I tried to run my first servlet and got this error:
description The server encountered an internal error () that prevented it
from fulfilling this request.
exception
javax.servlet.ServletException: Error allocating a servlet instance
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:16
4)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:578)
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:209)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:781)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConn
ection(Http11Protocol.java:549)
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:589)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.ja
va:666)
java.lang.Thread.run(Unknown Source)
root cause
java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet
java.lang.ClassLoader.defineClass0(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)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.ja
va:1278)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.ja
va:1212)
java.lang.ClassLoader.loadClassInternal(Unknown Source)
java.lang.ClassLoader.defineClass0(Native Method)
java.lang.ClassLoader.defineClass(Unknown Source)
java.security.SecureClassLoader.defineClass(Unknown Source)
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassL
oader.java:1652)
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.ja
va:883)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.ja
va:1332)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.ja
va:1212)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:16
4)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:578)
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:209)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:781)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConn
ection(Http11Protocol.java:549)
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:589)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.ja
va:666)
java.lang.Thread.run(Unknown Source)
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