JUnit、@ControllerAdvice 和 Kotlin 中缺少检查异常

Question

我在 Kotlin 中写了一个 validation advisor，它在验证失败时抛出 EntityValidationException：

@Aspect
@Named
class ValidationAdvisor
@Inject constructor(val validator: EntityValidator) {
    @Around(EVERY_SAVE_AND_UPDATE_TO_DATABASE)
    fun validate(point: ProceedingJoinPoint): Any {
        val result: List<ConstraintViolation<Any>> = validator.validate(getEntity(point))
        if (isEntityValid(result))
            return point.proceed()

        throw EntityValidationException(
            violationInfos = result as List<ConstraintViolationInfo>
        )
    }

    private fun getEntity(point: ProceedingJoinPoint): Any {
        return point.args[0]
    }

    private fun isEntityValid(result: List<ConstraintViolation<Any>>): Boolean {
        return result.isEmpty()
    }

    companion object {
        const val EVERY_SAVE_AND_UPDATE_TO_DATABASE = "execution(* beans.repositories.BaseRepository.save(..))"
    }
}

我有一个 JUnit 测试（我在 Kotlin 中编写了一些部分，在 Java 中编写了一些部分，以在现有的私人项目中学习 Kotlin），它检查是否抛出异常：

@Test(expected = EntityValidationException.class)
public void test_WhenNameIsNotPresent_ThenExceptionIsThrown() throws Exception {
    repository.save(/* entity to save */);
}

但后来我看到测试失败，因为它抛出 UndeclaredThrowableException instead of EntityValidationException. Next, I read that Kotlin does not have checked exception. I think not only me have this problem - I am pretty sure that way of handling exceptions with @ControllerAdvice in Spring and Java 当我们决定在生产项目中切换到 Kotlin 时也可能有问题 - 因为它依赖于抛出的 class，并且抛出UndeclaredThrowableException 剥夺了我们这种可能性。有没有办法绕过这种行为，以确保可以切换到 Kotlin 和 old Spring 处理异常的方式（以及 [=19 的单元测试=]) 会保持不变吗？预先感谢您的帮助。

P.S. Github 项目的回购可在此处获得：Playgroud for Kotlin, Spring Data etc..

P.S.2 堆栈跟踪：

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:237)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.lang.reflect.UndeclaredThrowableException
    at com.sun.proxy.$Proxy65.save(Unknown Source)
    at ActorValidationTest.test_WhenNameIsNotPresent_ThenExceptionIsThrown(ActorValidationTest.java:26)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.junit.runners.model.FrameworkMethod.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.ExpectException.evaluate(ExpectException.java:19)
    ... 26 more
Caused by: beans.validator.exceptions.EntityValidationException
    at beans.aop.validation.ValidationAdvisor.validate(ValidationAdvisor.kt:23)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:629)
    at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:618)
    at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
    ... 37 more

对我来说 EntityValidationException（我想被抛出）导致 UndeclaredThrowableException。 EntityValidationException科特林class代码：

package beans.validator.exceptions

import beans.validator.constraintViolation.ConstraintViolationInfo

class EntityValidationException (val violationInfos: List<ConstraintViolationInfo>) : Exception() {
}

P.S.3 这也没有用：

@Around(EVERY_SAVE_AND_UPDATE_TO_DATABASE)
@Throws(EntityValidationException::class)
fun validate(point: ProceedingJoinPoint): Any /* rest of code*/

P.S.4 也许问题是 @Aspect 是 @Around Spring 数据存储库？

companion object {
        const val EVERY_SAVE_AND_UPDATE_TO_DATABASE = "execution(* beans.repositories.BaseRepository.save(..))"
    }
....
@NoRepositoryBean
public interface BaseRepository<ENTITY, IDENTIFIER extends Serializable>
        extends JpaRepository<ENTITY, IDENTIFIER>, JpaSpecificationExecutor<ENTITY> {
}

Answer 1

您正在尝试使方法 save() 或您的存储库抛出它未声明的已检查异常。所以即使方面声明它，那也行不通。你需要让你的例外扩展 RuntimeException.

JUnit、@ControllerAdvice 和 Kotlin 中缺少检查异常

JUnit, @ControllerAdvice and lack of checked exceptions in Kotlin

java

spring

spring-aop

kotlin

kotlin-interop