Привет,
Ставлю OpenCMS 6.2.2 на следующую машину:
ОС: FreeBSD 6.1R
tomcat-5.5.20
diablo-jdk15
это всё из портов.
в tomcat-овском server.xml всё по умолчанию.

На первой же странице http://localhost:8180/setup/ вылетает ошибка
о которой гугл молчит.

HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to load class for JSP
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:512)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause
org.apache.jasper.JasperException: Unable to load class for JSP
    org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:598)
    org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:147)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause
java.lang.ClassNotFoundException: org.apache.jsp.index_jsp
    java.net.URLClassLoader$1.run(URLClassLoader.java:200)
    java.security.AccessController.doPrivileged(Native Method)
    java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:133)
    org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:65)
    org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:596)
    org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:147)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.5.20 logs.

в логе такие же строчки.