Marketing to developers is tough business. We are typically highly skeptical of things, and tend to see through promotion efforts. We are also pretty aware of what our problems are and are (often) quick to decide whether some solution will actually work for us. We dislike changing our workflows and have a natural resistance to that, even when the "new way" may be a little better than what we have. If it isn't substantially better, we'll often stick with what we know. Muscle memory mixed with comfort is a beast after all.

My general advice is to just speak plainly and frankly about your project on forums where it could be helpful to people. Don't exaggerate and don't sugar coat as those will be seen through and likely called out. Be willing to take crticial feedback for what it's worth. Some people are grumpy assholes, but often you'll get useful data even from them.

For example a grumpy but helpful reply to your project might be "I don't want to adopt this new thing in my workflow and have it go abandoned/unmaintained on me." That's a genuine concern that many people have that you would need to address in order to get them interested.

I think HN and Reddit are actually great places to talk about your project. Also I would look at any Java forums, especially related to AI tooling. Just be prepared to explain in plain language why your tool is useful in a world with Copilot/Claude/Gemini/etc. (this is just general advice. In your post yesterday you did a good job so I don't mean this specifically for this case)