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问题：

Servlet启动错误-“请求的资源不可用”

徐皓君
2023-03-14

我知道这里给其他有这种/类似问题的人的建议，即servlet最好是在包下编写的，而不是无包的，但我在这方面遵循教科书的指导，当然作为教科书，它的方法必须有效。我用这种方法寻求帮助。

我有一个名为htmlbank.Java的Java servlet，我成功地编译了它，没有出现编译错误。现在，根据课本：

1）将.class文件放入C:\Program Files\Apache Software Foundation\Tomcat5.5\webapps\ROOT\WEB-INF\classes文件夹。

2）运行Tomcat服务-它正在运行（显示为屏幕右下角的绿色“Play”箭头）。

3）在浏览器中，键入URL:http://localhost:8080/servlet/htmlbank并输入。这样做后，将出现以下错误：

错误。

import javax.servlet.*;
import javax.servlet.http.*;

import java.io.*;
import java.util.*;

public class HTMLBank extends HttpServlet
{
    public void init() throws ServletException {}

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();

        response.setHeader("Expires", "Tues, 01 Jan 1980 00:00:00 GMT");

        out.println("<html>");
            out.println("<title>Online Bank ATM Simulator</title>");
            out.println("<h1>Tester Text.</h1>");
            out.println("<body>This serves to test functioning of the servlet in browser.</body>");
        out.println("</html>");
    }

    public void destroy(){}
}

<?xml version="1.0" encoding="ISO-8859-1"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
    version="2.4">

  <display-name>Welcome to Tomcat</display-name>
  <description>
     Welcome to Tomcat
  </description>

<!-- JSPC servlet mappings start -->

    <servlet>
        <servlet-name>org.apache.jsp.index_jsp</servlet-name>
        <servlet-class>org.apache.jsp.index_jsp</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>org.apache.jsp.index_jsp</servlet-name>
        <url-pattern>/index.jsp</url-pattern>
    </servlet-mapping>

<!-- JSPC servlet mappings end -->

<-- added the following for invoker servlet -->
    <servlet>
        <servlet-name>invoker</servlet-name>
        <servlet-class>
            org.apache.catalina.servlets.InvokerServlet
        </servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>invoker</servlet-name>
        <url-pattern>/servlet/*</url-pattern>
    </servlet-mapping>

</web-app>

下面是context.xml文件：

<!-- The contents of this file will be loaded for each web application -->
<Context reloadable="true">     <!-- Enabled Tomcat Servlet reloading -->

    <!-- Default set of monitored resources -->
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
    <WatchedResource>META-INF/context.xml</WatchedResource>

    <!-- Uncomment this to disable session persistence across Tomcat restarts -->
    <!--
    <Manager pathname="" />
    -->

</Context>

这个文件被编辑为启用servlet重新加载，也是按照图书指南。

以下是本讨论中涉及的所有文件/文件夹的路径：

因此，正如我所说的，我需要在没有包的情况下从根操作servlet。我该怎么做？

如果有助于识别问题，我还发布了Tomcat生成的错误日志文件的内容：

08 Sep 2017 10:47:53 AM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
08 Sep 2017 10:47:53 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 3887 ms
08 Sep 2017 10:47:54 AM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
08 Sep 2017 10:47:54 AM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.5.7
08 Sep 2017 10:47:54 AM org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
08 Sep 2017 10:47:56 AM org.apache.catalina.core.ApplicationContext log
INFO: org.apache.webapp.balancer.BalancerFilter: init(): ruleChain: [org.apache.webapp.balancer.RuleChain: [org.apache.webapp.balancer.rules.URLStringMatchRule: Target string: News / Redirect URL: http://www.cnn.com], [org.apache.webapp.balancer.rules.RequestParameterRule: Target param name: paramName / Target param value: paramValue / Redirect URL: http://www.yahoo.com], [org.apache.webapp.balancer.rules.AcceptEverythingRule: Redirect URL: http://jakarta.apache.org]]
08 Sep 2017 10:47:56 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
08 Sep 2017 10:47:56 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
08 Sep 2017 10:47:57 AM org.apache.tomcat.util.digester.Digester fatalError
SEVERE: Parse Fatal Error at line 42 column 2: The content of elements must consist of well-formed character data or markup.
org.xml.sax.SAXParseException: The content of elements must consist of well-formed character data or markup.
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.startOfMarkup(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
    at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1561)
    at org.apache.catalina.startup.ContextConfig.applicationWebConfig(ContextConfig.java:302)
    at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:959)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:249)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4020)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:909)
    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:872)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:474)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1106)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:310)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1019)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1011)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:440)
    at org.apache.catalina.core.StandardService.start(StandardService.java:450)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:683)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:537)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409)
08 Sep 2017 10:47:57 AM org.apache.catalina.startup.ContextConfig applicationWebConfig
SEVERE: Parse error in application web.xml
org.xml.sax.SAXParseException: The content of elements must consist of well-formed character data or markup.
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
    at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1561)
    at org.apache.catalina.startup.ContextConfig.applicationWebConfig(ContextConfig.java:302)
    at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:959)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:249)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4020)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:909)
    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:872)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:474)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1106)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:310)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1019)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1011)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:440)
    at org.apache.catalina.core.StandardService.start(StandardService.java:450)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:683)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:537)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409)
08 Sep 2017 10:47:57 AM org.apache.catalina.startup.ContextConfig applicationWebConfig
SEVERE: Occurred at line 42 column 2
08 Sep 2017 10:47:57 AM org.apache.catalina.startup.ContextConfig start
SEVERE: Marking this application unavailable due to previous error(s)
08 Sep 2017 10:47:57 AM org.apache.catalina.core.StandardContext start
SEVERE: Error getConfigured
08 Sep 2017 10:47:57 AM org.apache.catalina.core.StandardContext start
SEVERE: Context startup failed due to previous errors
08 Sep 2017 10:47:57 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
08 Sep 2017 10:47:57 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
08 Sep 2017 10:47:58 AM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
08 Sep 2017 10:47:58 AM org.apache.jk.common.ChannelSocket init
INFO: JK2: ajp13 listening on /0.0.0.0:8009
08 Sep 2017 10:47:58 AM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/152  config=null
08 Sep 2017 10:47:58 AM org.apache.catalina.storeconfig.StoreLoader load
INFO: Find registry server-registry.xml at classpath resource
08 Sep 2017 10:47:58 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 4765 ms
09 Sep 2017 10:44:16 AM org.apache.coyote.http11.Http11Protocol pause
INFO: Pausing Coyote HTTP/1.1 on http-8080
09 Sep 2017 10:44:18 AM org.apache.catalina.core.StandardService stop
INFO: Stopping service Catalina
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeRemoved('org.apache.catalina.jsp_classpath', '/C:/Program Files/Apache Software Foundation/Tomcat 5.5/webapps/servlets-examples/WEB-INF/classes/;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/shared/classes/;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/classes/;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/i18n/tomcat-i18n-en.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/i18n/tomcat-i18n-es.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/i18n/tomcat-i18n-fr.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/i18n/tomcat-i18n-ja.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/commons-el.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/jasper-compiler-jdt.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/jasper-compiler.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/jasper-runtime.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/jsp-api.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/naming-factory-dbcp.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/naming-factory.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/naming-resources.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/servlet-api.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Tomcat%205.5/bin/bootstrap.jar;/C:/Program%20Files/Java/jre6/lib/ext/dnsns.jar;/C:/Program%20Files/Java/jre6/lib/ext/localedata.jar;/C:/Program%20Files/Java/jre6/lib/ext/servlet-api.jar;/C:/Program%20Files/Java/jre6/lib/ext/sunjce_provider.jar;/C:/Program%20Files/Java/jre6/lib/ext/sunmscapi.jar;/C:/Program%20Files/Java/jre6/lib/ext/sunpkcs11.jar')
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeRemoved('org.apache.catalina.WELCOME_FILES', '[Ljava.lang.String;@257f1b')
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeRemoved('javax.servlet.context.tempdir', 'C:\Program Files\Apache Software Foundation\Tomcat 5.5\work\Catalina\localhost\servlets-examples')
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeRemoved('org.apache.catalina.resources', 'org.apache.naming.resources.ProxyDirContext@1bbdd48')
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeAdded('org.apache.catalina.WELCOME_FILES', '[Ljava.lang.String;@1d6fbb3')
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeReplaced('org.apache.catalina.WELCOME_FILES', '[Ljava.lang.String;@1d6fbb3')
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeReplaced('org.apache.catalina.WELCOME_FILES', '[Ljava.lang.String;@126d3df')
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextDestroyed()
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextDestroyed()
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeRemoved('org.apache.catalina.jsp_classpath', '/C:/Program Files/Apache Software Foundation/Tomcat 5.5/webapps/jsp-examples/WEB-INF/classes/;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/webapps/jsp-examples/WEB-INF/lib/jstl.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/webapps/jsp-examples/WEB-INF/lib/standard.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/shared/classes/;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/classes/;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/i18n/tomcat-i18n-en.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/i18n/tomcat-i18n-es.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/i18n/tomcat-i18n-fr.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/i18n/tomcat-i18n-ja.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/commons-el.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/jasper-compiler-jdt.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/jasper-compiler.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/jasper-runtime.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/jsp-api.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/naming-factory-dbcp.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/naming-factory.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/naming-resources.jar;/C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib/servlet-api.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Tomcat%205.5/bin/bootstrap.jar;/C:/Program%20Files/Java/jre6/lib/ext/dnsns.jar;/C:/Program%20Files/Java/jre6/lib/ext/localedata.jar;/C:/Program%20Files/Java/jre6/lib/ext/servlet-api.jar;/C:/Program%20Files/Java/jre6/lib/ext/sunjce_provider.jar;/C:/Program%20Files/Java/jre6/lib/ext/sunmscapi.jar;/C:/Program%20Files/Java/jre6/lib/ext/sunpkcs11.jar')
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeRemoved('org.apache.catalina.WELCOME_FILES', '[Ljava.lang.String;@c5aa00')
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeRemoved('javax.servlet.context.tempdir', 'C:\Program Files\Apache Software Foundation\Tomcat 5.5\work\Catalina\localhost\jsp-examples')
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeRemoved('org.apache.catalina.resources', 'org.apache.naming.resources.ProxyDirContext@11c0d60')
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeAdded('org.apache.catalina.WELCOME_FILES', '[Ljava.lang.String;@136d9d8')
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeReplaced('org.apache.catalina.WELCOME_FILES', '[Ljava.lang.String;@136d9d8')
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeReplaced('org.apache.catalina.WELCOME_FILES', '[Ljava.lang.String;@1827d1')
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextDestroyed()
09 Sep 2017 10:44:18 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextDestroyed()
09 Sep 2017 10:44:18 AM org.apache.coyote.http11.Http11Protocol destroy
INFO: Stopping Coyote HTTP/1.1 on http-8080

共有1个答案

隆兴修
2023-03-14

好了，伙计们，我解决了这个问题：

错误日志实际上显示web.xml文件的第42行有一个错误。我检查了这一行，在开头发现了一个非常愚蠢的错误--注释开始标记不正确。在错误的地方搜索了将近3个星期，因为我从来没有想过要检查这样的东西。

尽管如此，还是要感谢每一个回复的人，这是非常感谢的！

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