Cannot build jsp pages

[Revenge]

hi all,
i've a JBuilder project with some packages and some jsp pages using these
packages.
When i try to build the project , there aren't errors or warnings but the
jsp pages are not built because there aren't the java files generated
(example index_jsp.java)
If I try to load the main jsp page from JBuilder it seems to work (even if
the index_jsp.java, etc....are not visible in project) but if I build a War
file and I deploy it under Tomcat 5.5, my browser says:


HTTP Status 500 -

----------------------------------------------------------------------------
----

type Exception report

message

description The server encountered an internal error () that prevented it
from fulfilling this request.

exception

org.apache.jasp er.JasperExcept ion: Unable to load class for JSP

org.apache.jasp er.JspCompilati onContext.load( JspCompilationC ontext.java:591 )

org.apache.jasp er.servlet.JspS ervletWrapper.g etServlet(JspSe rvletWrapper.ja v
a:137)

org.apache.jasp er.servlet.JspS ervletWrapper.s ervice(JspServl etWrapper.java: 3
08)
org.apache.jasp er.servlet.JspS ervlet.serviceJ spFile(JspServl et.java:295)
org.apache.jasp er.servlet.JspS ervlet.service( JspServlet.java :245)
javax.servlet.h ttp.HttpServlet .service(HttpSe rvlet.java:802)

root cause

java.lang.Class NotFoundExcepti on: org.apache.jsp. admin_jsp
java.net.URLCla ssLoader$1.run( Unknown Source)
java.security.A ccessController .doPrivileged(N ative Method)
java.net.URLCla ssLoader.findCl ass(Unknown Source)
org.apache.jasp er.servlet.Jasp erLoader.loadCl ass(JasperLoade r.java:158)
org.apache.jasp er.servlet.Jasp erLoader.loadCl ass(JasperLoade r.java:71)

org.apache.jasp er.JspCompilati onContext.load( JspCompilationC ontext.java:589 )

org.apache.jasp er.servlet.JspS ervletWrapper.g etServlet(JspSe rvletWrapper.ja v
a:137)

org.apache.jasp er.servlet.JspS ervletWrapper.s ervice(JspServl etWrapper.java: 3
08)
org.apache.jasp er.servlet.JspS ervlet.serviceJ spFile(JspServl et.java:295)
org.apache.jasp er.servlet.JspS ervlet.service( JspServlet.java :245)
javax.servlet.h ttp.HttpServlet .service(HttpSe rvlet.java:802)

note The full stack trace of the root cause is available in the Apache
Tomcat/5.5.7 logs.



Could you help me?
thanks in advance, Revenge