How to inject/add a signed SAML Assertion into a Response?

[o haya]

Hi,
I have an Assertion (named 'assertion') containing a signed SAML assertion that my code has constructed, and also, separately, a Response (org.opensaml.saml2.core.Response) object (named 'resp') that I created using:
        Response resp = (Response) Configuration.getBuilderFactory().getBuilder(Response.DEFAULT_ELEMENT_NAME).buildObject(Response.DEFAULT_ELEMENT_NAME);
How can I inject the Assertion into the Response?
Thanks,Jim
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