[JIRA] (JSSH-27) Implement an ensureId method to help with nullability annotation

[Rod Widdowson (Jira)]

Rod Widdowson ( https://shibboleth.atlassian.net/secure/ViewProfile.jspa?accountId=59fb32bbc24efb3c4ed3c977 ) *commented* on JSSH-27 ( https://shibboleth.atlassian.net/browse/JSSH-27?atlOrigin=eyJpIjoiM2Y2OTI4MzI1ZDNmNGE5YmFkYjIzZGEyZDUyOWM4YmQiLCJwIjoiaiJ9 )

Re: Implement an ensureId method to help with nullability annotation ( https://shibboleth.atlassian.net/browse/JSSH-27?atlOrigin=eyJpIjoiM2Y2OTI4MzI1ZDNmNGE5YmFkYjIzZGEyZDUyOWM4YmQiLCJwIjoiaiJ9 )

For instance

net.shibboleth.idp.saml.metadata.impl.MetadataResolverServiceGaugeSet.MetadataResolverServiceGaugeSet()

Has an example when it might be useful to have the ensureId on an interface but

* It would end up adding a null as a key to Map which is probably illegal
* I’m unconvinced that it is a good case (or even a case at all) for adding anything to any Interface

( https://shibboleth.atlassian.net/browse/JSSH-27#add-comment?atlOrigin=eyJpIjoiM2Y2OTI4MzI1ZDNmNGE5YmFkYjIzZGEyZDUyOWM4YmQiLCJwIjoiaiJ9 ) Add Comment ( https://shibboleth.atlassian.net/browse/JSSH-27#add-comment?atlOrigin=eyJpIjoiM2Y2OTI4MzI1ZDNmNGE5YmFkYjIzZGEyZDUyOWM4YmQiLCJwIjoiaiJ9 )

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