Bean validation does not work on a coroutine controller

[sagacity]

Adding a @Validated annotation to a coroutine controller (neither for WebMVC nor Webflux).

I'm not sure if this is necessarily an issue with spring-kotlin-coroutine though, or with Spring's bean validation framework.

Partial stacktrace for WebMVC (created simply by adding @Validated to the test CoroutineController):

java.lang.ArrayIndexOutOfBoundsException: 2
	at java.util.Arrays$ArrayList.get(Arrays.java:3841) ~[na:1.8.0_181]
	at org.hibernate.validator.internal.metadata.aggregated.ParameterMetaData$Builder.build(ParameterMetaData.java:169) ~[hibernate-validator-6.0.12.Final.jar:6.0.12.Final]
	at org.hibernate.validator.internal.metadata.aggregated.ExecutableMetaData$Builder.findParameterMetaData(ExecutableMetaData.java:435) ~[hibernate-validator-6.0.12.Final.jar:6.0.12.Final]
	at org.hibernate.validator.internal.metadata.aggregated.ExecutableMetaData$Builder.build(ExecutableMetaData.java:388) ~[hibernate-validator-6.0.12.Final.jar:6.0.12.Final]
	at org.hibernate.validator.internal.metadata.aggregated.BeanMetaDataImpl$BuilderDelegate.build(BeanMetaDataImpl.java:788) ~[hibernate-validator-6.0.12.Final.jar:6.0.12.Final]
	at org.hibernate.validator.internal.metadata.aggregated.BeanMetaDataImpl$BeanMetaDataBuilder.build(BeanMetaDataImpl.java:648) ~[hibernate-validator-6.0.12.Final.jar:6.0.12.Final]
	at org.hibernate.validator.internal.metadata.BeanMetaDataManager.createBeanMetaData(BeanMetaDataManager.java:192) ~[hibernate-validator-6.0.12.Final.jar:6.0.12.Final]
	at org.hibernate.validator.internal.metadata.BeanMetaDataManager.lambda$getBeanMetaData$0(BeanMetaDataManager.java:160) ~[hibernate-validator-6.0.12.Final.jar:6.0.12.Final]
	at java.util.concurrent.ConcurrentMap.computeIfAbsent(ConcurrentMap.java:324) ~[na:1.8.0_181]
	at org.hibernate.validator.internal.metadata.BeanMetaDataManager.getBeanMetaData(BeanMetaDataManager.java:159) ~[hibernate-validator-6.0.12.Final.jar:6.0.12.Final]
	at org.hibernate.validator.internal.engine.ValidationContext$ValidationContextBuilder.forValidateParameters(ValidationContext.java:619) ~[hibernate-validator-6.0.12.Final.jar:6.0.12.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateParameters(ValidatorImpl.java:254) ~[hibernate-validator-6.0.12.Final.jar:6.0.12.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateParameters(ValidatorImpl.java:224) ~[hibernate-validator-6.0.12.Final.jar:6.0.12.Final]
	at org.springframework.validation.beanvalidation.MethodValidationInterceptor.invoke(MethodValidationInterceptor.java:97) ~[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.9.RELEASE.jar:5.0.9.RELEASE]
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688) ~[spring-aop-5.0.9.RELEASE.jar:5.0.9.RELEASE]
	at org.springframework.kotlin.experimental.coroutine.web.CoroutineController$$EnhancerBySpringCGLIB$$220f8cfd.delayedMultiply(<generated>) ~[classes/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:891) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

[FearlessHyena]

Having the same exact issue. Is there any workaround for this?

[sagacity]

I guess we'll just wait for Spring 5.2 to land.

[FearlessHyena]

I already tried with Spring Boot 2.2.0 M3 (which uses Spring 5.2) and the issue still exists. So I have some doubts on if Spring 5.2 will fix this on release

[sagacity]

@FearlessHyena perhaps you can report it on the Spring 5.2 issue tracker, though? There's still time :)

[FearlessHyena]

Good point. I should report there 👍