One-to-Many relational mappings are not executing correctly in spring reactive web-flux - spring

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