The haystack-java library provides a java implementation of the haystack data model. It also includes a haystack 3.0 compliant client, and reference server.
The project is built with Gradle. It makes uses of the gradle wrapper so that you don't have to actually install Gradle yourself. You should use the gradlew script to run all gradle tasks for this project.
After cloning the repository, run the following command to build and test the library.
./gradlew build (Unix)
./gradlew.bat build (Windows)
It is highly recommended to enable the gradle daemon so builds go faster.