A) automatically generates repetitive Java code

B) useful for developers who streamline their workflow

=> What are the streamlinable workflows? (1) API testing; (2) data model layers; (3) API language bridges; (4) ...

Find complementary or competitive products for 1-4.

Find (where) people (who) complain about the product limitations

Prove to them your product does not have such limitations.

Along the way: learn about the problem and product space, decide if you care enough to make people happy (productize), ...

... or find something that's more interesting. You might e.g., find yourself more interested in showing people how to adopt AI than in how to generate Java.

Then you're showing the java-generation as proof point for a broader and arguably more valuable technology, and showing yourself as someone who can create value, for others who already have a market+product in mind.