jspSetProperty Doubt??

Ranchers,

What it means by saying, "setProperty code will not be executed if the bean with the id already exists"....what exactly does that mean?? For example, assume that the id is a person with a name, so the setProperty won't be executed if the person has already a name?? Am I right?? Anyone please help me.

Thanks in advance.

For example, the code below is from Marcus Green's website,

The above being the bean class...

<jsp:useBean id="person" type="com.examulator.Person" class="com.examulator.Person" scope="session" />
<html>
<%
out.print(person.getFirstName());
%>
</html>

The above jsp page will print joe.

Now, my question is that if I don't give the values joe and soap, what will the o/p be if I execute the above jsp page?? Help me please guys.
[ January 01, 2007: Message edited by: Jothi Shankar Kumar Sankararaj ]

Hi Jothi,

Consider the below example:

<jsp:useBean id="person" class="com.bean.Person" scope="session">
<jsp:setProperty name="person" property="name" value="x"/>
</jsp:useBean>

If the container is able to find a bean named person in the Session scope, then the <jsp:setProperty> will be skipped. Otherwise, if it is unable to find an object named person in the session scope, then a new object of com.bean.Person will be created and the name property will be set to the value "x".

The <jsp:setProperty> is like passing a value to the constructor of the bean while initializing.

Hi,

Now, my question is that if I don't give the values joe and soap, what will the o/p be if I execute the above jsp page?? Help me please guys.

if you dont give any default values, null will be print.

Vijayakumar,

Thanks for the reply, and if I include the jspSetProperty line,

<jsp:setProperty name="person" property="firstName" value="Marcus"/>
<jsp:setProperty name="person" property="lastName" value="Green"/>

then the above values will be printed out right??

if I include the jspSetProperty line,

<jsp:setProperty name="person" property="firstName" value="Marcus"/>
<jsp:setProperty name="person" property="lastName" value="Green"/>

then the above values will be printed out right??

The place where you use <jsp:setProperty> matters. If you use it in the body of the <jsp:useBean> tag, then it will get executed if the object with the given id is not found in the given scope.

if it is used outside <jsp:useBean> as below, it will get executed for both new and existing object.
<jsp:useBean id="person" class="com.bean.Person" scope="session"/>

<jsp:setProperty name="person" property="firstName" value="Marcus"/>
<jsp:setProperty name="person" property="lastName" value="Green"/>

Hope you got it cleared. Let me know if you still have some doubts.

Vijaykumar,

Thanks for the explanation and I got it cleared. Thanks once again!