Dear,I have an "Apache Tomcat/6.0.14" installed on the latest version of ubuntu 
osI am trying to add a servlet to the example application, I put my class in a 
jar file and put it in "tomcat_home/webapps/examples/WEB-INF/lib/"and i made 
the necessary modification to the web.xml fileand when I call the servlet I got 
this error:
type Status report
message Servlet BrowseRegions is not available
description The requested resource (Servlet BrowseRegions is not available) is 
not available.so I made an " export 
CLASSPATH=/tmp/tomcat/webapps/examples/WEB-INF/lib/my-jar.jar"and after 
restarting tomcat The error message changed to this,
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.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
  org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
  org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)   
  org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)    
  
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
        org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) 
java.lang.Thread.run(Thread.java:619)
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$000(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:276)   
java.lang.ClassLoader.loadClass(ClassLoader.java:251)   
java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)   
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$000(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:276)   
java.lang.ClassLoader.loadClass(ClassLoader.java:251)   
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1273)
     
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
     
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
  org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
  org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)   
  org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)    
  
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
        org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) 
java.lang.Thread.run(Thread.java:619)what could possibly be the reason that it 
was not loading the jar file at first, and why can't it find the httpServlet 
now although the example HelloWorldExample is working fineThank you for your 
timeRegardsOmar

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