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* GH-3432: Add MQTT v5 channel adapters Fixes https://github.com/spring-projects/spring-integration/issues/3432 * Add `optional` dependency for `org.eclipse.paho:org.eclipse.paho.mqttv5.client` * Add `MqttProtocolErrorEvent` and emit it from the `mqttErrorOccurred()` callback of the MQTT v5 client * Add `MqttHeaderMapper` since MQTT v5 has introduced user properties pair to transfer over the protocol * Add `Mqttv5PahoMessageHandler` as one more extension of the `AbstractMqttMessageHandler` * Add more convenient `MqttHeaders` constants for easier headers mapping configuration * Ensure via `Mqttv5BackToBackTests` that MQTT v5 is supported by the provided components * Change `pr-build-workflow.yml` to use `eclipse-mosquitto` container for testing all the MQTT interactions * Change `cyrilix/rabbitmq-mqtt` service to the `rabbitmq:management` since RabbitMQ does not support MQTT v5 * * Handle manual acks * Add `Mqttv5PahoMessageDrivenChannelAdapter.persistence` property * * Add documentation * Add `MosquittoContainerTest` for TestContainers support with Mosquitto image * Fix language in the docs after review Co-authored-by: Gary Russell <grussell@vmware.com> Co-authored-by: Gary Russell <grussell@vmware.com>
Spring Integration 
Code of Conduct
Please see our Code of conduct.
Reporting Security Vulnerabilities
Please see our Security policy.
Checking out and Building
To check out the project and build from the source, do the following:
git clone git://github.com/spring-projects/spring-integration.git
cd spring-integration
./gradlew clean test
or
./gradlew clean testAll
The latter runs additional tests (those annotated with @LongRunningIntegrationTest); it is a more thorough test but takes quite a lot longer to run.
The test results are captured in build/reports/tests/test (or .../testAll) under each module (in HTML format).
Add --continue to the command to perform a complete build, even if there are failing tests in some modules; otherwise the build will stop after the current module(s) being built are completed.
NOTE: While Spring Integration runs with Java SE 8 or higher, a Java 11 compiler is required to build the project.
To build and install jars into your local Maven cache:
./gradlew publishToMavenLocal
To build api Javadoc (results will be in build/api):
./gradlew api
To build the reference documentation (results will be in build/docs/asciidoc and build/docs/asciidocPdf):
./gradlew reference
To build complete distribution including -dist, -docs, and -schema zip files (results will be in build/distributions):
./gradlew dist
Using Eclipse or Spring Tool Suite (with BuildShip Plugin)
If you have the BuildShip plugin installed,
File -> Import -> Gradle -> Existing Gradle Project
Using Eclipse or Spring Tool Suite (when the BuildShip Plugin is not installed)
To generate Eclipse metadata (.classpath and .project files, etc), do the following:
./gradlew eclipse
Once complete, you may then import the projects into Eclipse as usual:
File -> Import -> General -> Existing projects into workspace
Browse to the 'spring-integration' root directory. All projects should import free of errors.
Using IntelliJ IDEA
To import the project into IntelliJ IDEA:
File -> Open... -> and select build.gradle from spring-integration project root directory
Guidelines
See also Contributor Guidelines.
Resources
For more information, please visit the Spring Integration website at: https://spring.io/projects/spring-integration