weird error when using a java bean with my jsp

[david eberhardt]

I have a web page that is asking the user to select from a choice of check boxes and sned it to a jsp (http://localhost:8080/card_trick_results.jsp) for processing.
the jsp page calls on a javabean (CardTotal.class) to process the logic:
here is some of the code from the top of the CardTotal.java file -

import java.util.*;
public class CardTotal {
private int card1;
private int card2;
private int card3;
private int card4;
private int card5;
private int card6;
private int card7;
private int totalCard = 0;
// no arg constructor
public CardTotal() {
  }
public int getTotalCard () {
return totalCard=card1+card2+card3+card4+card5+card6+card7;
}
public void setTotalCard () {
//
totalCard=card1+card2+card3+card4+card5+card6+card7;
}
public int getCard1 () {
return card1;
}
public void setCard1 (String card1) {
this.card1=Integer.parseInt(card1);
}
  

the problem:
When I execute the jps page, the server responds with an error:

org.apache.jasper.JasperException:
Can't find a method to write property 'card1' of
type 'int' in a bean of type 'CardTotal'

now, if I rewrite

public int getCard1 () {
return card1;
}

to

public int getcard1 () {
return card1;
}

and recompile this class, then the jsp page is able to process and return the correct page result.
If I shut down and reboot the computer and restart tomcat, I get the same sequence of problems again!
[b] anybody know what is happening?

[Bear Bibeault]

You didn't show how you are accessing the Card1 property from the JSP. From the error message, I'm assuming you are trying to set it from an int.
In which case:

public void setTotalCard () {  

is not a valid bean mutator signature.
Something along the lines of

public void setTotalCard( int value ) { 

should keep it happy.
hth,
bear
[ April 01, 2003: Message edited by: Bear Bibeault ]

[david eberhardt]

Originally posted by Bear Bibeault:
[QB]You didn't show how you are accessing the Card1 property from the JSP. From the error message, I'm assuming you are trying to set it from an int.

Bear,
my JSp page takes parameters from checkboxes in a form from a previous html page as follows:

<%@ page import="CardTotal" %>
<jsp:useBean id="orderedCard" class="CardTotal">
</jsp:useBean>
<jsp:setProperty name="orderedCard" property="card1" param="card1" />
<jsp:setProperty name="orderedCard" property="card2" param="card2" />
<jsp:setProperty name="orderedCard" property="card3" param="card3" />
<jsp:setProperty name="orderedCard" property="card4" param="card4" />
<jsp:setProperty name="orderedCard" property="card5" param="card5" />
<jsp:setProperty name="orderedCard" property="card6" param="card6" />
<jsp:setProperty name="orderedCard" property="card7" param="card7" />   

here is the line where I get the totalCard value back to the JSP page:

<!-- two ways to get the totalCard property -->

You picked the number: <b><%= orderedCard.getTotalCard() %></b>
<br><br>
You picked the number: <b><jsp:getProperty name="orderedCard" property="totalCard" />
  

and here is more of the "bean" I'm using:

import java.util.*;
public class CardTotal {
private int card1;
private int card2;
private int card3;
private int card4;
private int card5;
private int card6;
private int card7;
private int totalCard = 0;
// no arg constructor
public CardTotal() {
  }
public int getTotalCard () {
return totalCard=card1+card2+card3+card4+card5+card6+card7;
}
public void setTotalCard () {
//
totalCard=card1+card2+card3+card4+card5+card6+card7;
}

public String getCard1 () {
return Integer.toString(card1);
}
public void setCard1 (String card1) {
this.card1=Integer.parseInt(card1);
}
etc, etc,
}

[b]I never really use the getCard1() method, but if you look at my getCard1() method, you can see that I have changed it from the original.
This works now every time I reboot the computer.
The odd thing to me was that I could get it to work if I changed the case of the getCard1() to getcard1() and recompiled without rebooting BUT if I rebooted, then it would give me the error msg.
NOTED: Your criticism of my setTotalCard() method is noted and I will change those methods !!!
[ April 02, 2003: Message edited by: david eberhardt ]

[david eberhardt]

maybe the problem is related to the following:
I send info to the bean from my jsp like this:

<%@ page import="CardTotal" %>
<jsp:useBean id="orderedCard" class="CardTotal">
</jsp:useBean>
<jsp:setProperty name="orderedCard" property="card1" param="card1" />
<jsp:setProperty name="orderedCard" property="card2" param="card2" />
<jsp:setProperty name="orderedCard" property="card3" param="card3" />
<jsp:setProperty name="orderedCard" property="card4" param="card4" />
<jsp:setProperty name="orderedCard" property="card5" param="card5" />
<jsp:setProperty name="orderedCard" property="card6" param="card6" />
<jsp:setProperty name="orderedCard" property="card7" param="card7" />  

in my bean, I set up variables to hold the values sent via "card1" parameter, "card2" parameter, etc like this:

public class CardTotal {
private int card1;
private int card2;
private int card3;
private int card4;
private int card5;
private int card6;
private int card7;
private int totalCard = 0;
// no arg constructor
public CardTotal() {
}
public int getTotalCard () {
   setTotalCard();
   return totalCard;
}
public void setTotalCard () {
   //
totalCard=card1+card2+card3+card4+card5+card6+card7;
}
public int getCard1 () {
   return card1;
   // return Integer.toString(card1);
}
//takes a string an makes it an int
public void setCard1 (String card1) {
   this.card1=Integer.parseInt(card1);
}

here is the method that is giving me an error msg:

[B]public int getCard1 () {
   return card1;
   // return Integer.toString(card1);
}[/B]

I don't call upon this method from my JSP, but I think it is causing an error because it may be trying to return the parameter called called "card1" which came in as a String from the JSP ???
[ April 02, 2003: Message edited by: david eberhardt ]

[david eberhardt]

Originally posted by Bear Bibeault:
You didn't show how you are accessing the Card1 property from the JSP. From the error message, I'm assuming you are trying to set it from an int.

Bear;
You steered me into the right direction - the problem was the getCard() methods; orignally I had:

public int getCard1 () {
   return card1;
}
public void setCard1 (String card1){
   this.card1=Integer.parseInt(card1);
}

When I set the card1, I brought in the value as a String, when I attempted to get card1, I used an int return type.
So i changed the two methods to be consistent with each other:

public int getCard1 () {
   return card1;
}
public void setCard1 (int card1) {
   this.card1=card1;
}

For some reason, unknown to me at this time, the getter and setter methods for a particular property (int card1) need to match up in regards to the arg type supplied to the setter and the return type of the getter. This is somewhat of a guess on my part.
thanks for the help.
[ April 02, 2003: Message edited by: david eberhardt ]