扩展 Spring Data CoroutineCrudRepository 抛出 PropertyReferenceException

Question

在我的项目中，我有一个 Kotlin ( 1.3.72) Spring Boot( 2.3.3.RELEASE) JPA 支持的存储库，它工作得很好，Spring 应用程序上下文正常启动，项目通过了所有测试，等等：

@Repository
interface MappingRepository : CrudRepository<RoutingMapping, Long> {
    fun findByCompanyId(companyId: Long): RoutingMapping?
}

当我将其切换为像这样扩展org.springframework.data.repository.kotlin.CoroutineCrudRepository而不改变任何其他内容时：

@Repository
interface MappingRepository : CoroutineCrudRepository<RoutingMapping, Long> {
    fun findByCompanyId(companyId: Long): RoutingMapping?
}

Spring 应用程序上下文启动失败并抛出以下错误：

Caused by: org.springframework.data.mapping.PropertyReferenceException:
No property count found for type RoutingMapping!`

这是一个令人困惑的异常，因为RoutingMapping它是映射的@Entity。我不清楚我是否遗漏了一些东西@Entity，或者是否是我对如何使用的误解org.springframework.data.repository.kotlin.CoroutineCrudRepository。

---

Caused by: org.springframework.data.mapping.PropertyReferenceException: No property count found for type RoutingMapping!
    at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:94)
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:382)
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:358)
    at org.springframework.data.mapping.PropertyPath.lambda$from$0(PropertyPath.java:311)
    at java.base/java.util.concurrent.ConcurrentMap.computeIfAbsent(ConcurrentMap.java:330)
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:293)
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:276)
    at org.springframework.data.repository.query.parser.Part.<init>(Part.java:82)
    at org.springframework.data.repository.query.parser.PartTree$OrPart.lambda$new$0(PartTree.java:251)
    at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
    at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
    at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
    at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
    at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
    at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
    at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
    at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:252)
    at org.springframework.data.repository.query.parser.PartTree$Predicate.lambda$new$0(PartTree.java:381)
    at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
    at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
    at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
    at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
    at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
    at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
    at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
    at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:382)
    at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:94)
    at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:89)
    ... 137 more

Answer 1

count 是扩展 CoroutineCrudRepository 时需要实现的方法之一。我猜您还试图在您的实现类之一中返回此接口。因此，如果您添加它，那么其他方法将会失败，因为它是一个接口。相反，为了使这项工作正常进行，您可以再添加一个接口，无论您在何处尝试实现该接口，该接口都会在您的类中返回。因此，例如，我将有另一个名为 MappingMongoRepository 的接口，它具有与 MappingRepository 相同的抽象方法，并使用我的类中返回的 MappingMongoRepository 。