OpenSAML user discussion

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Hi, we have to read and modify an SAMLResponse.

//read SAMLResponse 
from a string
Response response = (Response) responseUnmarsh.unmarshall
(XMLUtils.parse("<samlp:Response>...</samlp:Response>").
getDocumentElement());

//modify SAMLResponse
response.setInResponseTo
("...");

//Recreate SAMLResponse
new ResponseMarshaller().marshall
(response);

//Now, we have to computing the Signature Value
Signature 
signature = response.getSignature();
Signer.signObject(signature);


But, Signer.signObject throws this exception

Original Exception was 
java.security.SignatureException: object not initialized for signature 
or verification
Where is the error?


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