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Frameworks & Architecture in the Spring engineering team, OpenSource enthusiast, all things Java, DDD, REST, software architecture, drums & music

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Spring Open Source Engineering
Dresden, Germany
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www.odrotbohm.de
@odrotbohm.de
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@odrotbohm

odrotbohm / moduliths-vs-microservices.adoc

Last active June 22, 2025 10:09

Modulith & Microservice – A trade-off comparison

Modulith VS. Microservices

This document contains a tabular comparison of the Modulithic and Microservice Architecture approach under certain aspects. Many of them can be achieved or influenced in both styles, but to different degrees and using different means. No claims of exhaustiveness.

@odrotbohm

odrotbohm / restbucks-stereotypes.adoc

Last active April 19, 2025 23:51

Sample rendering of Spring RESTBucks stereotype structure

Spring Modulith / jMolecules Stereotype Tree

Legend

■しかく – Application
□しろいしかく – Module
○しろまる – Named Interface
⊙ – Stereotype

@odrotbohm

odrotbohm / index.html

Created January 10, 2024 12:40

<!DOCTYPE html>

<html html xmlns="http://www.w3.org/1999/xhtml"

xmlns:th="http://www.thymeleaf.org"

th:replace="~{layout :: layout(~{:: #content})}">

...

</div>

</body>

@odrotbohm

odrotbohm / module-integration-listener.md

Last active November 22, 2022 15:35

tl;dr

We would like to simplify the event-based module integration and make sure the default transactional setup is correct by introducing a custom @ModuleIntegrationListener annotation.

Context

Classic Spring applications use bean references and invocations to orchestrate functionality, even if the functionality triggered resides in different application modules. In those cases, the default approach to consistency is a transaction that spans the original business method and all transitive functionality:

@Service
@RequiredArgsConstructor

@odrotbohm

odrotbohm / hal-forms-suggestions.md

Created January 25, 2021 20:21

Suggestions for HAL FORMS

{
 "_links" : { ... },
 "name" : "...",
 "other-values" : [
 { ... }, ...
 ],
 "_templates" : {

@odrotbohm

odrotbohm / Sample.java

Created June 29, 2020 21:08

Jackson deserialization into a complex constructor

@SpringBootTest

@RequiredArgsConstructor

class Sample {

private final ObjectMapper jackson;

@Test

void deserializesThroughConstructor() throws Exception {

var result = jackson.readValue("{\"firstname\" : \"Dave\", \"lastname\" : \"Matthews\" }", SomeSample.class);

@odrotbohm

odrotbohm / JacksonInternationalizationUnitTests.java

Created February 13, 2020 13:43

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

* https://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software

@odrotbohm

odrotbohm / Jdk14BeanInfoFactory.java

Created January 17, 2020 16:43

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

* https://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software

@odrotbohm

odrotbohm / readme.adoc

Created August 8, 2019 20:57

Hibernate Enhancer problem on Java 11

Spring RESTBucks uses Hibernate’s bytecode enhancement to avoid runtime overhead in favor of a build time step. This works fine on JDK 8. However, if the project is built on JDK 11, starting it fails with:

Caused by: java.lang.IllegalAccessError: Update to non-static final field org.springsource.restbucks.payment.Payment.order attempted from a different method ($$_hibernate_write_order) than the initializer method <init>
	at org.springsource.restbucks.payment.Payment.$$_hibernate_write_order(Payment.java) ~[classes/:na]

@odrotbohm

odrotbohm / readme.adoc

Created July 1, 2019 09:57

Proposal – Leveraging hypermedia in Android clients

Hypermedia in Android clients

Context

When it comes to JVM based clients of REST / HTTP APIs, Android is the most dominant platform. There are a variety of HTTP client libraries available for Android, but none of them have dedicated support to work with hypermedia elements (like links and forms) or late binding of data. Using those elements is crucial to avoid strong coupling between client and server. See this presentation (slides, recording for details.

Idea

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