The guide offers a comprehensive tutorial on creating and deploying custom Docker images for a Java RESTful API using Spring Boot and Couchbase Server. It begins with the development of a custom Couchbase Docker image that includes a provisioning script to automatically configure resources and credentials upon deployment. The tutorial then shifts to building a Spring Boot application, explaining how to set up project properties, endpoints, and dependencies using Gradle. A Dockerfile is created to package the Java application into a Docker image, which is then deployed alongside the Couchbase image using Docker Compose. This approach allows the two applications to communicate effectively, providing a convenient solution for maintaining web applications. The guide also references previous articles for those interested in similar implementations with Node.js and offers resources for learning more about the Couchbase Java SDK.