Question

我尝试添加此servlet

package com.classmgt.servlet;

@WebServlet("/ControllerServlet")
public class ControllerServlet extends HttpServlet {}

到我的Eclipse项目，编辑web.xml如下

<servlet>
    <description>Servlet to print out Hello World!</description>
    <display-name>ControllerServlet</display-name>
    <servlet-name>ControllerServlet</servlet-name>
    <servlet-class>com.classmgt.servlet.ControllerServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>ControllerServlet</servlet-name>
    <url-pattern>/ControllerServlet</url-pattern>
</servlet-mapping>

但是，我得到以下例外：

SEVERE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/ClassManagementSystem]]
    at java.util.concurrent.FutureTask$Sync.innerGet(Unknown Source)
    at java.util.concurrent.FutureTask.get(Unknown Source)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/ClassManagementSystem]]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
    ... 7 more
Caused by: java.lang.IllegalArgumentException: The servlets named [ControllerServlet] and [com.classmgt.servlet.ControllerServlet] are both mapped to the url-pattern [/ControllerServlet] which is not permitted
    at org.apache.catalina.deploy.WebXml.addServletMapping(WebXml.java:335)
    at org.apache.catalina.startup.ContextConfig.processAnnotationWebServlet(ContextConfig.java:2457)
    at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2139)
    at org.apache.catalina.startup.ContextConfig.processAnnotationsFile(ContextConfig.java:2100)
    at org.apache.catalina.startup.ContextConfig.processAnnotationsFile(ContextConfig.java:2093)
    at org.apache.catalina.startup.ContextConfig.processAnnotationsFile(ContextConfig.java:2093)
    at org.apache.catalina.startup.ContextConfig.processAnnotationsFile(ContextConfig.java:2093)
    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1300)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:369)
    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:5269)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    ... 7 more

我尝试将metadata-complete="true"添加到web.xml，但它不再识别servlet。

Answer 1

引起：java.lang.IllegalArgumentException：名为的servlet [ControllerServlet]和[com.classmgt.servlet.ControllerServlet]是两者都映射到url-pattern [/ ControllerServlet]，而不是允许

您似乎已经混合@WebServlet基于注释和基于web.xml的配置。

我怀疑您是使用“创建Servlet”向导创建了一个Servlet，该向导使用url-pattern创建web.xml条目，然后添加了@WebServlet注释，该注释会复制您在web.xml中放置的任何内容。

你应该使用其中一个，而不是两个。从web.xml中删除映射，然后仅使用@WebServlet注释。

了解详情：Servlet 3.0 Annotations和our Servlets wiki page。

Answer 2

只需从@WebServlet("/ControllerServlet")删除注释ControllerServlet，因为它已添加到web.xml。

Answer 3

java.lang.IllegalArgumentException: The servlets named...

我找到了这个原因，我在不同的包中创建了新的servlet（name ='syncro'）。我的servlet位于 syncro.SynchronizeServlet 中当我在部署描述符（web.xml）中添加有关此servlet的信息时，我发现错误： IllegalArgumentException

描述符部分不正确的示例：

<servlet>
    <description></description>
    <display-name>SynchronizeServlet</display-name>
    <servlet-name>SynchronizeServlet</servlet-name>
    <servlet-class>SynchronizeServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>SynchronizeServlet</servlet-name>
    <url-pattern>/SynchronizeServlet</url-pattern>
    <url-pattern>/SynServlet</url-pattern>
  </servlet-mapping>

当我为servlet添加正确的路径时 - 错误消失了。正确的desc如下：

<servlet>
    <description></description>
    <display-name>syncro.SynchronizeServlet</display-name>
    <servlet-name>syncro.SynchronizeServlet</servlet-name>
    <servlet-class>syncro.SynchronizeServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>syncro.SynchronizeServlet</servlet-name>
    <url-pattern>/SynchronizeServlet</url-pattern>
    <url-pattern>/SynServlet</url-pattern>
  </servlet-mapping>

==＆GT; 73！

Answer 4

对我有用的是“干净”。

我的问题是在重命名Servlet类时引起的。但是，原始.class文件保留在目标目录中（使用其Servlet注释）。看起来您已将ControllerServlet移动到一个包中。

Jetty似乎并不介意这些明显的重复，但Tomcat7给了你 '都映射到url-pattern'例外。

查看这是否导致您的问题的简单方法是查看WAR以查看旧类（在您的情况下是[ControllerServlet]和[com.classmgt.servlet.ControllerServlet]）是否都存在。< / p>

Answer 5

至于我，我将tom-cat版本添加到我的pom文件中并且有效

<properties>
    <tomcat.version>7.0.52</tomcat.version>
</properties>
<dependencies>

Answer 6

名为[Register]和[com.TeamWork.controller.Register]的servlet。都映射到网址模式[/ Register]，这是不允许的

遇到此错误，您必须从web.xml中删除servlet映射，而只需添加@WebServlet（“ / Register”）批注+ url

<servlet>
     <servlet-name>Register</servlet-name>
     <servlet-class>com.TeamWork.controller</servlet-class>
  </servlet>

然后将您的servlet类添加到顶部

@WebServlet("/Register")`
public class Register extends HttpServlet { }

可以正常工作

java.lang.IllegalArgumentException：名为[X]和[Y]的servlet都映射到不允许的url-pattern [/ url]

6 个答案: