The prerequisites to install YAWP are:
The easiest way to install it is by using its Maven archetype. You may change the values of the groupId, artifactId and version variables:
mvn archetype:generate \
-DarchetypeGroupId=io.yawp \
-DarchetypeArtifactId=yawp \
-DarchetypeVersion=LATEST \
-DgroupId=yawpapp \
-DartifactId=yawpapp \
-Dversion=1.0-SNAPSHOT
After that, you can cd into the yawpapp folder and start the development server:
cd yawpapp
mvn yawp:devserver
Just point a web browser to http://localhost:8080/api to verify it.
Finally, if you want to deploy your API to Google App Engine, just follow this simple guide.