Spring won. Why would anyone want to learn the standard aside from it being a standard that few people use? Spring itself is a wildly adopted standard. It is a semi open standard in that anyone can use it freely, but in that it's not supposed to be implemented by others.
The same is true for Micronaught or Quarkus. Learn the frameworks. But they are not a new open standard.
The same is true for Micronaught or Quarkus. Learn the frameworks. But they are not a new open standard.