java.lang.StackOverflowError when parsing capabilities extended with ISO 19139 
-------------------------------------------------------------------------------

                 Key: GEOT-3239
                 URL: http://jira.codehaus.org/browse/GEOT-3239
             Project: GeoTools
          Issue Type: Bug
          Components: core xml
    Affects Versions: 2.7-M2
         Environment: Java 1.5
            Reporter: Angelo Quaglia
            Priority: Blocker
             Fix For: 2.7-M2
         Attachments: INSPIREVS.xsd, WMSServer.xml

GeoTools appears to stumble upon the circular inclusion between 
../gmd/referenceSystem.xsd and ../gmd/citation.xsd
In SchemaHandler.java the method compress( URI thisURI ) is being invoked until 
a java.lang.StackOverflowError happens.  
We are testing the inclusion of INSPIRE ISO 19139 metadata into WMS 1.3 
capabilities
I have included the sample schema and the sample capabilities.
Please note that the sample capabilities file is validated by Altova XMLSpy

This problem is a show stopper for us and we (JRC) are already working to 
replace GeoTools with a home made solution.

Testcase: 
testParse(eu.inspire.geoportal.viewclient.cache.engine.CacheParserTest):        
Caused an ERROR
null
java.lang.StackOverflowError
        at java.util.Hashtable.get(Hashtable.java:334)
        at java.util.Properties.getProperty(Properties.java:932)
        at java.util.Properties.getProperty(Properties.java:951)
        at java.lang.System.getProperty(System.java:689)
        at sun.net.NetProperties.get(NetProperties.java:75)
        at sun.net.spi.DefaultProxySelector$3.run(DefaultProxySelector.java:218)
        at java.security.AccessController.doPrivileged(Native Method)
        at 
sun.net.spi.DefaultProxySelector.select(DefaultProxySelector.java:201)
        at 
sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:796)
        at 
sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:726)
        at 
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1049)
        at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown 
Source)
        at 
org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown 
Source)
        at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source)
        at javax.xml.parsers.SAXParser.parse(SAXParser.java:277)
        at 
org.geotools.xml.SchemaFactory.getRealInstance(SchemaFactory.java:278)
        at org.geotools.xml.SchemaFactory.getInstance(SchemaFactory.java:264)
        at 
org.geotools.xml.handlers.xsi.SchemaHandler.compress(SchemaHandler.java:384)
        at 
org.geotools.xml.handlers.xsi.RootHandler.getSchema(RootHandler.java:116)
        at org.geotools.xml.XSISAXHandler.getSchema(XSISAXHandler.java:256)
        at 
org.geotools.xml.SchemaFactory.getRealInstance(SchemaFactory.java:284)
        at org.geotools.xml.SchemaFactory.getInstance(SchemaFactory.java:264)
        at 
org.geotools.xml.handlers.xsi.SchemaHandler.compress(SchemaHandler.java:384)
        at 
org.geotools.xml.handlers.xsi.RootHandler.getSchema(RootHandler.java:116)
        at org.geotools.xml.XSISAXHandler.getSchema(XSISAXHandler.java:256)
        at 
org.geotools.xml.SchemaFactory.getRealInstance(SchemaFactory.java:284)
        at org.geotools.xml.SchemaFactory.getInstance(SchemaFactory.java:264)
        at 
org.geotools.xml.handlers.xsi.SchemaHandler.compress(SchemaHandler.java:384)
        at 
org.geotools.xml.handlers.xsi.RootHandler.getSchema(RootHandler.java:116)
        at org.geotools.xml.XSISAXHandler.getSchema(XSISAXHandler.java:256)
        at 
org.geotools.xml.SchemaFactory.getRealInstance(SchemaFactory.java:284)
        at org.geotools.xml.SchemaFactory.getInstance(SchemaFactory.java:264)
        at 
org.geotools.xml.handlers.xsi.SchemaHandler.compress(SchemaHandler.java:384)
        at 
org.geotools.xml.handlers.xsi.RootHandler.getSchema(RootHandler.java:116)
        at org.geotools.xml.XSISAXHandler.getSchema(XSISAXHandler.java:256)
        at 
org.geotools.xml.SchemaFactory.getRealInstance(SchemaFactory.java:284)
        at org.geotools.xml.SchemaFactory.getInstance(SchemaFactory.java:264)
        at 
org.geotools.xml.handlers.xsi.SchemaHandler.compress(SchemaHandler.java:384)
        at 
org.geotools.xml.handlers.xsi.RootHandler.getSchema(RootHandler.java:116)
        at org.geotools.xml.XSISAXHandler.getSchema(XSISAXHandler.java:256)
        at 
org.geotools.xml.SchemaFactory.getRealInstance(SchemaFactory.java:284)
        at org.geotools.xml.SchemaFactory.getInstance(SchemaFactory.java:264)
        at 
org.geotools.xml.handlers.xsi.SchemaHandler.compress(SchemaHandler.java:384)
        at 
org.geotools.xml.handlers.xsi.RootHandler.getSchema(RootHandler.java:116)
        at org.geotools.xml.XSISAXHandler.getSchema(XSISAXHandler.java:256)
        at 
org.geotools.xml.SchemaFactory.getRealInstance(SchemaFactory.java:284)
        at org.geotools.xml.SchemaFactory.getInstance(SchemaFactory.java:264)
        at 
org.geotools.xml.handlers.xsi.SchemaHandler.compress(SchemaHandler.java:384)
...

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