超级菜鸟问题，新手求助ToT
两个文件，一个helloWorld.java一个hello.jsp
--------------- <hello.jsp> -------------------------------
<HTML>
<TITLE> HelloWorld! Applet </TITLE>
Applet的Hello World程序
<p>
<APPLET
CODE= "HelloWorld.class "
WIDTH=200
HEIGHT=100>
</APPLET>
</HTML>
---------------- <helloWorld.java> ----------------------------------
import java.awt.*;
import java.applet.*;
public class HelloWorld extends Applet
{
public void paint(Graphics g)
{
g.drawString( "Hello World! ",5,35);
}
}
__________________________________________
我照着书打的，应该没错，编译helloWorld.java也通过了，可是在输入......../hello.jsp后出现以下错误报告
HTTP Status 500 -
--------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException:
java.lang.NoClassDefFoundError: javax/el/ELResolver
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:274)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause
java.lang.
NoClassDefFoundError: javax/el/ELResolver
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClass(Unknown Source)
java.security.SecureClassLoader.defineClass(Unknown Source)
java.net.URLClassLoader.defineClass(Unknown Source)
java.net.URLClassLoader.access$100(Unknown Source)
java.net.URLClassLoader$1.run(Unknown Source)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(Unknown Source)
java.lang.ClassLoader.loadClass(Unknown Source)
java.lang.ClassLoader.loadClass(Unknown Source)
sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
java.lang.ClassLoader.loadClass(Unknown Source)
java.lang.ClassLoader.loadClass(Unknown Source)
java.lang.ClassLoader.loadClassInternal(Unknown Source)
org.apache.jasper.runtime.JspFactoryImpl.getJspApplicationContext(JspFactoryImpl.java:200)
org.apache.jsp.hello_jsp._jspInit(hello_jsp.java:22)
org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:159)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.13 logs.
求大侠告诉我这个问题怎么解决？
swing监听器的有关问题 