JSP newbie: My first JavaBean

[BlueBeep]

Hey guys. This is my first time with JSP, and I'm trying to create a JavaBean. I seem to be getting an error when I try to set up the following:

I have a folder called "test" which is the root of my app. Under this directory, I have a folder called "WEB-INF", then a folder called "classes" then the folder called "mathy". Under "mathy" I have a the java file called average.java along with the compiled class file.

The code for average.java is as follows:

package mathy;
import java.io.Serializable;

public class average implements Serializable {

private double total = 0;
public average(double n1, double n2, double n3) {
total = n1 + n2 + n3;
total = total / 3;
}
public double getAverage() {
return total;
}
}

then under the original "test" folder, I have a jsp page called "exp-1.jsp" with the following code:

<% mathy.average av1 = new mathy.average(34.4, 56.1, 694.3); %>

Now, I'm not trying to execute any methods, just trying to see if a bean can be made. But now luck. Can anyone help? Thanks, I really appreciate it.


I get the following error by the way with Tomcat Version 4.0-b5:


A Servlet Exception Has Occurred
org.apache.jasper.JasperException: Unable to compile class for JSPC:\jakarta-tomcat-4.0-b5\work\localhost\test\exp_0002d4_jsp.java:55: Class mathy.average not found.
mathy.average av1 = new mathy.average(34.4, 56.1, 694.3);
^
C:\jakarta-tomcat-4.0-b5\work\localhost\test\exp_0002d4_jsp.java:55: Class mathy.average not found.
mathy.average av1 = new mathy.average(34.4, 56.1, 694.3);
^
2 errors

 

[Targol]

You've got to import your class into your JSP by adding the following line at the top of your page :

<%@ page import=&quot;mathy.average&quot; %>

Water is not bad as soon as it stays out human body ;-)

 

[BlueBeep]

Thanks for the reply! However, now I just get one error instead of two. Someone mentioned that I had to include

import java.beans.*;

in my original java bean. Is this correct? I response would be greatly appreciated. Thanks again!

The error:

A Servlet Exception Has Occurred
org.apache.jasper.JasperException: Unable to compile class for JSPC:\jakarta-tomcat-4.0-b5\work\localhost\test\exp_0002d6_jsp.java:3: Class mathy.average not found in import.
import mathy.average;
^
1 error

 

[Targol]

Here, I think you've got a tomcat config problem. It seems that tomcat doesn't know where to find your &quot;average&quot; class.
Well, try to create a &quot;mathy&quot; directory under the &quot;WEB-INF&quot; directory and put your &quot;average.class&quot; in. Because your directories structure must respect your packages structure.

Tell me if It works better. Water is not bad as soon as it stays out human body ;-)

 

[BlueBeep]

I can kiss you... it works! Finally... you have no idea in how many places I asked this... =) Thank you thank you! It also works if I name my package &quot;classes.mathy&quot; instead of just mathy. Why is this? I thought Tomcat automatically looked for classes in the WEB-INF\classes folder... or so I thought by this book I'm reading.

Also, everytime I edit a JSP file, and I try to refresh, I don't get an updated version... just the original page that I viewed first. Got a solution? Wanna go two for two? =)

 

[Targol]

As I told you before, the WEB-INF directory is the root directory for all your classes. In this directory, the structure must exactly match the packages structures. ie: if you've got 2 classes :

toto.tutu.myclass

and

toto.tata.anotherClass

, the directories structures under WEB-ROOT must be :
WEB-ROOT
|- toto
|- tutu
| |- myclass
|- tata
|- anotherClass

For the refresh problem, it's due to page caching. This caching can either be client side so you've got to delete the &quot;temporary internet files&quot; folder under your profile; or server size then delete the &quot;Work&quot; directory under the %tomcatHome% directory.

Sorry, i'm french and my english is poor (but my tailor is rich ;-)) and I don't understand &quot;Wanna go two for two?&quot; Water is not bad as soon as it stays out human body ;-)

 

[BlueBeep]

Thanks for the help! I still have no luck with the refresh however. No matter how many times I try to delete the work directory, restart tomcat - nothing. I have to delete the work direectory manually everytime I want to refresh the JSP for an update that I did. Any solutions? Thanks.

As far as the expression &quot;two for two&quot; - it just simple means succeeding at two things straight in a row. =)