一对多关系映射在 spring 反应式 web-flux 中未正确执行

Question

I am trying out a spring boot app using web-flux, and r2dbc for PostgreSQL, initially I could do few POST, GET, PUT, DELETE actions. However, when I tried to link customer table with subscription table, errors started to show up.

I am pasting these entity classes below here

package reactive_web_flux_example.reactive_web_flux_example.Entity;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import lombok.Data;
import org.springframework.data.annotation.Id;
import org.springframework.data.relational.core.mapping.Table;
import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;
@Table(value = "customer")
@Data
public class Customer {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long customerId;
    private String customerName;
    private String customerEmail;
    private String customerPhone;
    @OneToMany(fetch = FetchType.EAGER, mappedBy = "customer", cascade = CascadeType.ALL)
    @JsonIgnoreProperties("customer")
    private List<Subscription> subscriptionList = new ArrayList<>();
}

package reactive_web_flux_example.reactive_web_flux_example.Entity;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import lombok.Data;
import org.springframework.data.annotation.Id;
import org.springframework.data.relational.core.mapping.Table;
import javax.persistence.*;
@Table(value = "subscription")
@Data
public class Subscription {
      @Id
      @GeneratedValue(strategy = GenerationType.IDENTITY)
      private long subscriptionId;
      private String subscriptionName;
      @ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
      @JoinColumn(name = "customer_id", nullable = false)
      @JsonIgnoreProperties("customer")
      private Customer customer;
 }

I am also pasting my error logs which intellij has generated

 2021-12-31 13:37:10.358  INFO 18713 --- [           main]                r.r.ReactiveWebFluxExampleApplication    : No active profile set, falling back to default      profiles: default
 2021-12-31 13:37:11.131  INFO 18713 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data R2DBC repositories in DEFAULT mode.
 2021-12-31 13:37:11.278  INFO 18713 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 141 ms.   Found 2 R2DBC repository interfaces.
 2021-12-31 13:37:12.696  INFO 18713 --- [           main] o.s.b.web.embedded.netty.NettyWebServer  : Netty started on port 8080
 2021-12-31 13:37:12.709  INFO 18713 --- [           main] r.r.ReactiveWebFluxExampleApplication    : Started ReactiveWebFluxExampleApplication in 2.858 seconds (JVM running for 3.349)
  2021-12-31 13:37:20.071 ERROR 18713 --- [or-http-epoll-3] a.w.r.e.AbstractErrorWebExceptionHandler : [e12abe35-1]  500 Server Error for HTTP POST "/customer/save"

java.lang.IllegalArgumentException: Unsupported array type: reactive_web_flux_example.reactive_web_flux_example.Entity.Subscription
at    org.springframework.data.r2dbc.dialect.PostgresDialect$R2dbcArrayColumns.getArrayType(PostgresDialect.java:164) ~[spring-data-r2dbc-1.4.0.jar:1.4.0]
  Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
  Error has been observed at the following site(s):
*__checkpoint ⇢ Handler  reactive_web_flux_example.reactive_web_flux_example.Controller.customerController#addCustomer(CustomerRequestModel) [DispatcherHandler]
*__checkpoint ⇢ HTTP POST "/customer/save" [ExceptionHandlingWebHandler]
  Original Stack Trace:
    at   org.springframework.data.r2dbc.dialect.PostgresDialect$R2dbcArrayColumns.getArrayType(PostgresDialect.java:164) ~[spring-data-r2dbc-1.4.0.jar:1.4.0]
    at  org.springframework.data.r2dbc.convert.MappingR2dbcConverter.getArrayValue(MappingR2dbcConverter.java:548) ~[spring-data-r2dbc-1.4.0.jar:1.4.0]
    at  org.springframework.data.r2dbc.core.DefaultReactiveDataAccessStrategy.getArrayValue(DefaultReacti veDataAccessStrategy.java:269) ~[spring-data-r2dbc-1.4.0.jar:1.4.0]
    at  org.springframework.data.r2dbc.core.DefaultReactiveDataAccessStrategy.getOutboundRow(DefaultReact iveDataAccessStrategy.java:209) ~[spring-data-r2dbc-1.4.0.jar:1.4.0]
    at  org.springframework.data.r2dbc.core.R2dbcEntityTemplate.lambda$doInsert$7(R2dbcEntityTemplate.jav a:577) ~[spring-data-r2dbc-1.4.0.jar:1.4.0]
    at reactor.core.publisher.FluxFlatMap.trySubscribeScalarMap(FluxFlatMap.java:152)  ~[reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.MonoFlatMap.subscribeOrReturn(MonoFlatMap.java:53) ~[reactor- core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:57)  ~[reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.MonoUsingWhen.subscribe(MonoUsingWhen.java:87) ~[reactor-  core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.Mono.subscribe(Mono.java:4400) ~[reactor- core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.FluxFlatMap.trySubscribeScalarMap(FluxFlatMap.java:200)  ~[reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.MonoFlatMap.subscribeOrReturn(MonoFlatMap.java:53) ~[reactor- core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:57)  ~[reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:157) ~[reactor- core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816)  ~[reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:249)  ~[reactor-core-3.4.13.jar:3.4.13]
    at  reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79)  ~[reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.FluxPeek$PeekSubscriber.onNext(FluxPeek.java:200) ~[reactor- core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.FluxPeek$PeekSubscriber.onNext(FluxPeek.java:200) ~[reactor-  core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.complete(MonoIgnoreThen.java:284) ~       [reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.onNext(MonoIgnoreThen.java:187)  ~       [reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) ~        [reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:151) ~[reactor-   core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) ~    [reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.MonoZip$ZipCoordinator.signal(MonoZip.java:251) ~[reactor-  core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.MonoZip$ZipInner.onNext(MonoZip.java:336) ~[reactor-  core-3.4.13.jar:3.4.13]
    at   reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onNext(MonoPeekTerminal.java:1  80) ~[reactor-core-3.4.13.jar:3.4.13]
    at   reactor.core.publisher.FluxDefaultIfEmpty$DefaultIfEmptySubscriber.onNext(FluxDefaultIfEmpty.java   :101) ~[reactor-core-3.4.13.jar:3.4.13]
    at    reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:74) ~[reactor-core-3.4.13.jar:3.4.13]
    at    reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79) ~[reactor-core-3.4.13.jar:3.4.13]
     at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) ~   [reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:151) ~[reactor-  core-3.4.13.jar:3.4.13]
    at   reactor.core.publisher.FluxContextWrite$ContextWriteSubscriber.onNext(FluxContextWrite.java:107)    ~       [reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.FluxMapFuseable$MapFuseableConditionalSubscriber.onNext(FluxMapFuseable.java:295) ~[reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.FluxFilterFuseable$FilterFuseableConditionalSubscriber.onNext(FluxFilterFuseable.java:337) ~[reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) ~[reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.MonoCollect$CollectSubscriber.onComplete(MonoCollect.java:159) ~[reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:142) ~[reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:260) ~[reactor-core-3.4.13.jar:3.4.13]
    at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:142) ~[reactor-core-3.4.13.jar:3.4.13]
    at reactor.netty.channel.FluxReceive.onInboundComplete(FluxReceive.java:400) ~[reactor-netty-core-1.0.14.jar:1.0.14]
    at reactor.netty.channel.ChannelOperations.onInboundComplete(ChannelOperations.java:419) ~[reactor-netty-core-1.0.14.jar:1.0.14]
    at reactor.netty.http.server.HttpServerOperations.onInboundNext(HttpServerOperations.java:590) ~[reactor-netty-http-1.0.14.jar:1.0.14]
    at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:93) ~[reactor-netty-core-1.0.14.jar:1.0.14]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at reactor.netty.http.server.HttpTrafficHandler.channelRead(HttpTrafficHandler.java:264) ~[reactor-netty-http-1.0.14.jar:1.0.14]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324) ~[netty-codec-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296) ~[netty-codec-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:795) ~[netty-transport-classes-epoll-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:480) ~[netty-transport-classes-epoll-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:378) ~[netty-transport-classes-epoll-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986) ~[netty-common-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.72.Final.jar:4.1.72.Final]
    at java.base/java.lang.Thread.run(Thread.java:829) ~[na:na]

I referred internet to resolve this problem, but didn't come across to anything helpful. Any help would be appreciable.

Answer 1

You can choose to delete all the records associated to the customer by running the command below on your DB. On your query console the command below. NOTE : If this works if you intend to delete all records associated to that customer.

alter table subscriptions
    add constraint subscriptions_subscription_id_fk
        foreign key (customer_id) references customers (id) on delete  cascade;

This is equivalent to

    @ManyToOne(mappedBy = "customer", cascade = CascadeType.ALL)

When using JPA