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Spring and Spring Boot

Spring is a framework and set of annotations for building REST APIs. Spring Boot provides the server chassis (or main() method) for hosting RESTful services in a server.

Spring is used in our client libraries to call REST APIs. Specifically it provides the org.springframework.web.client.RestTemplate class for formatting rest calls and parsing the responses.

See the OMRS REST Repository Connector for an example of the use of RestTemplate to implement calls to the Open Metadata Repository Services (OMRS) REST API.

On the server-side, Spring provides the annotations that define how a Java method is exposed as a REST API. This includes the URL of the call, and how the parameters and responses are mapped. A REST API is typically implemented as a single Java class where each method is a different operation on the REST API.

At the top of the Java class is a declaration of the URI that is common for all methods in the class. For example, this is the declaration used for the OMRS REST APIs

@RestController
@RequestMapping("/open-metadata/repository-services")

This URI follows the root URL of the server. So if the server was using https://localhost:9443, the methods are called using

https://localhost:9443/open-metadata/repository-services ...

Then for each method/operation, the rest of the URL is defined and mapped.

@GetMapping(path = "/metadata-collection-id")

public MetadataCollectionIdResponse getMetadataCollectionId()
{
   /*
    * ... implementation here
    */
}

See the OMRS Server-side REST implementation for the server-side annotations that process the REST calls from the OMRS REST Connector.

Spring Boot is used in the OMAG Server Chassis. It searches for all of the REST API definitions and starts them in a server.

For more information on Spring, see https://spring.io/.

License: CC BY 4.0, Copyright Contributors to the ODPi Egeria project.