UnableToParseShibbolethIdPConfigurationFile

Unable to parse Shibboleth Identity Provider configuration file: java.lang.Exception: IdP configuration could not be loaded from FILENAME

Be sure to have the file:// prefix in the web.xml that specifies the path to the idp.xml configuration file, and NOT eg:

    <context-param>
        <param-name>IdPConfigFile</param-name>
        <param-value>/etc/shibboleth/etc/idp.xml</param-value>
    </context-param>

as that will raise the above Error. Instead try:

    <param-value>file:///etc/shibboleth/etc/idp.xml</param-value>