Apache Tomcat Error

See the following error to access the localhost:8080:

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: java.lang.ClassNotFoundException: org.apache.jsp.index_jsp
    org.apache.jasper.servlet.JspServletWrapper.getServlet(Unknown Source)
    org.apache.jasper.servlet.JspServletWrapper.service(Unknown Source)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(Unknown Source)
    org.apache.jasper.servlet.JspServlet.service(Unknown Source)
    javax.servlet.http.HttpServlet.service(Unknown Source)
root cause

java.lang.ClassNotFoundException: org.apache.jsp.index_jsp
    java.net.URLClassLoader$1.run(URLClassLoader.java:217)
    java.security.AccessController.doPrivileged(Native Method)
    java.net.URLClassLoader.findClass(URLClassLoader.java:205)
    org.apache.jasper.servlet.JasperLoader.loadClass(Unknown Source)
    org.apache.jasper.servlet.JasperLoader.loadClass(Unknown Source)
    org.apache.jasper.servlet.JspServletWrapper.getServlet(Unknown Source)
    org.apache.jasper.servlet.JspServletWrapper.service(Unknown Source)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(Unknown Source)
    org.apache.jasper.servlet.JspServlet.service(Unknown Source)
    javax.servlet.http.HttpServlet.service(Unknown Source)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.23-gentoo logs.

Apache Tomcat/7.0.23-gentoo