[Repast-developer] Xerces versions and problems.

[Mark R. D. <mdi...@la...>]

We keep encountering the following problem with RePast and trying to use 
Charts, I've been using a newer version of Xerces, I don't know if this 
is to blame. There appear to be issues with Xerces DTD validation 
feature attempting to resolve external ftp url's for some reason.

I personally would recommend using the JAXP interface over Xerces 
directly, the default configuration and validation behavior is more 
predictable through the JAXP interface with something like:

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = factory.newDocumentBuilder();
Document doc = docBuilder.parse(new File(file));

this frees you from the particular Xerces Implementation too. You can 
rely on the default parser implmentation included with the latest J2SDK 
(which I believe is actually Xerces right now) and not have to provide a 
copy of Xerces directly within your distribution.

-Mark

The exception:
         [java] Error loading persistent chart sizes and positions
         [java] java.net.UnknownHostException: C
         [java] 	at java.net.InetAddress.getAllByName0(InetAddress.java:571)
         [java] 	at java.net.InetAddress.getAllByName0(InetAddress.java:540)
         [java] 	at java.net.InetAddress.getByName(InetAddress.java:449)
         [java] 	at java.net.Socket.<init>(Socket.java:100)
         [java] 	at sun.net.NetworkClient.doConnect(NetworkClient.java:50)
         [java] 	at sun.net.NetworkClient.openServer(NetworkClient.java:38)
         [java] 	at sun.net.ftp.FtpClient.openServer(FtpClient.java:267)
         [java] 	at sun.net.ftp.FtpClient.<init>(FtpClient.java:381)
         [java] 	at sun.net.www.protocol.ftp.FtpURLConnection.connect
(FtpURLConnection.java:77)
         [java] 	at sun.net.www.protocol.ftp.FtpURLConnection.getInputStream
(FtpURLConnection.java:96)
         [java] 	at java.net.URL.openStream(URL.java:798)
         [java] 	at 
org.apache.xerces.impl.XMLEntityManager.startEntity(Unknown
Source)
         [java] 	at 
org.apache.xerces.impl.XMLEntityManager.startDocumentEntity
(Unknown Source)
         [java] 	at 
org.apache.xerces.impl.XMLDocumentScannerImpl.setInputSource
(Unknown Source)
         [java] 	at 
org.apache.xerces.parsers.DTDConfiguration.parse(Unknown
Source)
         [java] 	at 
org.apache.xerces.parsers.DTDConfiguration.parse(Unknown
Source)
         [java] 	at org.apache.xerces.parsers.XMLParser.parse(Unknown 
Source)
         [java] 	at org.apache.xerces.parsers.DOMParser.parse(Unknown 
Source)
         [java] 	at uchicago.src.sim.analysis.ChartArchiver.loadXML
(ChartArchiver.java:77)
         [java] 	at uchicago.src.sim.analysis.ChartArchiver.loadCharts
(ChartArchiver.java:67)
         [java] 	at uchicago.src.sim.engine.AbstractGUIController.setModel
(AbstractGUIController.java:165)
         [java] 	at uchicago.src.sim.engine.Controller.setModel
(Controller.java:146)