Re: DocumentBuilder.parse(file);

[Vadim Gritsenko]

Matthew Oatham wrote:

Hi,

I have a problem - when I try to parse an XML file using 
DocumentBuilder.parse(file) whilst NOT connected to the internet I get 
the following exception

java.net.UnknownHostException: java.sun.com
       at org.apache.crimson.parser.Parser2.fatal(Parser2.java:3182)
       at 
org.apache.crimson.parser.Parser2.externalParameterEntity(Parser2.java:2870) 

       at 
org.apache.crimson.parser.Parser2.maybeDoctypeDecl(Parser2.java:1167)
       at 
org.apache.crimson.parser.Parser2.parseInternal(Parser2.java:489)
       at org.apache.crimson.parser.Parser2.parse(Parser2.java:305)
       at 
org.apache.crimson.parser.XMLReaderImpl.parse(XMLReaderImpl.java:442)
       at 
org.apache.crimson.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:185) 

       at 
javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:197)
       at 
com.assethouse.tools.doclets.ejb.EJBDeploymentDescriptorDoclet.replaceNode(Unknown 
Source)

I guess the DocumentBuilder is trying to look up the DTD - I can solve 
this by referencing the DTD from the file system but this means users 
have to download the DTD - not very elligant. Is there a way to stop 
the DocumentBuilder form trying to look up the DTD or do the 
validation part. So I can avoid this exception id the user doesn't 
have an internet connection 


What you are looking for is called entity resolution using catalogs. 
There is a page describing how to use entity resolver in Cocoon:
   http://cocoon.apache.org/2.1/userdocs/concepts/catalog.html

How to use entity resolver in whatever you are using (crimson?) -- you 
can get an answer on this if you email appropriate mailing list 
(xerces-users, I guess).

Regards,
Vadim


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