在web.xml中添加一个servlet

我有一个名为DBServlet的servlet放在包DB中。我的xml代码是低于在web.xml中添加一个servlet

<?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> 
    <display-name>Lab4DWP</display-name> 
    <welcome-file-list> 
    <welcome-file>index.html</welcome-file> 
    <welcome-file>index.htm</welcome-file> 
    <welcome-file>index.jsp</welcome-file> 
    <welcome-file>default.html</welcome-file> 
    <welcome-file>default.htm</welcome-file> 
    <welcome-file>default.jsp</welcome-file> 
    </welcome-file-list> 
    <servlet> 
    <servlet-name>DB.DBServlet</servlet-name> 
    <servlet-class>DB.DBServlet</servlet-class> 
</servlet> 

<servlet-mapping> 
    <servlet-name>DB.DBervlet</servlet-name> 
    <url-pattern>/DB.DBServlet</url-pattern> 
</servlet-mapping> 
</web-app>

当我尝试运行它。控制台输出这样的：

SEVERE: A child container failed during start 
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/Lab4DWP]] 
    at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222) 
    at java.util.concurrent.FutureTask.get(FutureTask.java:83) 
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123) 
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) 
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) 
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) 
    at java.util.concurrent.FutureTask.run(FutureTask.java:138) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) 
    at java.lang.Thread.run(Thread.java:695) 
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/Lab4DWP]] 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
    ... 7 more 
Caused by: java.lang.IllegalArgumentException: Servlet mapping specifies an unknown servlet name DB.DBervlet 
    at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3241) 
    at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3220) 
    at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1367) 
    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1346) 
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878) 
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:376) 
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) 
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) 
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5322) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    ... 7 more 
10.02.2014 14:42:11 org.apache.catalina.core.ContainerBase startInternal 
SEVERE: A child container failed during start 
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]] 
    at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222) 
    at java.util.concurrent.FutureTask.get(FutureTask.java:83) 
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123) 
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    at org.apache.catalina.startup.Catalina.start(Catalina.java:691) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322) 
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:456) 
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]] 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) 
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) 
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) 
    at java.util.concurrent.FutureTask.run(FutureTask.java:138) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) 
    at java.lang.Thread.run(Thread.java:695) 
Caused by: org.apache.catalina.LifecycleException: A child container failed during start 
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1131) 
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    ... 7 more 
10.02.2014 14:42:11 org.apache.catalina.startup.Catalina start 
SEVERE: The required Server component failed to start so Tomcat is unable to start. 
org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8005]] 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
    at org.apache.catalina.startup.Catalina.start(Catalina.java:691) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322) 
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:456) 
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardService[Catalina]] 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    ... 7 more 
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]] 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    ... 9 more 
Caused by: org.apache.catalina.LifecycleException: A child container failed during start 
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1131) 
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    ... 11 more 
10.02.2014 14:42:11 org.apache.coyote.AbstractProtocol pause 
INFO: Pausing ProtocolHandler ["http-bio-8080"] 
10.02.2014 14:42:11 org.apache.coyote.AbstractProtocol pause 
INFO: Pausing ProtocolHandler ["ajp-bio-8009"] 
10.02.2014 14:42:11 org.apache.catalina.core.StandardService stopInternal 
INFO: Stopping service Catalina 
10.02.2014 14:42:11 org.apache.coyote.AbstractProtocol destroy 
INFO: Destroying ProtocolHandler ["http-bio-8080"] 
10.02.2014 14:42:11 org.apache.coyote.AbstractProtocol destroy 
INFO: Destroying ProtocolHandler ["ajp-bio-8009"]

我想我做错了与添加的servlet到web.xml，但例如，在我使用它就像我已经张贴。任何解决方案

来源

2014-02-10 Sergey Scopin

从您的xml中删除servlet配置，然后尝试再次启动tomcat以查明您的服务器的其他配置是否有问题。 –

您是否尝试过在名称中不使用点？ – aalku

尝试没有点，是的。 –

错字（缺少S）：

<servlet-name>DB.DBervlet</servlet-name>

在异常消息称：

Caused by: java.lang.IllegalArgumentException: Servlet mapping specifies an unknown servlet name DB.DBervlet

更改为：

<servlet-name>DB.DBServlet</servlet-name>

来源

2014-02-10 08:55:35 hmjd

好的。典型的“错误是可怕的”失明。给OP的建议：例外是你的朋友，仔细阅读。 – Gimby

你在映射servlet名称是错误的。它应该是DB.DBServlet，并且你写了DB.DBervlet。你指定的是缺少一个“S”。请再试一次。

另外，命名包时请避免使用大写字母。从你的配置看，DB就是包名。

来源

2014-02-10 08:56:37 Gyan

您尚未将包名称放在您的servlet名称之前。

<servlet> 
<description></description> 
<display-name>GetCascadParamServlet</display-name> 
<servlet-name>GetCascadParamServlet</servlet-name> 
<servlet-class>com.agileinfotech.bsviewer.servlet.GetCascadParamServlet</servlet-class> // this is package of where my servlet is created. 
</servlet> 

<servlet-mapping> 
    <servlet-name>GetCascadParamServlet</servlet-name> 
    <url-pattern>/GetCascadParamServlet</url-pattern> 
</servlet-mapping>

来源

2014-02-10 12:52:29

在web.xml中添加一个servlet

回答

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