Script Must Not be Null or Empty

I’ve just started learning Spring / Spring Boot so I’m at that stage where I’m making all the stupid beginner mistakes. In the past I used to catalogue the problems I hit, especially when learning a new technology. A few people told me they found it really useful so I’ve decided to start again. This particular issue I ran up against didn’t take long to figure out but the message on the exception isn’t as clear as it could be so I thought it was worth documenting.

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