To clean the code type:
./gradlew clean

To test the code type:
./gradlew test

To create the war archive type:
./gradlew libs

To create the complete distribution type:
./gradlew dists

You will find the distribution compressed under build/distributions/.

You can start the jetty application to start the servlet from source:
./gradlew jettyRun

If you using a windows system use gradlew.bat instead the unix script gradlew.