A hybrid between monolith and microservices to take advantages of both.
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I've been working with my clients on microservies for several years and I feel the pain for Java EE developers to switch to microservice architecture. Almost everything they've learned in Java EE is anti-pattern in Microservices and it is a big paradigm shift. It would be easy for them to move step by step to fully adopt microservices.
For most companies, pure microservices might not be suitable as the infrastructure and management overhead is too high initially. For most of organizations, they don't need Internet scale and they are not in a size to adopt microservices before their application grows to the right size. For startup companies, it is wise to build something still monolithic but can be split up when the application grows bigger. Most companies won't even need Internet scale for the entire life cycle of their application so they can enjoy the smaller foot print as well as low supporting cost with all the benefits of microserivces architecture.
REST was introduced before Single Page Application on the browser and it is heavily rely on the URI schema for client/server communication. In URI, all query parameters and path parameters will be converted to string and then converted back to the right type based on swagger specification. This is very time consuming and make the swagger spec. so complicated.
By using Hybrid framework, you just need to define the JSON schema or other binary protocol IDL for your request and then validate the request again it. All the communication is based on JSON object or binary without data conversion on the server side.