tomcat 5.5部署项目报错，关于Filter的错误。

tomcat 5.5不支持 Servlet2.5
你的web.xml的写法是Servlet 2.5的。
注意看你的文件头部：

<web-app version="2.5"  
xmlns="http://java.sun.com/xml/ns/javaee"  
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee  
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> 

在2.5版本的xsd里面：

 <xsd:sequence>
      <xsd:element name="filter-name"
  type="javaee:filter-nameType"/>
      <xsd:choice minOccurs="1" maxOccurs="unbounded">
<xsd:element name="url-pattern"
    type="javaee:url-patternType"/>
<xsd:element name="servlet-name"
    type="javaee:servlet-nameType"/>
      </xsd:choice>
      <xsd:element name="dispatcher"
  type="javaee:dispatcherType"
  minOccurs="0" maxOccurs="4"/>
    </xsd:sequence>

是这样的
而在2.4版本：
是这个：

  <xsd:complexType name="filter-mappingType">
    <xsd:annotation>
      <xsd:documentation>

Declaration of the filter mappings in this web
application is done by using filter-mappingType.
The container uses the filter-mapping
declarations to decide which filters to apply to a request,
and in what order. The container matches the request URI to
a Servlet in the normal way. To determine which filters to
apply it matches filter-mapping declarations either on
servlet-name, or on url-pattern for each filter-mapping
element, depending on which style is used. The order in
which filters are invoked is the order in which
filter-mapping declarations that match a request URI for a
servlet appear in the list of filter-mapping elements.The
filter-name value must be the value of the filter-name
sub-elements of one of the filter declarations in the
deployment descriptor.

      </xsd:documentation>
    </xsd:annotation>

    <xsd:sequence>
      <xsd:element name="filter-name"
     type="j2ee:filter-nameType"/>
      <xsd:choice>
 <xsd:element name="url-pattern"
       type="j2ee:url-patternType"/>
 <xsd:element name="servlet-name"
       type="j2ee:servlet-nameType"/>
      </xsd:choice>
      <xsd:element name="dispatcher"
     type="j2ee:dispatcherType"
     minOccurs="0" maxOccurs="4"/>
    </xsd:sequence>
    <xsd:attribute name="id" type="xsd:ID"/>
  </xsd:complexType>

区别在于 和