java.lang.IllegalArgumentException: 名为 [X] 和 [Y] 的 servlet 都映射到不允许的 url-pattern [/url] [英] java.lang.IllegalArgumentException: The servlets named [X] and [Y] are both mapped to the url-pattern [/url] which is not permitted

问题描述

我试图添加这个 servlet

I tried to add this servlet

package com.classmgt.servlet;

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

到我的 Eclipse 项目，通过编辑 web.xml 如下

to my Eclipse project, by editing the web.xml as below

<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，我得到了以下异常:

However, I got the following exception:

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.

I have tried adding metadata-complete="true" to web.xml, but it does not recognize the servlet anymore.

推荐答案

Caused by: java.lang.IllegalArgumentException: The servlets named[ControllerServlet] 和 [com.classmgt.servlet.ControllerServlet] 是都映射到 url-pattern [/ControllerServlet] 这不是允许

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

您似乎混合了基于 @WebServlet 注释和基于 web.xml 的配置.

It seems that you have mixed @WebServlet annotation based and web.xml based configuration.

我怀疑您是否使用创建 Servlet"向导创建了一个 Servlet，该向导使用 url-pattern 创建 web.xml 条目，然后添加了一个 @WebServlet 注释，该注释复制了您可能放入的任何内容web.xml.

I doubt that you created a Servlet using the "Create Servlet" wizard which creates web.xml entry with url-pattern and then , added a @WebServlet annotation which duplicates anything you may put in the web.xml.

您应该使用其中一个，而不是两者都使用.从 web.xml 中删除映射并继续使用 @WebServlet 注释.

You should use the one or the other, not both. Remove the mapping from web.xml and go ahead with using only the @WebServlet annotation.

阅读更多:Servlet 3.0 注释 和 我们的 Servlets wiki 页面.

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