your explanation, I seem to get a hang of it now, but my problem
> is you said "Where did you set the collection "persons"? Remember that when
> you use EL in JSP it does not print null but instead an empty String if it
> encounters a null value.". This is the part I do not understand. I thought
> I did this in init.java
>
>
>
> Person person = new Person();
> person.setName(name);
>
> sce.getServletContext().setAttribute("person", person);
>
>
>
> If you can kindly explain how to do this, I will greatly appreciate it.
>
> Thanks
>
> Emmanuel
>
> -----Original Message-----
> From: Bob Santos
> Sent: Nov 11, 2009 10:50 AM
> To: emmanuel.fan...@mindspring.com
> Cc: J2EEQuestion
> Subject: [java ee programming] Re: Homework 4006
>
> Hi Emmanuel,
>
> <jsp:useBean id="person" scope="session"
> class="org.apache.taglibs.standard.examples.beans.Person" />
>
>> <jsp:setProperty name="person" property="*" />
>
>
> What are you trying to do with these lines?
> Are you aware that what you're doing on the first line is creating a new
> Person bean that has a session scope if there's no bean with "person" as its
> id?
> And you are setting all of the properties of that Person bean with nothing
> on the second line?
> I assume this is not what you wanted to do instead you want to access the
> Person bean you set in servletContext which I think is called the
> application scope. If you want to access that you could have used
> ${applicationScope.person.name.firstName} and
> ${applicationScope.person.name.lastName} where applicationScope sets the
> server to look in application scope only instead of going thru the other
> scopes first.
>
> <table border="1">
> <c:forEach var="person" items="${persons}">
> <tr>
> <td><c:out value="${person.name.firstName}"/> </td>
>
>> <td><c:out value="${person.name.lastName}"/> </td>
>> </tr>
>> </c:forEach>
>
> </table>
>
>
> Where did you set the collection "persons"? Remember that when you use EL
> in JSP it does not print null but instead an empty String if it encounters a
> null value.
>
>
> Regards,
>
> Bob
> On Wed, Nov 11, 2009 at 9:21 PM, emmanuel
> <emmanuel.fan...@mindspring.com>wrote:
>
>>
>> Help Class,
>> Can anyone help with lab 4006? I don't know why First and Last names were
>> not displaying.
>>
>> I have this codes in Name Class.
>>
>> package org.apache.taglibs.standard.examples.beans;
>>
>> public class Name {
>>
>> private String firstName;
>> private String lastName;
>>
>> public String getFirstName() {
>> return firstName;
>> }
>> public void setFirstName(String firstName) {
>> this.firstName = firstName;
>> }
>> public String getLastName() {
>> return lastName;
>> }
>> public void setLastName(String lastName) {
>> this.lastName = lastName;
>> }
>> }
>>
>> ---------------------------------------------------------
>> I have this codes in Person Class.
>>
>> package org.apache.taglibs.standard.examples.beans;
>>
>> public class Person {
>>
>> private Name name;
>>
>> public Name getName() {
>> return name;
>> }
>> public void setName(Name name) {
>> this.name = name;
>> }
>> }
>>
>> ---------------------------------------------------------
>> I placed this code at the end of Init.
>>
>> import org.apache.taglibs.standard.examples.beans.*;
>> Name name = new Name();
>> name.setFirstName("Emmanuel");
>> name.setLastName("Faneye");
>>
>> Person person = new Person();
>> person.setName(name);
>>
>> sce.getServletContext().setAttribute("person", person);
>>
>> ---------------------------------------------------------
>>
>> This code goes to the end of reponse.
>>
>> <jsp:useBean id="person" scope="session"
>> class="org.apache.taglibs.standard.examples.beans.Person" />
>> <jsp:setProperty name="person" property="*" />
>> <br>
>> <br>
>>
>> <table border="1">
>> <c:forEach var="person" items="${persons}">
>> <tr>
>> <td><c:out value="${person.name.firstName}"/> </td>
>> <td><c:out value="${person.name.lastName}"/> </td>
>> </tr>
>> </c:forEach>
>> </table>
>>
>>
>> Thanks for any help.
>>
>>
>>
>>
>
> >
>
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