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Java Forum / General / April 2007

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Error allocating a servlet instance

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scharffc@gmail.com - 09 Apr 2007 16:17 GMT
Hi,

I included the error I get in my browser, the localhost.
2007-04-08.log, the JAVA_HOME and startup.sh when running a servlet
called Login. The error is Error allocating a servlet instance. I
would appreciate any pointer to help me fix the problem.

Best,

Chris

echo $JAVA_HOME
/opt/java/jdk1.5.0_08

./startup.sh
Using CATALINA_BASE:   /home/s07-cs389-s20/tomcat
Using CATALINA_HOME:   /home/s07-cs389-s20/tomcat
Using CATALINA_TMPDIR: /home/s07-cs389-s20/tomcat/temp
Using JRE_HOME:       /opt/java/jdk1.5.0_08

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: Error allocating a servlet instance
   
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:
105)
   
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:
148)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:
868)
    org.apache.coyote.http11.Http11BaseProtocol
$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:
663)
   
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:
527)
   
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:
80)
    org.apache.tomcat.util.threads.ThreadPool
$ControlRunnable.run(ThreadPool.java:684)
    java.lang.Thread.run(Thread.java:595)

root cause

java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet
    java.lang.ClassLoader.defineClass1(Native Method)
    java.lang.ClassLoader.defineClass(ClassLoader.java:620)
    java.security.SecureClassLoader.defineClass(SecureClassLoader.java:
124)
    java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
    java.net.URLClassLoader.access$100(URLClassLoader.java:56)
    java.net.URLClassLoader$1.run(URLClassLoader.java:195)
    java.security.AccessController.doPrivileged(Native Method)
    java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
    java.lang.ClassLoader.loadClass(ClassLoader.java:251)
   
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:
1253)
   
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:
1187)
   
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:
105)
   
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:
148)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:
868)
    org.apache.coyote.http11.Http11BaseProtocol
$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:
663)
   
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:
527)
   
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:
80)
    org.apache.tomcat.util.threads.ThreadPool
$ControlRunnable.run(ThreadPool.java:684)
    java.lang.Thread.run(Thread.java:595)

note The full stack trace of the root cause is available in the Apache
Tomcat/5.5.12 logs.

*** localhost.2007-04-08.log

Apr 8, 2007 1:22:42 PM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
Apr 8, 2007 1:22:42 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
Apr 8, 2007 1:22:42 PM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
Apr 8, 2007 1:22:42 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
Apr 8, 2007 1:22:57 PM org.apache.catalina.core.StandardWrapperValve
invoke
SEVERE: Allocate exception for servlet Login
java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:
124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:
1253)
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:
1187)
at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:
1027)
at
org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:
750)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:
130)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:
178)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:
126)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:
105)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:
107)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:
148)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:
868)
at org.apache.coyote.http11.Http11BaseProtocol
$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:
663)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:
527)
at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:
80)
at org.apache.tomcat.util.threads.ThreadPool
$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
Reply to this Message
scharffc@gmail.com - 09 Apr 2007 16:19 GMT
My web.xml file is the following:

<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
 Copyright 2004 The Apache Software Foundation

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-->

<!DOCTYPE web-app
   PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
   "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>
 <servlet>
   <servlet-class>apollo</servlet-class>
   <servlet-name>apollo</servlet-name>
 </servlet>
 <servlet-mapping>
   <servlet-name>apollo</servlet-name>
   <url-pattern>/servlet/apollo</url-pattern>
 </servlet-mapping>

<servlet>
   <servlet-class>ShowBedrock</servlet-class>
   <servlet-name>ShowBedrock</servlet-name>
 </servlet>
 <servlet-mapping>
   <servlet-name>ShowBedrock</servlet-name>
   <url-pattern>/servlet/ShowBedrock</url-pattern>
 </servlet-mapping>

<servlet>
   <servlet-class>HelloWorldServlet</servlet-class>
   <servlet-name>HelloWorldServlet</servlet-name>
 </servlet>
 <servlet-mapping>
   <servlet-name>HelloWorldServlet</servlet-name>
   <url-pattern>/servlet/HelloWorldServlet</url-pattern>
 </servlet-mapping>

 <servlet>
   <servlet-class>Login</servlet-class>
   <servlet-name>Login</servlet-name>
 </servlet>
 <servlet-mapping>
   <servlet-name>Login</servlet-name>
   <url-pattern>/servlet/Login</url-pattern>
 </servlet-mapping>

 <servlet>
   <servlet-class>Logout</servlet-class>
   <servlet-name>Logout</servlet-name>
 </servlet>
 <servlet-mapping>
   <servlet-name>Logout</servlet-name>
   <url-pattern>/servlet/Logout</url-pattern>
 </servlet-mapping>

 <servlet>
   <servlet-class>Operation</servlet-class>
   <servlet-name>Operation</servlet-name>
 </servlet>
 <servlet-mapping>
   <servlet-name>Operation</servlet-name>
   <url-pattern>/servlet/Operation</url-pattern>
 </servlet-mapping>

</web-app>
Reply to this Message
vishist - 10 Apr 2007 06:26 GMT
> Hi,
>
[quoted text clipped - 165 lines]
> $ControlRunnable.run(ThreadPool.java:684)
> at java.lang.Thread.run(Thread.java:595)

The root cause points to 'NoClassDefFoundError',
(java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet). Try to
see if you have servlet jar is in the tomcat lib directory.
Reply to this Message
scharffc@gmail.com - 10 Apr 2007 11:18 GMT
I have a file servlet-api.jar in tomcat/common/lib.

Christelle
Reply to this Message


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