I'm trying to migrate a Spring Boot project from Kotlin 1.2.71 to 1.3.0. When I update the Kotlin version, the application context fails to load with the following stack trace:
[...] Caused by: java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'universityController' method public final com.vindedu.api.view.university.UniversityApplicationOverview com.vindedu.api.controller.UniversityController.getApplications(org.springframework.security.core.userdetails.UserDetails,boolean) to {[/uni/applications],methods=[GET]}: There is already 'universityController' bean method public static com.vindedu.api.view.university.UniversityApplicationOverview com.vindedu.api.controller.UniversityController.getApplications$default(com.vindedu.api.controller.UniversityController,org.springframework.security.core.userdetails.UserDetails,boolean,int,java.lang.Object) mapped. at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping$MappingRegistry.assertUniqueMethodMapping(AbstractHandlerMethodMapping.java:576) at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping$MappingRegistry.register(AbstractHandlerMethodMapping.java:540) at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.registerHandlerMethod(AbstractHandlerMethodMapping.java:264) at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.detectHandlerMethods(AbstractHandlerMethodMapping.java:250) at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.initHandlerMethods(AbstractHandlerMethodMapping.java:214) at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.afterPropertiesSet(AbstractHandlerMethodMapping.java:184) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.afterPropertiesSet(RequestMappingHandlerMapping.java:127) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624) ... 98 more The following functions in my UniversityController class map to /uni/applications/...:
@ApiOperation("Get applications received from students", tags = ["University API"], authorizations = [Authorization(value = "basicAuth")]) @RequestMapping(method = [RequestMethod.GET], path = ["/uni/applications"]) fun getApplications(@AuthenticationPrincipal user: UserDetails, @RequestParam("visible") visible: Boolean = true): UniversityApplicationOverview { return universityMessagingService.getApplications(user, visible) } @ApiOperation("Toggle application visibility for university", tags = ["University API"], authorizations = [Authorization(value = "basicAuth")]) @RequestMapping(method = [RequestMethod.PUT], path = ["/uni/applications/{id}/visible"]) fun toggleApplicationVisibility(@AuthenticationPrincipal user: UserDetails, @PathVariable id: Long): UniversityApplicationDetails { return universityMessagingService.toggleApplicationVisibility(user, id) } @ApiOperation("Get application received from student", tags = ["University API"], authorizations = [Authorization(value = "basicAuth")]) @RequestMapping(method = [RequestMethod.GET], path = ["/uni/applications/{id}"]) fun getApplication(@AuthenticationPrincipal user: UserDetails, @PathVariable id: Long): UniversityApplicationDetails { return universityMessagingService.getApplication(user, id) } @ApiOperation("Update application status", tags = ["University API"], authorizations = [Authorization(value = "basicAuth")]) @RequestMapping(method = [RequestMethod.PUT], path = ["/uni/applications/{id}/status"]) fun updateApplicationStatus(@AuthenticationPrincipal user: UserDetails, @PathVariable id: Long, @Valid @RequestBody updatedStatus: ApplicationStatusUpdate): UniversityApplicationDetails { return universityMessagingService.updateApplicationStatus(user, id, updatedStatus) } When I deleted my mappings listed above, I saw the same stack trace at runtime for another controller.
This project runs flawless with Kotlin 1.2.71. I appreciate any suggestions very much to make it work with Kotlin 1.3.0! My full build.gradle is listed below.
Please note:
I compile and run this project with the following JDK:
java version "11" 2018-09-25 Java(TM) SE Runtime Environment 18.9 (build 11+28) Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11+28, mixed mode)I can't update Spring Boot yet, due to classes in the project that depend on Spring Boot 1.x.
build.gradle:
buildscript { ext.kotlin_version = '1.3.0' // Was '1.2.71' ext.spring_boot_version = '1.5.4.RELEASE' repositories { jcenter() } dependencies { classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" // Required for Kotlin integration classpath "org.jetbrains.kotlin:kotlin-allopen:$kotlin_version" classpath "org.jetbrains.kotlin:kotlin-noarg:$kotlin_version" classpath "org.springframework.boot:spring-boot-gradle-plugin:$spring_boot_version" } } apply plugin: 'idea' apply plugin: 'kotlin' apply plugin: 'kotlin-allopen' apply plugin: 'kotlin-noarg' apply plugin: 'org.springframework.boot' apply plugin: 'application' allOpen { annotation("org.springframework.boot.autoconfigure.SpringBootApplication") annotation("org.springframework.stereotype.Service") annotation("org.springframework.context.annotation.Configuration") } noArg { annotation("javax.persistence.Entity") } jar { baseName = 'vindedu-api' version = '0.0.1' } repositories { jcenter() } dependencies { compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" // Required for Kotlin integration compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version" // Required for Kotlin integration compile 'com.fasterxml.jackson.module:jackson-module-kotlin:2.9.2' compile 'org.springframework.boot:spring-boot-starter-security' compile 'org.springframework.boot:spring-boot-starter-web' compile 'org.springframework.boot:spring-boot-starter-data-jpa' compile 'org.springframework.boot:spring-boot-starter-actuator' compile 'org.springframework.session:spring-session:1.3.1.RELEASE' compile 'io.springfox:springfox-swagger2:2.7.0' compile 'io.springfox:springfox-swagger-ui:2.7.0' compile 'org.postgresql:postgresql:42.1.4' compile 'org.flywaydb:flyway-core:4.2.0' // JAXB dependencies don't ship with the JDK anymore compile 'javax.xml.bind:jaxb-api:2.3.1' compile 'com.sun.xml.bind:jaxb-impl:2.3.1' compile 'javax.activation:activation:1.1.1' testCompile 'org.springframework.boot:spring-boot-starter-test' testCompile 'com.h2database:h2:1.4.196' } task wrapper(type: Wrapper) { gradleVersion = '4.10.2' } springBoot { mainClass = 'com.vindedu.api.ApplicationKt' } bootRun { systemProperty("PROP_NAME", "prop-value") } test { maxParallelForks = Runtime.runtime.availableProcessors() / 3 } 
