HTTP状态500 - 在eclipse maven中实例化servlet时出错
[英]HTTP Status 500 - Error instantiating servlet in eclipse maven
问题描述
I am trying to run a simple servlet in maven using eclipse. 
我试图使用eclipse在maven中运行一个简单的servlet。 But getting error 500. Please see what I am doing wrong. 但得到错误500.请看我做错了什么。 Main concern is how to run a servlet in maven as I am not familiar with maven . 主要关注的是如何在maven中运行servlet，因为我不熟悉maven。
index.jsp 的index.jsp
<html>
<body>
<h2>Hello World!</h2>
<form action="mylog" method="post">
loginID:<input type="text" name="name"/><br/>
<input type="submit" value="login"/>
</form>
</body>
</html>
mylog.java (servlet class) mylog.java（servlet类）
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 mylog extends HttpServlet {
private static final long serialVersionUID = 1L;
public mylog() {
super();
// TODO Auto-generated constructor stub
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String n = request.getParameter("name");
PrintWriter out = response.getWriter();
out.print(n);
out.close();
doGet(request, response);
}
}
web.xml and directory structure- see attached image web.xml和目录结构 - 参见附图
error stack 错误堆栈
HTTP Status 500 - Error instantiating servlet class com.issac.mylog
type Exception report
message Error instantiating servlet class com.issac.mylog
description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Error instantiating servlet class com.issac.mylog
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1100)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:687)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Unknown Source)
root cause
java.lang.ClassNotFoundException: com.issac.mylog
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1333)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1167)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1100)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:687)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Unknown Source)
2 个解决方案
解决方案1
2 2016-11-05 21:15:09
src/main/resources is for placing properties files (or static resources), So the server could NOT find class files, so you need to create the Java source files under src/main/java folder. src/main/resources用于放置properties文件（或静态资源），因此服务器找不到类文件，因此需要在src/main/java文件夹下创建Java源文件。
Also, make sure that the .class files are generated and available in the Server classpath (ie, under WEB-INF/classes ), which will resolve the above java.lang.ClassNotFoundException 此外，确保生成.class文件并在Server类路径中可用（即，在WEB-INF/classes ），这将解决上述java.lang.ClassNotFoundException
解决方案2
1 已采纳 2016-11-05 21:08:05
创建一个源文件夹src/main/java并在那里移动java源文件
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