web.xml配置文件中<async-supported>true</async-supported>报错的解决方案

 在写web.xml的时候又一次总是报cvc-complex-type.2.4.a: Invalid content was found starting with element 错误，还出现小红叉，在网上找了很多，有说是把报红叉的代码写在<jsp-config></jsp-config>之间，试了之后发现完全没用。 

   后来在外文网站上找到了一个方法就把问题解决了 

解决方法一：

   在eclipse中配置xml

  1、 http://www.springmodules.org/schema/cache/springmodules-cache.xsd href="http://www.taobao.com/go/chn/tbk_channel/food.php?pid=mm_23960978_2582181_9547089&eventid=101865" target=_blank>
   2、http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd 
   然后再将这两个xsd加入到web.xml中就搞定了 ，如下面代码：

web.xml代码

<?xml version="1.0" encoding="UTF-8"?>  

<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"  

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance  http://www.springmodules.org/schema/cache/springmodules-cache.xsd http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd"    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
  http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">  

    <!--OS Work Flow -->  

    <display-name>OSWorkflow Example App</display-name>  

    <description>OSWorkflow Example App</description>  

  

  

  

    <servlet>  

        <servlet-name>SOAPWorkflow</servlet-name>  

        <servlet-class>  

            com.opensymphony.workflow.soap.SOAPWorkflowServlet  

        </servlet-class>  

    </servlet>  

    <servlet>  

        <description>  

            This is the description of my J2EE component  

        </description>  

        <display-name>  

            This is the display name of my J2EE component  

        </display-name>  

        <servlet-name>Osworkflow</servlet-name>  

        <servlet-class>net.caiban.servlet.Osworkflow</servlet-class>  

    </servlet>  

    <servlet>  

        <description>  

            This is the description of my J2EE component  

        </description>  

        <display-name>  

            This is the display name of my J2EE component  

        </display-name>  

        <servlet-name>DoWorkflow</servlet-name>  

        <servlet-class>net.caiban.servlet.DoWorkflow</servlet-class>  

    </servlet>  

    <servlet>  

        <description>  

            This is the description of my J2EE component  

        </description>  

        <display-name>  

            This is the display name of my J2EE component  

        </display-name>  

        <servlet-name>CreateWorkflow</servlet-name>  

        <servlet-class>net.caiban.servlet.CreateWorkflow</servlet-class>  

    </servlet>  

  

  

  

  

    <servlet-mapping>  

        <servlet-name>SOAPWorkflow</servlet-name>  

        <url-pattern>/soap/*</url-pattern>  

    </servlet-mapping>  

  

    <servlet-mapping>  

        <servlet-name>Osworkflow</servlet-name>  

        <url-pattern>/servlet/Osworkflow</url-pattern>  

    </servlet-mapping>  

    <servlet-mapping>  

        <servlet-name>DoWorkflow</servlet-name>  

        <url-pattern>/servlet/DoWorkflow</url-pattern>  

    </servlet-mapping>  

    <servlet-mapping>  

        <servlet-name>CreateWorkflow</servlet-name>  

        <url-pattern>/servlet/CreateWorkflow</url-pattern>  

    </servlet-mapping>  

  

    <welcome-file-list>  

        <welcome-file>default.jsp</welcome-file>  

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

    </welcome-file-list>  

    <resource-ref>  

        <res-ref-name>jdbc/oswf</res-ref-name>  

        <res-type>javax.sql.DataSource</res-type>  

        <init-param driverClassName="com.mysql.jdbc.Driver" />  

        <init-param url="jdbc:mysql://localhost:3306/osworkflow" />  

        <init-param user="root" />  

        <init-param password="123465" />  

        <init-param max-connections="20" />  

        <init-param max-idle-time="30" />  

    </resource-ref>  

    <!--OS Work Flow -->  

</web-app>  

解决方法二：

<async-supported>true</async-supported>是web.xml 3.0的新特性，只需将

<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_2_5.xsd" id="WebApp_ID" version="2.5">

改成：

<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" id="WebApp_ID" version="3.0">

即可解决。