我在启动Tomcat服务器时遇到了麻烦，它曾经可以正常工作，但是我做错了事，现在它抛出了这个异常：

Caused by: java.lang.IllegalArgumentException: The main resource set specified [E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\workspace\j2eeapplication\target\j2eeapplication-0.0.1-SNAPSHOT] is not valid
    at org.apache.catalina.webresources.StandardRoot.startInternal(StandardRoot.java:643)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    ... 9 more

这是我的web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
        version="3.1">

        <display-name>J2EE Application Example</display-name>

        <welcome-file-list>
                <welcome-file>index.jsp</welcome-file>
        </welcome-file-list>

        <context-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>/WEB-INF/applicationContext.xml</param-value>
        </context-param>

        <context-param>
                <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
                <param-value>.xhtml</param-value>
        </context-param>

        <context-param>
                <param-name>facelets.DEVELOPMENT</param-name>
                <param-value>true</param-value>
        </context-param>

        <context-param>
                <param-name>javax.faces.FACELETS_REFRESH_PERIOD</param-name>
                <param-value>1</param-value>
        </context-param>

        <listener>
                <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
        </listener>

        <servlet>
                <servlet-name>Resources Servlet</servlet-name>
                <servlet-class>org.springframework.js.resource.ResourceServlet</servlet-class>
                <load-on-startup>0</load-on-startup>
        </servlet>

        <servlet-mapping>
                <servlet-name>Resources Servlet</servlet-name>
                <url-pattern>/resources/*</url-pattern>
        </servlet-mapping>

        <servlet>
                <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
                <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
                <init-param>
                        <param-name>contextConfigLocation</param-name>
                        <param-value></param-value>
                </init-param>
                <load-on-startup>1</load-on-startup>
        </servlet>

        <servlet-mapping>
                <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
                <url-pattern>/app/*</url-pattern>
        </servlet-mapping>

        <servlet>
                <servlet-name>Faces Servlet</servlet-name>
                <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
                <load-on-startup>1</load-on-startup>
        </servlet>

        <servlet-mapping>
                <servlet-name>Faces Servlet</servlet-name>
                <url-pattern>*.jsf</url-pattern>
        </servlet-mapping>

        <filter>
                <filter-name>charEncodingFilter</filter-name>
                <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
                <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
        </filter>

        <filter-mapping>
            <filter-name>charEncodingFilter</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>

</web-app>

我在论坛上查看了不同的解决方案，但没有任何效果。最终的选择是卸载tomcat并重新安装，因为我读到这可能有效。我在这里先向您的帮助表示感谢。