Vineet Manohar's blog

This articles describes how to secure a Java web application in JBoss using BASIC authentication.

While parsing an XML file, I discovered that www.w3.org blocks requests to certain resources originating from the Java program, identified by the User-Agent. If your XML refers to w3.org DTDs, you might see an error like this: [java.io.IOException: Server returned HTTP response code: 500 for URL: http://www.w3.org/TR/xhtml1/DTD/xhtml-lat1.ent].

This is a known issue. The URLs have been deliberately blocked by w3.org due to ‘abusive’ use by Java programs.