spring-boot-demo/kotlin/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>4.1.1</version>
    <relativePath/>
  </parent>

  <groupId>com.ankurm</groupId>
  <artifactId>kotlin</artifactId>
  <version>1.0.0</version>
  <name>kotlin</name>
  <description>Kotlin with Spring Boot 4.1: null safety/JSpecify interop, allopen/noarg, and coroutines in controllers</description>
  <packaging>jar</packaging>

  <properties>
    <java.version>25</java.version>
    <!-- Spring Boot 4.1.1's own managed version (spring-boot-dependencies POM), not the latest
         Kotlin GA (2.4.20 at time of writing): see the post for why that distinction matters. -->
    <kotlin.version>2.3.21</kotlin.version>
    <kotlin.compiler.jvmTarget>25</kotlin.compiler.jvmTarget>
    <kotlinx-coroutines.version>1.10.2</kotlinx-coroutines.version>
    <jackson-module-kotlin.version>2.22.3</jackson-module-kotlin.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-webmvc</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-validation</artifactId>
    </dependency>
    <dependency>
      <groupId>com.h2database</groupId>
      <artifactId>h2</artifactId>
      <scope>runtime</scope>
    </dependency>

    <dependency>
      <groupId>org.jetbrains.kotlin</groupId>
      <artifactId>kotlin-reflect</artifactId>
    </dependency>
    <dependency>
      <groupId>org.jetbrains.kotlin</groupId>
      <artifactId>kotlin-stdlib</artifactId>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.module</groupId>
      <artifactId>jackson-module-kotlin</artifactId>
      <version>${jackson-module-kotlin.version}</version>
    </dependency>

    <!-- Coroutines: needed on the classpath even under plain Tomcat/MVC; see the post
         for why suspend/Flow controller methods still go through this reactive bridge. -->
    <dependency>
      <groupId>org.jetbrains.kotlinx</groupId>
      <artifactId>kotlinx-coroutines-core</artifactId>
      <version>${kotlinx-coroutines.version}</version>
    </dependency>
    <dependency>
      <groupId>org.jetbrains.kotlinx</groupId>
      <artifactId>kotlinx-coroutines-reactor</artifactId>
      <version>${kotlinx-coroutines.version}</version>
    </dependency>

    <!-- JSpecify, explicitly, so the legacy/annotated Java interop demo compiles against the
         exact same annotations Spring Framework 7 itself uses. -->
    <dependency>
      <groupId>org.jspecify</groupId>
      <artifactId>jspecify</artifactId>
      <version>1.0.0</version>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.jetbrains.kotlin</groupId>
      <artifactId>kotlin-test-junit5</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <finalName>kotlin-demo</finalName>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
      <plugin>
        <groupId>org.jetbrains.kotlin</groupId>
        <artifactId>kotlin-maven-plugin</artifactId>
        <version>${kotlin.version}</version>
        <configuration>
          <args>
            <arg>-Xjsr305=strict</arg>
          </args>
          <compilerPlugins>
            <plugin>spring</plugin>
            <plugin>jpa</plugin>
          </compilerPlugins>
        </configuration>
        <executions>
          <execution>
            <id>compile</id>
            <phase>compile</phase>
            <goals><goal>compile</goal></goals>
            <configuration>
              <sourceDirs>
                <sourceDir>${project.basedir}/src/main/kotlin</sourceDir>
                <sourceDir>${project.basedir}/src/main/java</sourceDir>
              </sourceDirs>
            </configuration>
          </execution>
          <execution>
            <id>test-compile</id>
            <phase>test-compile</phase>
            <goals><goal>test-compile</goal></goals>
            <configuration>
              <sourceDirs>
                <sourceDir>${project.basedir}/src/test/kotlin</sourceDir>
              </sourceDirs>
            </configuration>
          </execution>
        </executions>
        <dependencies>
          <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-maven-allopen</artifactId>
            <version>${kotlin.version}</version>
          </dependency>
          <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-maven-noarg</artifactId>
            <version>${kotlin.version}</version>
          </dependency>
        </dependencies>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <executions>
          <execution>
            <id>default-compile</id>
            <phase>none</phase>
          </execution>
          <execution>
            <id>default-testCompile</id>
            <phase>none</phase>
          </execution>
          <execution>
            <id>java-compile</id>
            <phase>compile</phase>
            <goals><goal>compile</goal></goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

</project>