Clients

• https://github.com/IBM/cloudant-java-sdk - IBM Cloudant's Apache 2 licensed official client library for Java that is also compatible with Apache CouchDB.
• Couch Slacker - Spring Data integration for CouchDB, supporting native Spring Data repositories, query method, etc. Dependency is available on maven central so it is very easy to use...
• Ektorp - Ektorp is a persistence API that uses CouchDB as a storage engine. The goal of Ektorp is to combine JPA like functionality with the simplicity and flexibility that CouchDB provides.
• LightCouch - LightCouch aims at providing a simple API for communicating with CouchDB databases.
• CouchRepository - Spring Data repositories for CouchDB. Delegates internally to Ektorp or LightCouch.

Older, probably outdated Java clients:

• java-cloudant
• https://github.com/isterin/jrelax
• https://github.com/behrica/jcouchdb-1.1.0-1
• https://github.com/sig/DroidCouch/
• https://github.com/mbreese/couchdb4j