[英]Tomcat 404 classNotFoundException in HelloWorld servlet
I see most of similar problems and try most solutions, but nothing has worked for me! 我看到了大多数类似的问题,并尝试了大多数解决方案,但是没有任何效果对我有用!
I am completely new in Java EE
and this is my first servlet. 我对
Java EE
完全Java EE
,这是我的第一个servlet。
This is my servlet that placed in: C:\\tomcat\\webapps\\jspbook\\WEB-INF\\classes
这是我的servlet,它位于:
C:\\tomcat\\webapps\\jspbook\\WEB-INF\\classes
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class HelloWorld extends HttpServlet {
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title> hello World Title </title>");
out.println("</head>");
out.println("<body>");
out.println("<h1> Hello To World in body!</h1>");
out.println("</body>");
out.println("</html>");
}
}
And this is web.xml
file in C:\\tomcat\\webapps\\jspbook\\WEB-INF
这是
C:\\tomcat\\webapps\\jspbook\\WEB-INF
web.xml
文件
<servlet>
<servlet-name>HelloWorld</servlet-name>
<servlet-class>HelloWorld</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloWorld</servlet-name>
<url-pattern>/HelloWorld</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file> welcome.html </welcome-file>
</welcome-file-list>
</web-app>
Now, when i restart tomcat, and try http://127.0.0.1:8080/jspbook/HelloWorld
现在,当我重新启动tomcat时,尝试
http://127.0.0.1:8080/jspbook/HelloWorld
At first time Time this is my first error: 第一次,这是我的第一个错误:
type Exception report
message Error instantiating servlet class HelloWorld
description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Error instantiating servlet class HelloWorld
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2462)
org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2451)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Thread.java:722)
root cause
java.lang.ClassNotFoundException: HelloWorld
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2462)
org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2451)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Thread.java:722)
And when i reload the page, this is my second error: 当我重新加载页面时,这是我的第二个错误:
HTTP Status 404 -
type Status report
message
description The requested resource is not available.
What is wrong with my code? 我的代码有什么问题?
UPDATE: 更新:
I create a package and named it com.jspbook
and placed it in here C:\\tomcat\\webapps\\jspbook\\WEB-INF\\classes\\com\\jspbook\\HelloWorld.java
我创建了一个程序包,并将其命名为
com.jspbook
,并将其放在此处C:\\tomcat\\webapps\\jspbook\\WEB-INF\\classes\\com\\jspbook\\HelloWorld.java
package com.jspbook;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class HelloWorld extends HttpServlet {
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title> hello World Title </title>");
out.println("</head>");
out.println("<body>");
out.println("<h1> Hello To World in body! </h1>");
out.println("</body>");
out.println("</html>");
}
}
web.xml
is here: C:\\tomcat\\webapps\\jspbook\\WEB-INF\\web.xml
web.xml
在这里: C:\\tomcat\\webapps\\jspbook\\WEB-INF\\web.xml
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" version="2.4">
<servlet>
<servlet-name>HelloWorld</servlet-name>
<servlet-class>com.jspbook.HelloWorld</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloWorld</servlet-name>
<url-pattern>/HelloWorld</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file> welcome.html </welcome-file>
</welcome-file-list>
</web-app>
I try http://127.0.0.1:8080/jspbook/HelloWorld
but the same Error appear! 我尝试
http://127.0.0.1:8080/jspbook/HelloWorld
但出现相同的错误!
(There is no compiled class file at all) (根本没有编译的类文件)
Please put the servlet in a package. 请将servlet放在一个包中。 The container is unable to load classes from default package.
容器无法从默认包中加载类。
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