Document signedDoc = null;
	    
	    try {
	    	// Sign SOAP XML document
			signedDoc = sign.build(doc, crypto, secHeader);
		} catch (WSSecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	    
		// See duplicated xmlns
	    String docStr = org.apache.ws.security.util.XMLUtils.PrettyDocumentToString(signedDoc);
	    System.out.println("Bad signed document: " + docStr);
	    
	    WSSecurityEngineResult actionResult = null;
		// Verify signature and see that it's wrong because of excess xmlns
		try {
			List<WSSecurityEngineResult> results = secEngine.processSecurityHeader(doc, null, null, crypto);
			actionResult = WSSecurityUtil.fetchActionResult(results, WSConstants.SIGN);
		
		} catch (WSSecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

Caused by: javax.xml.crypto.MarshalException: unsupported SignatureMethod algorithm: http://www.w3.org/2001/04/xmldsig-more#gostr34102001-gostr3411

public class TestDubl {

	private static Crypto crypto = null;
	private static WSSecurityEngine secEngine = new WSSecurityEngine();
	
	/**
	 * @param args
	 * @throws Exception 
	 */
	public static void main(String[] args) throws Exception {

		// Initialize JCP
		com.sun.org.apache.xml.internal.security.Init.init();
		SpecUtility.initJCP();
		
		// Load CryptoPro XMLDSig service provider
		Provider provCryptoProRI = new ru.CryptoPro.JCPxml.dsig.internal.dom.XMLDSigRI();
		Security.addProvider(provCryptoProRI);
		
		// Override methods
		Security.getProvider("XMLDSig").put("XMLSignatureFactory.DOM", 
		        "ru.CryptoPro.JCPxml.dsig.internal.dom.DOMXMLSignatureFactory");
		Security.getProvider("XMLDSig").put("KeyInfoFactory.DOM", 
		        "ru.CryptoPro.JCPxml.dsig.internal.dom.DOMKeyInfoFactory");
		
		// Prepare SOAP message
		SOAPEnvelope unsignedEnvelope = SOAPUtility.getSOAPEnvelopeFromString(SOAPUtility.SOAPMSG);
		Document doc = unsignedEnvelope.getAsDocument();
	    WSSecHeader secHeader = new WSSecHeader();
	    secHeader.insertSecurityHeader(doc);
	    	 
	    // Create Merlin to execute cryptographic operations
	    Merlin merlin = new Merlin();
		merlin.setKeyStore(SpecUtility.loadKeyStore(SpecUtility.DEFAULT_STORETYPE, null, 
				SpecUtility.DEFAULT_PASSWORD));
		crypto = merlin;

		// Prepare object to sign SOAP message (alias, password, algorithm etc)
		WSSecSignature sign = new WSSecSignature();
		
		String pswrd = null;
		if (SpecUtility.DEFAULT_PASSWORD != null) {
			pswrd = new String(SpecUtility.DEFAULT_PASSWORD);
		}
		
		sign.setUserInfo(SpecUtility.DEFAULT_ALIAS, pswrd);
	    sign.setKeyIdentifierType(WSConstants.BST_DIRECT_REFERENCE);
	    sign.setSignatureAlgorithm(ru.CryptoPro.JCPxml.Consts.URI_GOST_SIGN);
	    sign.setDigestAlgo(ru.CryptoPro.JCPxml.Consts.URI_GOST_DIGEST);
	    
	    Document signedDoc = null;
	    
	    try {
	    	// Sign SOAP XML document
			signedDoc = sign.build(doc, crypto, secHeader);
		} catch (WSSecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	    
		// See duplicated xmlns
	    String docStr = org.apache.ws.security.util.XMLUtils.PrettyDocumentToString(signedDoc);
	    System.out.println("Bad signed document: " + docStr);
	    WSSecurityEngineResult actionResult = null;
		// Verify signature and see that it's wrong because of excess xmlns
		try {
			List<WSSecurityEngineResult> results = secEngine.processSecurityHeader(signedDoc, null, null, crypto);
			actionResult = WSSecurityUtil.fetchActionResult(results, WSConstants.SIGN);
		} catch (WSSecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		// Wrong document shows 'null'
		System.out.println("Verified: " + actionResult);
	}
}