Autogenerate id in Cosmos DB from Spring Boot

The docs explain the behavior here: https://github.com/Azure/azure-sdk-for-java/tree/master/sdk/cosmos/azure-spring-data-cosmos#spring-data-annotations

public class GeneratedIdEntity {

    @Id
    @GeneratedValue
    private String id;
}

As mentioned, Cosmos uses UUIDs rather than an auto-increment long.

Use @Id @GeneratedValue private String id;