CachedFileEntityResolver could throw the following exception:
Server returned HTTP response code: 503 for URL: http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd
To reproduce this error, just try the following snippet:
public static void main( String[] args ) throws Exception { new URL( "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" ).openStream(); }
It seems to be a recent change to the w3 servers, some other projects have this problem: https://bamboo.developer.atlassian.com/build/viewBuildResultsFailedTests.action;jsessionid=E232501DDF6CE20E5AB1ACF2A98C0D0D?buildKey=USGTRK-STABLE&buildNumber=73 http://www.nabble.com/Why-does-TestNodeWalker-keep-failing--to23995758.html
A workaround could be to use HttpClient.
One more reference: http://www.w3.org/blog/systeam/2008/02/08/w3c_s_excessive_dtd_traffic
Also error from Hudson https://grid.sonatype.org/ci/job/doxia/205/jdk=1.5,label=ubuntu/console
fixed in r784395
It seems to be a recent change to the w3 servers, some other projects have this problem:

https://bamboo.developer.atlassian.com/build/viewBuildResultsFailedTests.action;jsessionid=E232501DDF6CE20E5AB1ACF2A98C0D0D?buildKey=USGTRK-STABLE&buildNumber=73
http://www.nabble.com/Why-does-TestNodeWalker-keep-failing--to23995758.html
A workaround could be to use HttpClient.
One more reference:
http://www.w3.org/blog/systeam/2008/02/08/w3c_s_excessive_dtd_traffic