1

问题：通过扩展 ReactiveCrudRepository 尝试使用 spring web 响应式和 spring 数据。我收到以下错误：

Caused by: org.springframework.data.mapping.PropertyReferenceException: No property delete found for type Product!
        at org.springframework.data.mapping.PropertyPath.lambda$new$0(PropertyPath.java:82) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
        at java.util.Optional.orElseThrow(Optional.java:290) ~[na:1.8.0_101]
        at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:82) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
        at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:304) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
        at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:284) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
        at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:243) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
        at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:211) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
        at org.springframework.data.repository.query.parser.Part.<init>(Part.java:81) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
        at org.springframework.data.repository.query.parser.PartTree$OrPart.lambda$new$0(PartTree.java:239) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[na:1.8.0_101]
        at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) ~[na:1.8.0_101]
        at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) ~[na:1.8.0_101]
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[na:1.8.0_101]
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[na:1.8.0_101]
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[na:1.8.0_101]
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_101]
        at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[na:1.8.0_101]
        at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:240) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
        at org.springframework.data.repository.query.parser.PartTree$Predicate.lambda$new$0(PartTree.java:368) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[na:1.8.0_101]
        at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) ~[na:1.8.0_101]
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[na:1.8.0_101]
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[na:1.8.0_101]
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[na:1.8.0_101]
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_101]
        at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[na:1.8.0_101]
        at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:369) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
        at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:92) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
        at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:67) ~[spring-data-jpa-2.0.0.BUILD-SNAPSHOT.jar:na]
        at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:103) ~[spring-data-jpa-2.0.0.BUILD-SNAPSHOT.jar:na]
        at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:214) ~[spring-data-jpa-2.0.0.BUILD-SNAPSHOT.jar:na]
        at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:77) ~[spring-data-jpa-2.0.0.BUILD-SNAPSHOT.jar:na]
        at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$null$0(RepositoryFactorySupport.java:410) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[na:1.8.0_101]
        at java.util.Iterator.forEachRemaining(Iterator.java:116) ~[na:1.8.0_101]
        at java.util.Collections$UnmodifiableCollection$1.forEachRemaining(Collections.java:1049) ~[na:1.8.0_101]
        at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[na:1.8.0_101]
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[na:1.8.0_101]
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[na:1.8.0_101]
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[na:1.8.0_101]
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_101]
        at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[na:1.8.0_101]
        at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$new$2(RepositoryFactorySupport.java:412) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
        at java.util.Optional.map(Optional.java:215) ~[na:1.8.0_101]
        at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:403) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]

代码：

产品：

@Entity
@Table(name="PRODUCT")
public class Product implements Serializable {


    @Id
    @GeneratedValue
    @Column(name="PRODUCT_ID")
    private Long productId;

    @Column(name="PRODUCT_NAME")
    private String productName;



}

产品存储库：

public interface ProductRepository extends ReactiveCrudRepository<Product, Long>{
}

pom.xml：

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.BUILD-SNAPSHOT</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webflux</artifactId>
        </dependency>

Github：项目链接

请提出这里的问题以及如何解决它。

4

1 回答 1

6

发生此错误是因为Spring Data JPAReactiveCrudRepository不支持。

根据这篇Spring Data 官方博客博斯特（2016 年 11 月 23 日），目前仅支持 MongoDB、Cassandra 和 Redis：

支持反应式数据访问

使其成为里程碑的最重要的新增功能是增加了对选定商店的响应式数据访问的支持。这意味着：用于MongoDB、Cassandra 和 Redis的响应式 Spring Data 存储库和模板。

根据 Mark Paluch 在jira.spring.io上的评论， JPA 将不受支持。

我们不会为 Spring Data JPA 提供响应式支持。公开反应式 API 会产生反应式的期望，但这与 JPA 完全相反。JPA 是阻塞的，需要一个事务上下文，它绑定到一个线程，整个 JDBC 后端也遵循阻塞方法。在反应式/异步数据库驱动程序的上下文中，为关系数据库提供反应式 API 仍然有意义。

这是另一个相关的 StackOverflow 问题：ReactiveCrudRepository to use Hibernate in spring。

于 2017-04-23T05:53:02.577 回答