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Java.lang.ClassNotFoundException: HelloServlet on org.apache.catalina.loader.WebappClassLoader.loadClass

I have a Hello World servlet in webapps/hello/WEB-INF/class/HelloServlet.classand I registered it as shown below in web.xml:

<servlet>
    <servlet-name>helloServlet</servlet-name>
    <servlet-class>HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>helloServlet</servlet-name>
    <url-pattern>/HelloServlet</url-pattern>
</servlet-mapping>

However, Tomcat was unable to start with the exception below:

Apr 30, 2012 1:50:10 PM org.apache.catalina.core.ApplicationContext log
INFO: Marking servlet HelloServlet as unavailable
Apr 30, 2012 1:50:10 PM org.apache.catalina.core.ApplicationContext log
java.lang.ClassNotFoundException: HelloServlet
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1128)
    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:827)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
    at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:877)
    at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process
(Http11AprProtocol.java:594)
    at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1675)
    at java.lang.Thread.run(Unknown Source)

Apr 30, 2012 1:50:10 PM org.apache.catalina.core.StandardWrapperValve invoke

How is this caused and how can I solve it?

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4 answers

The main problem is that your servlet class does not have a package. Announce it.

package com.example;

public class HelloServlet extends HttpServlet {

And when registering in, web.xmlmake sure you include the package:

<servlet-class>com.example.HelloServlet</servlet-class>

In addition, your class file should be inside the directory /WEB-INF/classes, not /WEB-INF/class.

webapps/hello/WEB-INF/classes/com/example/HelloServlet.class
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HelloServlet ( ).

+2

, :

package com.yourpackage;

import java.io.IOException;
import java.util.ResourceBundle;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet implementation class HelloWorldServlet
 */
@WebServlet("/HelloWorldServlet")
public class HelloWorldServlet extends HttpServlet {

. WebServlet

!!

+1

( "" ), , maven ( eclipse maven → Update Project) eclipse, tomcat. , , maven , , tomcat.

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