Among many reasons I think one is that it has a poor amount of open libraries/frameworks when you stack it up against other languages. The culture is much more DIY so there isn't a lot to help you get started with a new application.
I've never been a Java dev, but as I understand the package manager story is/was really bad. I've always wondered if that's part of the reason why you see so few open source efforts compared to other languages.
I've never been a Java dev, but as I understand the package manager story is/was really bad. I've always wondered if that's part of the reason why you see so few open source efforts compared to other languages.