How to use self-defined class in a jsp page

Hello:
I defined a class for displaying purpose, which is in the different folder(WEB-INF/classes) from my JSP page.
In my JSP page, I want to create an instance of my class and display something, while I get the following error: "
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 12 in the jsp file: /htmls/templateIntro.jsp
Generated servlet error:
[javac] Compiling 1 source file
/home/jiao/jsp_webserver/tomcat/work/Standalone/localhost/syllabus/htmls/templateIntro_jsp.java:72: cannot resolve symbol
symbol : class Display
location: class org.apache.jsp.templateIntro_jsp
Display display=new Display(out);"
How can I solve this problem? Should I redefine my classpath or there are some other actions I should take.
T.I.A.
Oriental Spirit

Here is what I have done:
1) in Display.java, add one line "package tools;" on the top, and compile it to
create Display.class.
2) create a new folder at
/home/jiao/jsp_webserver/tomcat/webapps/syllabus/WEB-INF/classes
named tools and then put the Display.class into the newly created folder.
3) in my jsp page, add " import="tools.*"
But it still doesn't work.
Any ideas? T.I.A.

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