OData is a standardized protocol for creating and consuming data-centric apis, building on HTTP and REST...
odata4j is a Java framework that implements the OData protocol for both consumers (client-side) and producers (server-side)...
Add odata4j-bundle-x.x.jar from distribution archive to your build path (or odata4j-nojpabundle-x.x.jar for a smaller bundle with no JPA support)