DBref lazy falls back to eager in case of no default constructor [DATAMONGO-1402]

[spring-projects-issues]

Paul Sterl opened DATAMONGO-1402 and commented

During the fix of the wrong validation using DBRef I discovered that apparently lazy will silently converted to eager if no default no-arg constructor could be found.

This can easily be reproduced using by pull request:
#350

And remove the default constructor from the Address class --> unit test will fail as I added an assert to ensure the LazyProxy is used.

I would suggest to check some other cases too to make sure it works in the most default cases

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Affects: 1.8.4 (Gosling SR4)