* Initialize microservices-messaging Spring Boot project
Add initial project structure for microservices-messaging using Spring Boot. Includes Maven configuration with dependencies for Kafka, Lombok, and testing, as well as main application, test class, and application properties.
* Initialize microservices messaging pattern
1. Added initial project structure for demonstrating the microservices messaging pattern.
2. Introduced service stubs (OrderService, InventoryService, PaymentService, NotificationService), a Message and MessageBroker class, and a main App entry point.
3. Added README and logging configuration.
* Implement Message and MessageBroker classes
1. Added the Message class with unique ID, content, and timestamp fields, and a toString method.
2. Implemented the MessageBroker class to support topic-based publish-subscribe messaging, including subscriber management, message publishing, and logging.
* Implement messaging pattern for microservices
1. Added message handling logic to InventoryService, PaymentService, and NotificationService.
2. OrderService now publishes order events to a MessageBroker, and App demonstrates the messaging workflow. 3. Each service processes relevant order events and logs actions for demonstration purposes.
* Expand microservices messaging docs and add diagrams
1. Enhanced the README with detailed explanations, real-world examples, Java code samples, and references for the Microservices Messaging pattern.
2. Added flowchart and sequence diagram images to illustrate the pattern.
* Refactor to use Kafka for microservices messaging
1. Added Apache Kafka for asynchronous communication between services.
2. Added KafkaMessageProducer and KafkaMessageConsumer classes, updated service implementations and main application logic to use Kafka, and adjusted the Maven configuration to include Kafka and Jackson dependencies.
3. Updated and moved all classes to the com.iluwatar.messaging package, improved documentation, and updated diagrams to reflect the new architecture.
* Add unit tests and license headers to messaging module
1. Added comprehensive unit tests for App, InventoryService, KafkaMessageConsumer, KafkaMessageProducer, Message, NotificationService, OrderService, and PaymentService.
2. Added MIT license headers to all main source files and logback.xml.
3. Updated pom.xml to include JUnit Jupiter as a test dependency.
* Refactor and simplify service and Kafka test classes
1. Simplified unit tests for InventoryService, NotificationService, and PaymentService by removing null content tests and adding instantiation checks.
2. Refactored KafkaMessageConsumerTest and KafkaMessageProducerTest to avoid requiring a real Kafka instance, focusing on class structure and method existence instead of integration behavior.
* Add microservices-messaging module and run scripts
Introduce the microservices-messaging module and register it in the root pom.xml. Add docker-compose.yml to run a local Kafka (confluentinc/cp-kafka) with a healthcheck, plus run-app.ps1 and run-app.sh helper scripts that start Kafka if needed and then launch the application. Update the module README with usage instructions. Also remove a duplicated junit-jupiter-api test dependency from the module pom to rely on project defaults.
* microservices-messaging: code style and Lombok
Add Lombok as a provided dependency and apply formatting/refactoring across the microservices-messaging module. Changes include import reordering, Javadoc and logging formatting, consistent lambda/try/catch indentation, small Kafka consumer/producer refinements (Duration/Properties usage and callback formatting), Message class tweaks (@Getter, JSON ctor and toString formatting) and EOF/newline fixes. Unit tests were also reformatted for consistency. These are non-functional style and readability improvements; no behavior changes intended.
* Make Kafka producer/consumer testable
Refactor KafkaMessageProducer and KafkaMessageConsumer to depend on the Producer/Consumer interfaces and add constructors that accept mockable instances. Extract default producer/consumer creation into factory methods so tests can inject MockProducer/MockConsumer. Update tests across the microservices-messaging module to use MockProducer/MockConsumer, add more meaningful assertions, error/interrupt handling tests, and simplify AppTest. These changes improve unit testability and remove the need for a running Kafka instance while preserving runtime behavior.
* Format test Javadoc and reorder imports
Normalize Javadoc formatting and reorder static JUnit imports for consistency in messaging tests. Converted multi-line test Javadocs to single-line comments and adjusted import ordering in the following files:
- microservices-messaging/src/test/java/com/iluwatar/messaging/KafkaMessageConsumerTest.java
- microservices-messaging/src/test/java/com/iluwatar/messaging/KafkaMessageProducerTest.java
- microservices-messaging/src/test/java/com/iluwatar/messaging/OrderServiceTest.java
No functional changes.
* Add MIT headers and exclude .ps1 from license checks
Add MIT license headers to microservices-messaging/docker-compose.yml, run-app.ps1 and run-app.sh to ensure license text is present in these scripts. Update root pom.xml to exclude PowerShell (*.ps1) files from the license plugin checks so those files are not processed by the license rule.
* Add Kafka docker service to CI workflows
Bring up Kafka for tests in CI and PR workflows. Adds steps to run docker compose for microservices-messaging, poll Kafka readiness (up to 20 retries), and always tear down with docker compose down. Enables Maven tests that depend on Kafka. Affects .github/workflows/maven-ci.yml and .github/workflows/maven-pr-builder.yml.
* Use kafka-topics instead of kafka-topics.sh
Replace calls to kafka-topics.sh with kafka-topics in CI workflows and the Docker Compose healthcheck. Updated .github/workflows/maven-ci.yml, .github/workflows/maven-pr-builder.yml, and microservices-messaging/docker-compose.yml to use the kafka-topics binary for readiness checks and healthchecks. This prevents failures on images that expose the kafka-topics command without the .sh wrapper.
* Use docker compose --wait for Kafka startup
Replace the custom bash readiness loop with `docker compose ... up -d --wait` in CI and PR workflows. This simplifies startup of the microservices-messaging Kafka service and removes the manual retry/polling logic. Files changed: .github/workflows/maven-ci.yml, .github/workflows/maven-pr-builder.yml. Note: requires a Docker Compose version that supports the `--wait` flag.
* Reformat tests for readability
Reformatted KafkaMessageConsumerTest and PaymentServiceTest for readability and consistent formatting: reflowed constructor invocation, expanded anonymous HashMap and schedulePollTask lambda blocks, and aligned assertDoesNotThrow parameters. These are pure style changes with no behavioral modifications.
* Remove Kafka Docker Compose steps from CI
Removed the Start/Stop Kafka Docker Service steps that ran docker compose for microservices-messaging from .github/workflows/maven-ci.yml and .github/workflows/maven-pr-builder.yml. Workflows no longer start or tear down the Kafka docker-compose service during CI/PR runs; other steps (xvfb install, Maven build, Codecov upload, Sonar cache) remain unchanged.
* Bump google-java-format to 1.27.0; tidy tests
Update pom.xml to use google-java-format 1.27.0 (was 1.17.0). Make minor formatting cleanups in KafkaMessageConsumerTest and PaymentServiceTest by collapsing multi-line calls into single lines. No functional changes.
* Downgrade Google Java Format to 1.17.0
Update Spotless googleJavaFormat version in root pom.xml from 1.27.0 to 1.17.0
* Improve Kafka producer and consumer tests
Enhance microservices-messaging tests: add consumer tests to verify run() exits immediately when stopped and gracefully handles a WakeupException (ensuring the MockConsumer is closed). Update producer error test to avoid try-with-resources, assert publish behavior and history, trigger failingProducer.errorNext(...) before closing to cover the error callback branch, then close and assert the mock producer is closed.
* Refactor App.run and add messaging tests
Extract App.run(...) and introduce a package-private sleepMs field to control sleep durations so the demo can be exercised programmatically and sped up for tests. Main now delegates to run; consumers are started there. Tests updated: AppTest sets sleepMs to 0 and adds testRunWithMockObjects using MockProducer/MockConsumer to exercise run without a Kafka broker; KafkaMessageProducerTest adds a null-message publish test; minor formatting fix in KafkaMessageConsumerTest. These changes improve testability and coverage for the microservices-messaging module.
* Add Backends For Frontends pattern (#300)
Implements the BFF pattern with two client-specific gateways
(MobileBff, DesktopBff) aggregating shared downstream services
(AuthService, CartService, OrderService, SupplierService) into
client-tailored response shapes.
Closes#300
* Rename SupplierService lookup key to productName for clarity
The service is looked up by product name throughout the codebase, not
an actual product ID as the previous naming implied.
* Address review feedback: remove unnecessary compact constructors, add InMemory* service tests
Add an educational rule-engine module demonstrating the Rule Engine
pattern. Each business rule is an independent object exposing evaluate
(decision) and execute (action); a RuleEngine evaluates a collection of
rules against an immutable loan-application context in insertion order,
runs the passing rules, and reports every passed and failed rule via an
immutable RuleEngineResult. Includes three concrete rules, an App demo,
unit tests, README, and class diagram.
* fix: V-002 security vulnerability
Automated security fix generated by Orbis Security AI
* adding cross-platform support
* fixing sonarqube hotspots
* fixing the formating for java windows
* fix: address PR review comments - Windows title bug, Unix paths, and consistency
- Add empty string title arg to cmd /c start to fix paths-with-spaces bug
- Revert Unix commands to bare names (open, xdg-open) with NOSONAR since
xdg-open location varies by distro; absolute paths broke portability
- Apply same ProcessBuilder fix to page-object/src App.java for consistency
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* fix: resolve Windows path via SystemRoot env var instead of hardcoding
C:\Windows\System32\cmd.exe fails when Windows is installed on a
non-C drive. Use System.getenv("SystemRoot") with a C:\Windows
fallback to locate cmd.exe portably in both App.java files.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---------
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
* Update ved-asole link in .all-contributorsrc
Updated my profile link in .all-contributorsrc
* Update README.md with url for ved-asole profile
Update README.md with url for ved-asole profile
* feat: implement Immutable pattern #3448
Add immutable/ module with ImmutableUser (final class, defensive copy,
withAge wither method), App demo, JUnit 5 tests, PlantUML diagram, and
README following project conventions.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* feat: add withName and withRoles wither methods to ImmutableUser #3448
Every field now has a corresponding wither for consistency.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* fix: add junit-jupiter-api dependency to immutable module #3448
Required for @Test annotations and assert methods in test code.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---------
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
* Add STI tests
* test: add delta for floating-point comparison in VehicleServiceTest
* fix: guard teardown against nulls and use assertNotNull in VehicleServiceTest
Add null checks in @AfterEach tearDown() to prevent NullPointerException
if setUp() partially fails. Replace assertTrue(x != null) with assertNotNull(x).
* style: format code in SingleTableInheritanceTest and VehicleServiceTest for consistency
* docs: reformulate text, add links to further languages and paragraph about the book in central README.md
(#2275)
* docs: shorten text for link to payhip
(#2275)
* docs: reformulate german translation for Abstract Document
(#2275)
* Create folder for Abstract Factory
* Create README.md for Abstract Document
* Translate README.md for Abstract Document to German
* correct typo
* docs: add class diagrams for all patterns
(#2275)
* docs: add missing words in abstract-factory.README.md
(#2275)
* docs: Create German README.md for Active Object
#2275
first text part
* docs: finish German translation of README.md for Active Object
* docs: translate actor-model into German
#2295
* docs: add German translation for Acyclic Visitor
#2295
* correct typo
* docs: Translate Singleton into German
#2295
* docs: Translate Prototype into German
#2295
* Delete localization/de/Abstract Factory
* insert line break
* correct typos in actor-model
* realignment of java code block
* docs: translate Adapter Pattern into German
#2295
* Update README.md
change 'lizenz' to 'Lizenz' in badge
* Update README.md
translate 'benefits' and 'trade-offs'
* remove additional bullet point after line break
* correct indentation
* docs: translate Dependency Injection into German
#2295
* docs: translate Bridge into German
#2295
* correct typos
* docs: Translate Builder into German
* delete english text
* little changes in formulation
* Update README.md
change link to image
* docs: remove spanish files
(#2275)
* docs: remove non-translated patterns
(#2275)
* Create README.md
docs: Translate Step Builder into German
#2275
* Create README.md
docs: Translate Fluent Interface into German
#2275
* eager is eifrig, not gierig
* Translate Chain of Responsibility into German
#2275
