Drools yes, but Cucumber? Cucumber isn't a programming language, it's just a sequence of steps. There's no logic, iteration, calling, etc. There's substitution of table values into steps, but that's no more programming than a mail merge.
Tests end up needing logic, and so Cucumber ends up splitting the flow of a test between two files in different languages.
I should probably have complained about HTML templating that allows a template to call into functions (or have logic in it itself), that's a bigger and clearer example of the problem.
I think the underlying principle here is that the more powerful languages need to be outermost. Having a powerful language call into a weak language to do something that needs to happen safely works well. Having a weak language call into a powerful language just results in a worst of both worlds - all of the danger but less of the power.
