OpenSAML user discussion

[Mike Klein <>]

    public static Response signResponse(Response response)
    {
        try
        {
            SignatureBuilder builder = new SignatureBuilder();
            SignatureImpl sig = builder.buildObject();
            SAMLObjectContentReference socr = new
SAMLObjectContentReference(response);
            sig.getContentReferences().add(socr);
            sig.setSigningKey(signingKey);
            response.setSignature(sig);
            Signer.signObject(sig);
             ...

However on last statement I am getting following:

2007-05-12 18:18:32,693 WARN  [Signer] Unable to compute signature,
Signature XMLObject does not have the XMLSignature created during
marshalling.
1225078 [http-0.0.0.0-8080-Processor2] WARN
org.opensaml.xml.signature.Signer  - Unable to compute signature,
Signature XMLObject does not have the XMLSignature created during
marshalling.
2007-05-12 18:18:32,850 ERROR [SignatureMarshaller] Unable to construct
signature Element {http://www.w3.org/2000/09/xmldsig#}Signature
org.apache.xml.security.signature.XMLSignatureException: The requested
algorithm null does not exist. Original Message was: null
Original Exception was java.lang.NullPointerException
    at
org.apache.xml.security.algorithms.SignatureAlgorithm.<init>(Unknown Source)