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

[Ian Young (Jira)]

Ian Young ( https://shibboleth.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3Ae127cb03-43ed-473d-b6ba-592949cb4be8 ) *commented* on JSSH-27 ( https://shibboleth.atlassian.net/browse/JSSH-27?atlOrigin=eyJpIjoiY2Q1ZjI2ZGM1MjlkNDU1ODk5MzA5ZmRkZWFiNjhjYmUiLCJwIjoiaiJ9 )

Re: Implement an ensureId method to help with nullability annotation ( https://shibboleth.atlassian.net/browse/JSSH-27?atlOrigin=eyJpIjoiY2Q1ZjI2ZGM1MjlkNDU1ODk5MzA5ZmRkZWFiNjhjYmUiLCJwIjoiaiJ9 )

It was made protected intentionally so that things outside the class hierarchy could not use it, so that unless and until we decide we need it in the interface it isn't accidentally extending the API of every class.

(The final is for the compiler.)

( https://shibboleth.atlassian.net/browse/JSSH-27#add-comment?atlOrigin=eyJpIjoiY2Q1ZjI2ZGM1MjlkNDU1ODk5MzA5ZmRkZWFiNjhjYmUiLCJwIjoiaiJ9 ) Add Comment ( https://shibboleth.atlassian.net/browse/JSSH-27#add-comment?atlOrigin=eyJpIjoiY2Q1ZjI2ZGM1MjlkNDU1ODk5MzA5ZmRkZWFiNjhjYmUiLCJwIjoiaiJ9 )

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