A unofficial Giter8 template for gitbucket-plugin-template
sbt new jyuch/gitbucket-plugin-template.g8
Run sbt assembly and copy generated /target/scala-2.12/gitbucket-helloworld-plugin-assembly-1.0.0.jar to ~/.gitbucket/plugins/ (If the directory does not exist, create it by hand before copying the jar), or just run sbt install.
Then start GitBucket and access to http://localhost:8080/helloworld in your web browser, you will see Hello World! response.