spring-data-commons-2.0.0: 未找到 属性 类型 T 的删除！ ReactiveCrudRepository
spring-data-commons-2.0.0: No property delete found for type T! ReactiveCrudRepository
问题：通过扩展 ReactiveCrudRepository 尝试 spring web 反应以及 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$new[=12=](PropertyPath.java:82) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at java.util.Optional.orElseThrow(Optional.java:290) ~[na:1.8.0_101]
at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:82) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:304) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:284) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:243) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:211) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at org.springframework.data.repository.query.parser.Part.<init>(Part.java:81) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at org.springframework.data.repository.query.parser.PartTree$OrPart.lambda$new[=12=](PartTree.java:239) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at java.util.stream.ReferencePipeline.accept(ReferencePipeline.java:193) ~[na:1.8.0_101]
at java.util.stream.ReferencePipeline.accept(ReferencePipeline.java:175) ~[na:1.8.0_101]
at java.util.Spliterators$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[=12=](PartTree.java:368) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at java.util.stream.ReferencePipeline.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[=12=](RepositoryFactorySupport.java:410) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at java.util.stream.ReferencePipeline.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$UnmodifiableCollection.forEachRemaining(Collections.java:1049) ~[na:1.8.0_101]
at java.util.Spliterators$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$new(RepositoryFactorySupport.java:412) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at java.util.Optional.map(Optional.java:215) ~[na:1.8.0_101]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$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: Project Link
请建议这里的问题是什么以及如何解决它。
出现此错误是因为 ReactiveCrudRepository 不受 Spring Data JPA 支持。
根据这个Spring Data official blog bost (November 23, 2016)，目前只支持MongoDB，Cassandra和Redis：
Support for reactive data access
The most significant additions that made it into the milestone is the addition of support for reactive data access for selected stores. This means: reactive Spring Data repositories and templates for MongoDB, Cassandra and Redis.
根据 Mark Paluch 在 jira.spring.io 上的评论，JPA 将不受支持。
We won't provide reactive support for Spring Data JPA. Exposing a reactive API creates the expectation of being reactive but that's the exact opposite for JPA. JPA is blocking, requires a transaction context, that is bound to a thread and the whole JDBC backend follows a blocking approach as well. Providing a reactive API for relational databases could still make sense in a context of reactive/asynchronous database drivers.
这是另一个相关的 Whosebug 问题：ReactiveCrudRepository to use Hibernate in spring。
问题：通过扩展 ReactiveCrudRepository 尝试 spring web 反应以及 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$new[=12=](PropertyPath.java:82) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at java.util.Optional.orElseThrow(Optional.java:290) ~[na:1.8.0_101]
at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:82) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:304) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:284) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:243) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:211) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at org.springframework.data.repository.query.parser.Part.<init>(Part.java:81) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at org.springframework.data.repository.query.parser.PartTree$OrPart.lambda$new[=12=](PartTree.java:239) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at java.util.stream.ReferencePipeline.accept(ReferencePipeline.java:193) ~[na:1.8.0_101]
at java.util.stream.ReferencePipeline.accept(ReferencePipeline.java:175) ~[na:1.8.0_101]
at java.util.Spliterators$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[=12=](PartTree.java:368) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at java.util.stream.ReferencePipeline.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[=12=](RepositoryFactorySupport.java:410) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at java.util.stream.ReferencePipeline.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$UnmodifiableCollection.forEachRemaining(Collections.java:1049) ~[na:1.8.0_101]
at java.util.Spliterators$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$new(RepositoryFactorySupport.java:412) ~[spring-data-commons-2.0.0.BUILD-SNAPSHOT.jar:na]
at java.util.Optional.map(Optional.java:215) ~[na:1.8.0_101]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$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: Project Link
请建议这里的问题是什么以及如何解决它。
出现此错误是因为 ReactiveCrudRepository 不受 Spring Data JPA 支持。
根据这个Spring Data official blog bost (November 23, 2016)，目前只支持MongoDB，Cassandra和Redis：
Support for reactive data access
The most significant additions that made it into the milestone is the addition of support for reactive data access for selected stores. This means: reactive Spring Data repositories and templates for MongoDB, Cassandra and Redis.
根据 Mark Paluch 在 jira.spring.io 上的评论，JPA 将不受支持。
We won't provide reactive support for Spring Data JPA. Exposing a reactive API creates the expectation of being reactive but that's the exact opposite for JPA. JPA is blocking, requires a transaction context, that is bound to a thread and the whole JDBC backend follows a blocking approach as well. Providing a reactive API for relational databases could still make sense in a context of reactive/asynchronous database drivers.
这是另一个相关的 Whosebug 问题：ReactiveCrudRepository to use Hibernate in spring。