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Communications
A standardized error format for HTTP responses
HTTP uses status codes to indicate the result of the servers attempt to satisfy the request. In case the server…
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Enterprise Java
HTTP – Content negotiation
With HTTP, resources are identified using URIs. And a uniquely identified resource might support multiple resource representations. A representation is…
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Core Java
Avoid leaking domain logic
Many software architectures try to separate domain logic from other parts of the application. To follow this practice we always…
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Enterprise Java
From layers to onions and hexagons
In this post we will explore the transition from a classic layered software architecture to a hexagonal architecture. The hexagonal…
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Enterprise Java
File down – and uploads in RESTful web services
Usually we use standard data exchange formats like JSON or XML with REST web services. However, many REST services have…
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Kotlin
Kotlin: Type conversion with adapters
In this post we will learn how we can use Kotlin extension functions to provide a simple and elegant type…
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Enterprise Java
Making POST and PATCH requests idempotent
In an earlier post about idempotency and safety of HTTP methods we learned that idempotency is a positive API feature.…
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Enterprise Java
Providing useful API error messages with Spring Boot
For API users it is quite important an API provides useful error messages. Otherwise, it can be hard to figure…
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Enterprise Java
Supporting bulk operations in REST APIs
Bulk (or batch) operations are used to perform an action on more than one resource in single request. This can…
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