OpenSAML user discussion

Hello,

I am testing sample SAML response xml file. My code:

package SAML;
import java.security.Security;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.math.BigInteger;
import java.util.List;
import org.opensaml.saml2.encryption.Decrypter;
import org.opensaml.saml2.core.Response;
import org.opensaml.saml2.core.Assertion;
import org.opensaml.xml.Configuration;
import org.opensaml.xml.ConfigurationException;
import org.opensaml.xml.XMLConfigurator;
import org.opensaml.DefaultBootstrap;
import org.opensaml.xml.parse.BasicParserPool;
import org.opensaml.xml.io.UnmarshallerFactory;
import org.opensaml.xml.io.Unmarshaller;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.opensaml.xml.Configuration;
import org.opensaml.xml.ConfigurationException;
import org.opensaml.xml.signature.KeyValue;
import org.opensaml.xml.signature.RSAKeyValue;
import org.opensaml.xml.signature.Signature;
import org.opensaml.xml.signature.SignatureValidator;
import org.opensaml.xml.util.Base64;

public class SAMLAuthenticator {
        
    private static String[] testConfigs = { "D:/SAML/saml-test-config.xml", };

        protected static void initializeXMLTooling(String[] providerConfigs)
            throws ConfigurationException {
        Class clazz = Configuration.class;
        XMLConfigurator configurator = new XMLConfigurator();

        for (String config : providerConfigs) {
            configurator.load(clazz.getResourceAsStream(config));
        }
    }

        public static void main(String args[]) throws Exception
        {

        DefaultBootstrap.bootstrap();
        initializeXMLTooling(testConfigs);

        BasicParserPool ppMgr = new BasicParserPool();
        ppMgr.setNamespaceAware(true);
                
                SAMLAuthenticator samlAuthenticator = new SAMLAuthenticator();
                String fileName = "D://SAML/sampleAssertion.xml";
                samlAuthenticator.authenticate(fileName);

        }

public String authenticate(String fileName) {
String ret = null;
try{
File file =new File(fileName);
BufferedInputStream in = new BufferedInputStream(new FileInputStream(file));

BasicParserPool pool = new BasicParserPool();
Document inCommonMDDoc = pool.parse(in);
Element metadataRoot = inCommonMDDoc.getDocumentElement();

System.out.println("metadataRoot: "+metadataRoot);
UnmarshallerFactory unmarshallerFactory = 
Configuration.getUnmarshallerFactory();
Unmarshaller unmarshaller = unmarshallerFactory.getUnmarshaller(metadataRoot);

Assertion samlAss = (Assertion) unmarshaller.unmarshall(metadataRoot);
Signature sig = samlAss.getSignature();

List<KeyValue> keyValueList = sig.getKeyInfo().getKeyValues();

if (keyValueList.size() > 1) {
                throw new Exception();
}

KeyValue val = (KeyValue) keyValueList.get(0);
RSAKeyValue rsaKey = val.getRSAKeyValue();
        
String modulus = rsaKey.getModulus().getValue();
String exponent = rsaKey.getExponent().getValue();
        
System.out.println("modulus: "+modulus);
System.out.println("exponent: "+exponent);

BigInteger mod = new BigInteger(Base64.decode(modulus));
BigInteger exp = new BigInteger(Base64.decode(exponent));

SelfSignVerficationKeyHolder credential = new SelfSignVerficationKeyHolder();
credential.setPublicKey(mod, exp);
        
SignatureValidator validator = new SignatureValidator(credential);
validator.validate(sig);

//Steps involved in processing a given incoming SAML 2.0 request;


}catch(Exception e){
System.out.println("Exception has occured: "+e);
e.printStackTrace();
}
return ret;
}
}


I keep getting error ERROR:  'UndeclaredPrefix: Cannot resolve 'xt:DEFAULT' 
as a QName: the prefix 'xt' is not declared.'

I have xerces and xalan in classpath. These are the same from the SAML jar.

Thanks in advance.

-Sonal