[TS-38628] [Teamscale Maven Plugin] Kotlin Migration

system-tests/cucumber-maven-tia/src/test/java/com/teamscale/tia/TiaMavenCucumberSystemTest.java

@@ -14,7 +14,7 @@
 import static org.junit.jupiter.api.Assertions.assertAll;
 
 /**
- * Runs several Maven projects' Surefire tests that have the agent attached and one of our JUnit run listeners enabled.
+ * Runs several Maven projects' Surefire tests that have the agent attached, and one of our JUnit run listeners enabled.
  * Checks that this produces a correct coverage report.
  */
 public class TiaMavenCucumberSystemTest {

teamscale-maven-plugin/pom.xml

@@ -21,7 +21,7 @@
     <licenses>
         <license>
             <name>The Apache License, Version 2.0</name>
-            <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
+            <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
         </license>
     </licenses>
 
@@ -59,6 +59,8 @@
           This prevents frequent updates of this file in the repository.
         -->
         <teamscale.agent.version>34.0.0</teamscale.agent.version>
+        <kotlin.version>2.1.0</kotlin.version>
+        <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
     </properties>
 
     <dependencies>
@@ -68,11 +70,23 @@
             <version>5.11.4</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-stdlib</artifactId>
+            <version>${kotlin.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-test-junit</artifactId>
+            <version>${kotlin.version}</version>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>com.teamscale</groupId>
             <artifactId>teamscale-jacoco-agent</artifactId>
             <version>${teamscale.agent.version}</version>
         </dependency>
+
         <dependency>
             <groupId>org.apache.maven</groupId>
             <artifactId>maven-plugin-api</artifactId>
@@ -91,6 +105,7 @@
             <version>3.9.9</version>
             <scope>provided</scope>
         </dependency>
+
         <dependency>
             <groupId>org.eclipse.jgit</groupId>
             <artifactId>org.eclipse.jgit</artifactId>
@@ -107,7 +122,6 @@
             <version>${teamscale.agent.version}</version>
             <scope>runtime</scope>
         </dependency>
-
     </dependencies>
 
     <build>
@@ -124,11 +138,58 @@
             </plugins>
         </pluginManagement>
         <plugins>
+            <plugin>
+                <groupId>org.jetbrains.kotlin</groupId>
+                <artifactId>kotlin-maven-plugin</artifactId>
+                <version>${kotlin.version}</version>
+                <executions>
+                    <execution>
+                        <id>compile</id>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                        <phase>process-sources</phase>
+                        <configuration>
+                            <sourceDirs>
+                                <source>src/main/kotlin</source>
+                            </sourceDirs>
+                        </configuration>
+                    </execution>
+                    <execution>
+                        <id>test-compile</id>
+                        <goals>
+                            <goal>test-compile</goal>
+                        </goals>
+                        <phase>test-compile</phase>
+                        <configuration>
+                            <sourceDirs>
+                                <source>src/test/kotlin</source>
+                            </sourceDirs>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-plugin-plugin</artifactId>
-                <version>3.15.1</version>
+                <version>3.6.4</version>
+                <configuration>
+                    <extractors>
+                        <extractor>kotlin</extractor>
+                    </extractors>
+                </configuration>
+                <dependencies>
+                    <dependency>
+                        <groupId>com.github.gantsign.maven.plugin-tools</groupId>
+                        <artifactId>kotlin-maven-plugin-tools</artifactId>
+                        <version>1.1.0</version>
+                    </dependency>
+                </dependencies>
                 <executions>
+                    <execution>
+                        <id>default-descriptor</id>
+                        <phase>process-classes</phase>
+                    </execution>
                     <execution>
                         <id>generate-helpmojo</id>
                         <goals>