报错：java.io.FileNotFoundException: ... /xwork-validator-1.0.3.dtd

提交数据时有如下报错：
//===========================日志=================================================
2010-10-5 0:24:48 com.opensymphony.xwork2.util.logging.commons.CommonsLogger error
严重: Caught exception while loading file com/eshop/user/action/UserAction-validation.xml
http://www.opensymphony.com/xwork/xwork-validator-1.0.3.dtd - Class: sun.net.www.protocol.http.HttpURLConnection
File: HttpURLConnection.java
Method: getInputStream
...
Caused by: java.io.FileNotFoundException: http://www.opensymphony.com/xwork/xwork-validator-1.0.3.dtd
...
2010-10-5 0:24:49 com.opensymphony.xwork2.util.logging.commons.CommonsLogger error
严重: Caught exception while loading file com/eshop/user/action/UserAction-regist-validation.xml
http://www.opensymphony.com/xwork/xwork-validator-1.0.3.dtd - Class: sun.net.www.protocol.http.HttpURLConnection
File: HttpURLConnection.java
Method: getInputStream
Line: 1241 - sun/net/www/protocol/http/HttpURLConnection.java:1241:-1
...
Caused by: java.io.FileNotFoundException: http://www.opensymphony.com/xwork/xwork-validator-1.0.3.dtd//===========================日志=================================================//
/WEB-INF/lib下的jar包如下(不限)：
xwork-2.1.2.jar
struts2-core-2.1.6.jar两个validation.xml文件头包含以下内容：
<!DOCTYPE xwork PUBLIC 
"-//OpenSymphony Group//XWork 1.0.3//EN" 
"http://www.opensymphony.com/xwork/xwork-validator-1.0.3.dtd" >不知道是何原因。