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Add Groovy Hello World sample implementation
* Add Groovy Hello World sample implementation This commit introduces a new Hello World sample specifically designed for Groovy developers. The sample demonstrates basic Spring Integration concepts using Groovy DSL and provides two runnable applications. Changes include: - Add `helloworld-groovy` project with Groovy DSL configuration - Implement HelloWorldApp and PollerApp examples - Configure Groovy dependencies and spring-integration-groovy module - Add runHelloWorldApp and runPollerApp Gradle tasks for execution - Update developer information in build.gradle POM configuration * Added tests to sample * basic tests fixed * Add SpringJUnitConfig to PollerConfigTest * Update PR per code review comments. * Remove dependencies that are picked up transitively * Update JUnit version * Add SpringJunitConfig to HelloWorldConfigTests
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‎basic/helloworld-groovy/README.md‎

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Hello World Sample
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==================
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This is the Groovy version of the helloworld Java sample using Groovy DSL. This sample project contains 2 basic sample applications:
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* Hello World
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* Poller Application
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## Hello World
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The Hello World application demonstrates a simple message flow represented by the diagram below:
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Message -> Channel -> ServiceActivator -> QueueChannel
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To run the sample simply execute **HelloWorldApp** in package **org.springframework.integration.samples.helloworld**.
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You can also execute that class using the [Gradle](https://www.gradle.org):
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$ gradlew :helloworld-groovy:runHelloWorldApp
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You should see the following output:
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INFO : org.springframework.integration.samples.helloworld.HelloWorldApp - ==> HelloWorldDemo: Hello World
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## Poller Application
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This simple application will print out the current system time twice every 20 seconds.
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More specifically, an **Inbound Channel Adapter** polls for the current system time 2 times every 20 seconds (20000 milliseconds). The resulting message contains as payload the time in milliseconds and the message is sent to a **Logging Channel Adapter**, which will print the time to the command prompt.
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To run the sample simply execute **PollerApp** in package **org.springframework.integration.samples.helloworld**.
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You can also execute that class using the [Gradle](https://www.gradle.org):
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$ gradlew :helloworld-groovy:runPollerApp
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You should see output like the following:
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[task-scheduler-1][org.springframework.integration.samples.helloworld] GenericMessage [payload=1763478785243, headers={id=8f93b18a-063a-5e9f-4708-2ed1d04a1566, timestamp=1763478785244}]
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[task-scheduler-1][org.springframework.integration.samples.helloworld] GenericMessage [payload=1763478785248, headers={id=aa37e9c4-95d1-538c-a6cd-d400bb1474bf, timestamp=1763478785248}]
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‎basic/helloworld-groovy/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
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<modelVersion>4.0.0</modelVersion>
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<groupId>org.springframework.integration.samples</groupId>
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<artifactId>helloworld-groovy</artifactId>
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<version>7.0.0</version>
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<url>https://github.com/spring-projects/spring-integration-samples</url>
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<organization>
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<name>Spring IO</name>
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<url>https://spring.io/projects/spring-integration</url>
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</organization>
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<licenses>
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<license>
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<name>Apache License, Version 2.0</name>
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<url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
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<distribution>repo</distribution>
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</license>
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</licenses>
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<developers>
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<developer>
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<id>artembilan</id>
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<name>Artem Bilan</name>
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<email>[email protected]</email>
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<roles>
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<role>project lead</role>
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</roles>
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</developer>
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<developer>
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<id>garyrussell</id>
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<name>Gary Russell</name>
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<email>[email protected]</email>
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<roles>
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<role>project lead emeritus</role>
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</roles>
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</developer>
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<developer>
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<id>markfisher</id>
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<name>Mark Fisher</name>
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<email>[email protected]</email>
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<roles>
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<role>project founder and lead emeritus</role>
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</roles>
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</developer>
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<developer>
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<id>cppwfs</id>
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<name>Glenn Renfro</name>
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<email>[email protected]</email>
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<roles>
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<role>project committer</role>
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</roles>
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</developer>
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</developers>
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<scm>
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<connection>scm:git:scm:git:git://github.com/spring-projects/spring-integration-samples.git</connection>
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<developerConnection>scm:git:scm:git:ssh://[email protected]:spring-projects/spring-integration-samples.git</developerConnection>
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<url>https://github.com/spring-projects/spring-integration-samples</url>
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</scm>
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<issueManagement>
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<system>GitHub</system>
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<url>https://github.com/spring-projects/spring-integration-samples/issues</url>
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</issueManagement>
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<dependencies>
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<dependency>
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<groupId>org.springframework.integration</groupId>
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<artifactId>spring-integration-core</artifactId>
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<scope>compile</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.integration</groupId>
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<artifactId>spring-integration-groovy</artifactId>
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<scope>compile</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.groovy</groupId>
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<artifactId>groovy</artifactId>
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<version>${groovy.version}</version>
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<scope>compile</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-core</artifactId>
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<version>${log4j.version}</version>
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<scope>compile</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-core-test</artifactId>
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<version>${log4j.version}</version> <!-- Replace with your Log4j 2 version -->
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.awaitility</groupId>
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<artifactId>awaitility</artifactId>
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<version>4.3.0</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>3.27.6</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.hamcrest</groupId>
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<artifactId>hamcrest-library</artifactId>
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<version>2.2</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.mockito</groupId>
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<artifactId>mockito-core</artifactId>
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<version>5.18.0</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.integration</groupId>
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<artifactId>spring-integration-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-engine</artifactId>
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<scope>runtime</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.platform</groupId>
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<artifactId>junit-platform-launcher</artifactId>
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<scope>runtime</scope>
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</dependency>
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</dependencies>
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<dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>org.junit</groupId>
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<artifactId>junit-bom</artifactId>
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<version>6.0.1</version>
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<scope>import</scope>
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<type>pom</type>
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</dependency>
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<dependency>
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<groupId>tools.jackson</groupId>
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<artifactId>jackson-bom</artifactId>
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<version>3.0.0-rc5</version>
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<scope>import</scope>
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<type>pom</type>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson</groupId>
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<artifactId>jackson-bom</artifactId>
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<version>2.19.1</version>
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<scope>import</scope>
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<type>pom</type>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-framework-bom</artifactId>
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<version>7.0.0-SNAPSHOT</version>
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<scope>import</scope>
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<type>pom</type>
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</dependency>
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<dependency>
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<groupId>org.springframework.integration</groupId>
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<artifactId>spring-integration-bom</artifactId>
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<version>7.0.0-SNAPSHOT</version>
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<scope>import</scope>
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<type>pom</type>
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</dependency>
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</dependencies>
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</dependencyManagement>
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<properties>
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<java.version>17</java.version>
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<groovy.version>4.0.24</groovy.version>
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<log4j.version>2.24.3</log4j.version>
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</properties>
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<build>
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<plugins>
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<plugin>
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<groupId>org.codehaus.gmavenplus</groupId>
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<artifactId>gmavenplus-plugin</artifactId>
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<version>4.0.1</version>
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<executions>
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<execution>
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<goals>
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<goal>addSources</goal>
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<goal>addTestSources</goal>
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<goal>compile</goal>
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<goal>compileTests</goal>
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</goals>
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</execution>
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</executions>
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<configuration>
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<sources>
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<source>
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<directory>${project.basedir}/src/main/groovy</directory>
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<includes>
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<include>**/*.groovy</include>
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</includes>
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</source>
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</sources>
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<testSources>
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<testSource>
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<directory>${project.basedir}/src/test/groovy</directory>
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<includes>
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<include>**/*.groovy</include>
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</includes>
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</testSource>
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</testSources>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.13.0</version>
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<configuration>
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<source>${java.version}</source>
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<target>${java.version}</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<repositories>
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<repository>
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<id>repo.spring.io.milestone</id>
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<name>Spring Framework Maven Milestone Repository</name>
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<url>https://repo.spring.io/milestone</url>
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</repository>
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<repository>
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<id>repo.spring.io.snapshot</id>
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<name>Spring Framework Maven Snapshot Repository</name>
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<url>https://repo.spring.io/snapshot</url>
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</repository>
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</repositories>
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</project>

‎basic/helloworld-groovy/src/main/groovy/org/springframework/integration/samples/helloworld/HelloService.groovy‎

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/*
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* Copyright 2025-present the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.integration.samples.helloworld
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/**
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* Simple POJO to be referenced from a Service Activator.
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*
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* @author Glenn Renfro
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*/
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class HelloService {
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String sayHello(String name) {
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"Hello $name"
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}
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}
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‎basic/helloworld-groovy/src/main/groovy/org/springframework/integration/samples/helloworld/HelloWorldApp.groovy‎

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/*
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* Copyright 2025-present the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.integration.samples.helloworld
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import org.apache.commons.logging.Log
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import org.apache.commons.logging.LogFactory
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import org.springframework.context.annotation.AnnotationConfigApplicationContext
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import org.springframework.messaging.MessageChannel
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import org.springframework.messaging.PollableChannel
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import org.springframework.messaging.support.GenericMessage
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/**
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* Demonstrates a basic Message Endpoint that simply prepends a greeting
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* ("Hello ") to an inbound String payload from a Message. This is a very
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* low-level example, using Message Channels directly for both input and
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* output. Notice that the output channel is a QueueChannel. It is
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* therefore a PollableChannel and its consumers must invoke receive() as
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* demonstrated below.
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* <p>
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* View the configuration using Groovy DSL in HelloWorldConfig.groovy.
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*
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* @author Glenn Renfro
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*/
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class HelloWorldApp {
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private static final Log logger = LogFactory.getLog(HelloWorldApp)
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static void main(String[] args) {
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def context = new AnnotationConfigApplicationContext(HelloWorldConfig)
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def inputChannel = context.getBean('inputChannel', MessageChannel)
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def outputChannel = context.getBean('outputChannel', PollableChannel)
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inputChannel.send(new GenericMessage<String>('World'))
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logger.info("==> HelloWorldDemo: ${outputChannel.receive(0).payload}")
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context.close()
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}
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}
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