ERR-Auth/External- No conversation state found in session

[Surinaidu Majji]

Hi,

We are a facing problem to prepare a servlet to handle external
authentication.
Thread link:: Control-not-RET-to-ConsumerURL-Idp3-1-1
<http://shibboleth.1660669.n2.nabble.com/Control-not-RET-to-ConsumerURL-Idp3-1-1-td7616278.html>

As part of IdP 3.1.1 upgrade , we are using 'Auth/External' .Later we tap
the SAML Response at our registered ConsumerURL once Authentication is
successful

*Construction of principle is as follows::*

                             Principal principal = new
UsernamePrincipal(principleName);
Subject subj = new Subject();
subj.getPrincipals().add(principal);
request.setAttribute(ExternalAuthentication.PRINCIPAL_KEY, principal);
request.setAttribute(ExternalAuthentication.PRINCIPAL_NAME_KEY, key);
request.setAttribute(ExternalAuthentication.SUBJECT_KEY, subj);
                              String key ="";
* ExternalAuthentication.finishExternalAuthentication(key, request,
response);*

*Our **external-authn-config.XML construction *is as follows::

*---------------------------------*
*external-authn-config.XML-----------------------------------------*



*    <bean id="shibboleth.authn.External.externalAuthnPath"
class="java.lang.String"
c:_0="contextRelative:/ExternalLoginServlet?conversation=abc"
/>---------------------------------external-authn-config.XML-----------------------------------------*
But,
a) The control is not returning to our registered ConsumerURL from IdP
b) Error at the console :*  No conversation state found in session"*

Please suggest...
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