Are you connected to the internet? Sometimes this will happen if you're not connected 
to the internet.
I found the following answer in the archives:
http://www.mail-archive.com/struts-user@jakarta.apache.org/msg10824.html
  Hong Xing <[EMAIL PROTECTED]> wrote: Hi all,
When I start WebLogic6.1, I get these errors below. How to fix it?
Please help me!!!

register('-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN', 'zip:D:/bea/w
lserver6/./config/mydomain/applications/DefaultWebApp/WEB-INF/_tmp_war_myserver_
myserver_DefaultWebApp/WEB-INF/lib/1008298416638struts.jar#org/apache/struts/res
ources/web-app_2_3.dtd'
resolveEntity('-//Sun Microsystems, Inc.//DTD Web Application 1.2//EN', 'http://
java.sun.com/j2ee/dtds/web-app_2_2.dtd')
Not registered, use system identifier
<2001-12-14 上午10时53分40秒> <[WebAppServletContext(7561029,Defa
ultWebApp,/DefaultWebApp)] action: null
java.net.UnknownHostException: java.sun.com

Sincerely, Hong Xing 



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