Assert.state throws an IllegalStateException which is appropriate here.

Assert.notNull throws an IllegalArgumentException which is inappropriate here, since the thing missing is not provided as an argument to the method in question.

Spring is rather consistent in that regard, when multiple properties could have been set and Spring later determines that the current state is illegal.

As for the exception message, "No XXX set" is also pretty standard across core Spring for missing properties; however, your proposal would provide more detailed information to the user and would align with the message in setBeanFactory.

So if you'd like to revert back to Assert.state, we'll consider the PR.

Cheers

Thanks for letting me know, I understand and the argument makes perfect sense. As I applied the suggested change, you see that I still like the more detailed exception message better.

This has been merged into master.

Thanks