Need help with tomcat 5.5 and using java classes
hey there,
i am trying to set up tomcat 5.5 on my computer at home and have sucessfully done so. i have been trying to use Java classes inside my JSP files however tomcat thows an internal servlet error as follows:
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 144 in the jsp file: /order.jsp
Generated servlet error:
ProductList cannot be resolved to a type
An error occurred at line: 144 in the jsp file: /order.jsp
Generated servlet error:
ProductList cannot be resolved to a type
An error occurred at line: 144 in the jsp file: /order.jsp
Generated servlet error:
Product cannot be resolved to a type
i have the classes located as the setup tutorial recommends (root/WEB-INF/classes/) and still nothing works. i would appreciate any help anyone can give.
thanks,
Which tutorial are you following?
As of java1.4, all classes must be in packages for them to work in Tomcat. This means your beans and servlets too.
Put your beans in a package, and then recompile them, and put them in the right place.
eg
package com.mypackage
public class MyClass ...
once compiled would go into WEB-INF/classes/com/mypackage/MyClass.class
Are you using Product and ProductList classes in scriptlet code?
Have you imported them with a page directive
<%@ page import="com.mypackage.Product, com.mypackage.ProductList" %> ?
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hi
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Calculate PI using Random Numbers
In geometry the ratio of the circumference of a circle to its diameter is known as �. The value of � can be estimated from an infinite series of the form:
� / 4 = 1 - (1/3) + (1/5) - (1/7) + (1/9) - (1/11) + ...
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public class CalculatePI
public static boolean isInside ( double xPos, double yPos )
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Computation of PI using Random Numbers
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and below is what i have so far:
import java.util.*;
public class CalculatePI
public static boolean isInside ( double xPos, double yPos )
double distance = Math.sqrt( xPos * xPos + yPos * yPos );
public static double computePI ( int numThrows )
Random randomGen = new Random ( System.currentTimeMillis() );
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double yPos = (randomGen.nextDouble()) * 2 - 1.0;
int hits = 0;
int darts = 0;
int i = 0;
int areaSquare = 4 ;
while (i <= numThrows)
if (distance< 1)
hits = hits + 1;
if (distance <= areaSquare)
darts = darts + 1;
double PI = 4 * ( hits / darts );
i = i+1;
public static void main ( String[] args )
Scanner sc = new Scanner (System.in);
System.out.print ("Enter number of throws:");
int numThrows = sc.nextInt();
double Difference = PI - Math.PI;
System.out.println ("Number of throws = " + numThrows + ", Computed PI = " + PI + ", Difference = " + difference );
}when I tried to compile it says "cannot find variable 'distance' " in the while loop. but i thought i already declare that variable in the above method. Please give me some ideas to solve this problem and please check my program to see if there is any other mistakes.
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