Can any body tell how to call a java method from jsp. i am pasting my program here

CheckValue.jsp

<%@page contentType="text/html"%>
<html>
<head><title>CheckValue</title></head>
<body>
<table>
<tr>
<td>FieldName</td>
<td><input name="name" value="" size="40"/></td>
</tr>
<tr><td><input type="SUBMIT" value="Submit" /> </td>
</tr>
</table>
<jsp:useBean id="link" scope="application" class = "CheckValue" />
<jsp:setProperty name="link" property="*" />


</body>
</html>


CheckValue.java

import java.util.*;
import java.awt.*;
import javax.swing.*;
import java.sql.*;
import java.lang.*;

class overload
{
// For checking the null values
void CheckValue(String FieldValue)
{
System.out.println(" check for the field value null");
}
// To check the error message for date,character, number
void CheckValue(String LvValue1 ,String LvValue2)
{
String LvFieldMessage1;
String LvFieldMessage2;
System.out.println("This part is used to check for the error message");
}
// This part is used to compare the operators with the vlues.
void CheckValue(String FieldName, String LvOperator, String LvValue1, String LvValue2, String LvCheckForNull, String FieldValue)
{
System.out.println("This part is used to compare the two values using operators");
}
}
class CheckValue
{
public static void main(String args[])
{
try
{
overload ob = new overload();

ob.CheckValue("");
ob.CheckValue("10", "20");
}catch(Exception e){
System.out.println("Error in the main" +e);
}
}
}

When i am executing the jsp file it is saying : The value for the useBean class attribute CheckValue is invalid.
this error is coming.

Can anybody tell me how to solve this.