Hi, I am testing the code in the book "Java Developer's guide to servelt and JSP" the part of Applet and Servlet communication. I am using JBuilder and I am totally lost what's wrong with my setting and I keep getting the error message. Pls help me with it. Thank you so much! This is the exact code in this book. package test515; import com.javaranch.common.*; // I use the package in Javaranch // You can find it in this website // And ObjectServlet is a servlet class in // that package class PipelineServlet extends ObjectServlet{ public Object doObject(Object obj){ String old = (String)obj; String s = ""; for(int i = old.length() -1;i>=0; i--){ s+= old.charAt(i); } return s; } } What I do is set up a project and import the com.javaranch.common package inthis project. And then use servlet wizard to write a servlet as above. The only difference is that it extends ObjectServlet instead of HttpServlet Here is the web.xml I think maybe there's something wrong with this But i don't know what's it. <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN" "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd"> <web-app> <servlet> <servlet-name>pipelineservlet</servlet-name> <servlet-class>test515.PipelineServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>pipelineservlet</servlet-name> <url-pattern>/pipelineservlet</url-pattern> </servlet-mapping> </web-app> The error message is like Error: 500 Location: /pipelineservletInternal Servlet Error:java.lang.IllegalAccessException: test515.PipelineServlet at java.lang.Class.newInstance0(Native Method) at java.lang.Class.newInstance(Class.java:237) at org.apache.tomcat.core.ServletWrapper.loadServlet(ServletWrapper.java:268) at org.apache.tomcat.core.ServletWrapper.init(ServletWrapper.java:289) at org.apache.tomcat.core.Handler.service(Handler.java:254) at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372) at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797) at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743) at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210) at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416) at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498) at java.lang.Thread.run(Thread.java:484) Thank you in advance! Calanthe
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