I've create an application with JHipster v4. When I make a request on port 8080 it is returning a blank page. If I use yarn start, and I make a request to 9000 port, it is answering correctly.
Any idea?
I had the same issue with JHipster application bringing up the blank page on port 8080 when ran with ./mvnw in dev mode. I was able to resolve this by running:
yarn install && yarn webpack:build
After it finishes, the application shows normally in dev mode on port 8080.
I had the same issue where on port 8080, it was returning nothing and on 9000 it gave correct page , after yarn install && yarn webpack:build I get correct page on both, I noticed that if I only run .mvnw, the application runs fine and I do not need to run "yarn start"
By default, yarn listens on port 9000 (webpack + browser sync) to hot reload frontend code and contents, maven or gradle listens on port 8080 to hot reload server code. You must run both in dev.
If you start making changes to the client side code without having yarn start running, nothing will be reflected as the changes are not compiled so you need to either run yarn webpack:build manually after changes or have yarn start running.
It's written in the README.md of the project you generated and is documented on JHipster web site.
You should run npm install then mvnw, and it will run good.
For me (using npm for the front-end), just running npm start before mvnw makes the front-end available on 8080.
On the other hand, running npm start after mvnw will bring a blank page on 8080.
来源：https://stackoverflow.com/questions/42062717/application-generated-with-jhipster-4-returning-blank-page-on-8080-but-not-on-9