How to mix Java and Kotlin within one Spring Boot Application

1import lombok.Data;
2 
3@Data
4public class JavaValueObject {
5 
6    private String value = "default";
7 
8}

1data class KotlinDataClass (
2 
3    var value : String = "default"
4 
5)

1@RestController
2public class MixedController {
3 
4    ...
5 
6    @RequestMapping(path = Binding.PATH_WITH_JAVA_MAPPING, method = RequestMethod.POST)
7     public JavaValueObject javaMappingEndpoint(final JavaValueObject input) {
8         ...
9     }
10 
11    @RequestMapping(path = Binding.PATH_WITH_KOTLIN_MAPPING, method = RequestMethod.POST)
12     public KotlinDataClass kotlinMappingEndpoint(final KotlinDataClass input) {
13         ...
14     }
15 
16}

1<dependency>
2    <groupId>org.jetbrains.kotlin</groupId>
3    <artifactId>kotlin-stdlib-jre8</artifactId>
4    <version>${kotlin.version}</version>
5</dependency>
6<dependency>
7    <groupId>com.fasterxml.jackson.module</groupId>
8    <artifactId>jackson-module-kotlin</artifactId>
9</dependency>

1<plugin>
2    <artifactId>kotlin-maven-plugin</artifactId>
3    <groupId>org.jetbrains.kotlin</groupId>
4    <version>${kotlin.version}</version>
5    <configuration>
6        <compilerPlugins>
7            <plugin>spring</plugin>
8        </compilerPlugins>
9        <jvmTarget>${java.version}</jvmTarget>
10    </configuration>
11    <executions>
12        <execution>
13            <id>compile</id>
14            <phase>compile</phase>
15            <goals>
16                <goal>compile</goal>
17            </goals>
18            <configuration>
19                <sourceDirs>
20                    <sourceDir>src/main/kotlin</sourceDir>
21                </sourceDirs>
22            </configuration>
23        </execution>
24        <execution>
25            <id>test-compile</id>
26            <phase>test-compile</phase>
27            <goals>
28                <goal>test-compile</goal>
29            </goals>
30        </execution>
31    </executions>
32    <dependencies>
33        <dependency>
34            <groupId>org.jetbrains.kotlin</groupId>
35            <artifactId>kotlin-maven-allopen</artifactId>
36            <version>${kotlin.version}</version>
37        </dependency>
38    </dependencies>
39</plugin>