Irv Thomae wrote:
> In this, my first attempt to use the jaxb-1.0-beta package for a real
> application, I have been battling the
> UnmarshallException quoted above for two full days, bouncing back and
> forth between the "JAXB Users' Guide", another on-line tutorial, and
> countless variations on my code - until I'm cross-eyed. It's probably
> time to ask for help <g>.
>
> The XML files from which I need to read data look like this
> (I will use "..." to represent omitted repetition):<br>
> ==========================================================
> <?xml version="1.0" encoding="UTF-8"?>
>
> <bgpstats>
> <date>2002-11-21 15:59</date>
>
> <router name="63.209.255.229 (ATT-SD)">
> <adds>6</adds>
> <drops>1</drops>
> </router>
This data file is not valid in terms of the schema below.
"adds" and "drops" should be attributes of element <router>,
not children elements.
A valid router element is the following.
<router name="..." adds="6" drops="1"/>
>
> ... [many more "router" blocks] ...
>
> <as number="701">
> <routearounds>26</routearounds>
> <disconnects>2</disconnects>
> </as>
Same mistake here.
<as number="" routearounds="..." disconnects="..."/>
-Joe Fialli, Sun Microsystems
> .....[Many more "as" blocks]...
>
>
> </bgpstats>
> ====================================================
>
> Here is the entire schema file, called "BgpXml.xsd":
> ======================================================
> <?xml version="1.0" encoding="UTF-8"?>
> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
>
> <xsd:element name="bgpstats" type="BgpStatsType"/>
>
> <xsd:complexType name="BgpStatsType">
> <xsd:sequence>
> <xsd:element name="date" type="xsd:dateTime" minOccurs="1"
> maxOccurs="1"/>
> <xsd:element name="router" type="routerReport" minOccurs="1"/>
> <xsd:element name="AS" type="ASreport" minOccurs="0"/>
> </xsd:sequence>
> </xsd:complexType>
>
> <xsd:complexType name="routerReport">
> <xsd:attribute name="name" type="xsd:string" use="required"/>
> <xsd:attribute name="adds" type="xsd:integer"/>
> <xsd:attribute name="drops" type="xsd:integer"/>
> </xsd:complexType>
>
> <xsd:complexType name="ASreport">
> <xsd:attribute name="number" type="xsd:string" use="required"/>
> <xsd:attribute name="routearounds" type="xsd:integer"/>
> <xsd:attribute name="disconnects" type="xsd:integer"/>
> </xsd:complexType>
>
> </xsd:schema>
> =====================================================================
>
>
> This was compiled on a Linux system using the "xjc.sh" provided in the
> jaxb-1.0-beta package:
>
> xjc.sh -p BgpXml BgpXml.xsd
>
>
> As expected from reading the Users' Guide, this produced a group of .java
> files in directories BgpXml and BgpXml.impl , each declared a member of
> package
> "BgpXml".. They compiled without errors, using SDK1.3.1 (IBM's,
> actually.)
> The test program (heavily influenced by the Users' Guide samples) just
> tries
> to read a sample file (whose hard-coded name is "teststats.xml"):
>
> ====================BgpXmlReader.java===============================================
>
>
> import java.io.FileInputStream;
> import java.io.IOException;
> import java.util.Iterator;
> import java.util.List;
>
> import javax.xml.bind.JAXBContext;
> import javax.xml.bind.JAXBException;
> import javax.xml.bind.Unmarshaller;
> import javax.xml.bind.util.ValidationEventCollector;
>
> // import java content classes generated by the binding compiler
> import BgpXml.*;
> import BgpXml.impl.*;
>
> public class BgpXmlReader
> {
> public static void main( String[] args )
> {
> try {
> // create a JAXBContext capable of handling classes generated into
> // the BgpXml package
> JAXBContext jc = JAXBContext.newInstance( "BgpXml" );
>
> ValidationEventCollector vce = new ValidationEventCollector();
>
> // create an Unmarshaller
> Unmarshaller u = jc.createUnmarshaller();
> u.setEventHandler(vce);
>
> // unmarshal a BgpXml instance document into a tree of Java
> content
> // objects composed of classes from the primer.po package.
> Bgpstats stats =
> (Bgpstats)u.unmarshal( new FileInputStream(
> "teststats.xml" ) );
>
> // examine some of the content
> java.util.Calendar timestamp = stats.getDate();
> System.out.println( "Contents of Test File dated " +
> timestamp.toString());
>
> RouterReport report;
> ASReport ASr;
> int nRouters = 0;
> int nASrs = 0;
> while ( (report = stats.getRouter()) != null)
> {
> displayRouter(report);
> nRouters++;
> }
> System.out.println("Activity reported for " + nRouters + "
> routers.");
> /*
> while ( (ASr = stats.getAS()) != null)
> {
> displayAS(ASr);
> nASrs++;
> }
> System.out.println("Some avoidance activity reported for "
> +nASrs + " AS's.");
> */
> } catch( JAXBException je ) {
> je.printStackTrace();
> } catch( IOException ioe ) {
> ioe.printStackTrace();
> }
> }
>
> private static void displayRouter(RouterReport rpt)
> {
> System.out.println("\tFrom " + rpt.getName() + ':');
> System.out.println("\t\t" + (int)rpt.getAdds() + " adds, "
> + (int)rpt.getDrops() + " drops\n");
> }
>
> private static void displayAS(ASReport asr)
> {
> System.out.println("\tAS " + asr.getRoutearounds() + ",
> "+asr.getDisconnects() + " disconnects.");
> }
> }
> ========================================================================
>
> But this program doesn't get very far. Instead of the first System.out
> message, it throws an exception
> and quits:
>
> javax.xml.bind.UnmarshallException: Unexpected element {}:adds
>
> (I've omitted the stack trace here ...)
>
> Since the "adds" attribute is the first element defined for the complex
> element "router", this error message
> is bewildering to say the least. The example schema and code as
> presented here have both been "boiled down" considerably since the
> UnmarshallException was first seen, and many other variations have been
> tried too, but nothing I've tried has worked. **What** am I missing???
>
> Thanks,
> Irv Thomae
>
> (PS: I am aware that the method used to retrieve successive
> "RouterReport" objects will need corrections, but obviously we need to
> get past the unmarshalling problem first.)
--