merging a @ManyToOne association can call non-reactive code

Hi, I need to update ‘erp_campus_id’ in ‘erp_academic_year_detail’ table. The same code will works If I used normal hibernate. But In hibernate-reactive it throws an exception. I am using 1.0.0.CR9 version.

AcademicYearDetaisDBO dbo = sessionFactory.withSession(session -> session.createQuery("select dbo from AcademicYearDetaisDBO dbo where dbo.id=386",AcademicYearDetaisDBO.class).getSingleResult()).await().indefinitely();

dbo.setRecordStatus('A');
System.out.println(dbo.getCampusId().getId());//for example here campus id is 11
CampusDBO campusDBO = new CampusDBO();
campusDBO.setId(5);
dbo.setCampusId(campusDBO); // need to update as 5

sessionFactory.withTransaction((session, transaction) -> session.merge(dbo)).await().indefinitely(); // here it will throw an exception

@Getter
@Setter
@Entity
@Table(name = "erp_academic_year_detail")
public class AcademicYearDetaisDBO implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "erp_academic_year_detail_id")
    private Integer id;

    @ManyToOne
    @JoinColumn(name = "erp_campus_id")
    private CampusDBO campusId;

    @Column(name = "record_status")
    private char recordStatus;

    @Column(name = "created_users_id")
    private Integer createdUsersId;

    @Column(name = "modified_users_id")
    private Integer modifiedUsersId;
}

@Entity
@Getter
@Setter
@Table(name="erp_campus")
public class CampusDBO implements Serializable {
        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        @Column(name="erp_campus_id")
        private  Integer id;

        @Column(name="campus_name")
        private String campusName;
}

Exception:

javax.persistence.PersistenceException: org.hibernate.HibernateException: java.util.concurrent.CompletionException: org.hibernate.reactive.event.impl.UnexpectedAccessToTheDatabase: Unexpected access to the database
	at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:154) ~[hibernate-core-5.5.7.Final.jar:5.5.7.Final]
	at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:181) ~[hibernate-core-5.5.7.Final.jar:5.5.7.Final]
	at org.hibernate.reactive.session.impl.ReactiveExceptionConverter.convert(ReactiveExceptionConverter.java:31) ~[hibernate-reactive-core-1.0.0.CR9.jar:1.0.0.CR9]
	at org.hibernate.reactive.session.impl.ReactiveSessionImpl.lambda$fireMerge$28(ReactiveSessionImpl.java:842) ~[hibernate-reactive-core-1.0.0.CR9.jar:1.0.0.CR9]
	at java.util.concurrent.CompletableFuture.uniHandle(CompletableFuture.java:836) ~[na:1.8.0_301]
	at java.util.concurrent.CompletableFuture$UniHandle.tryFire(CompletableFuture.java:811) ~[na:1.8.0_301]
	at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488) ~[na:1.8.0_301]
	at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1975) ~[na:1.8.0_301]
	at com.ibm.asyncutil.iteration.AsyncTrampoline$TrampolineInternal.unroll(AsyncTrampoline.java:127) ~[asyncutil-0.1.0.jar:na]
	at com.ibm.asyncutil.iteration.AsyncTrampoline$TrampolineInternal.lambda$unroll$0(AsyncTrampoline.java:123) ~[asyncutil-0.1.0.jar:na]
	at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:774) ~[na:1.8.0_301]
	at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:750) ~[na:1.8.0_301]
	at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488) ~[na:1.8.0_301]
	at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1975) ~[na:1.8.0_301]
	at io.vertx.core.Future.lambda$toCompletionStage$2(Future.java:360) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.FutureImpl$3.onSuccess(FutureImpl.java:124) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.FutureBase.emitSuccess(FutureBase.java:62) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.FutureImpl.tryComplete(FutureImpl.java:179) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.PromiseImpl.tryComplete(PromiseImpl.java:23) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.sqlclient.impl.QueryResultBuilder.tryComplete(QueryResultBuilder.java:102) ~[vertx-sql-client-4.1.2.jar:4.1.2]
	at io.vertx.sqlclient.impl.QueryResultBuilder.tryComplete(QueryResultBuilder.java:35) ~[vertx-sql-client-4.1.2.jar:4.1.2]
	at io.vertx.core.Promise.complete(Promise.java:66) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.Promise.handle(Promise.java:51) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.Promise.handle(Promise.java:29) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.FutureImpl$3.onSuccess(FutureImpl.java:124) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.FutureBase.emitSuccess(FutureBase.java:62) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.FutureImpl.tryComplete(FutureImpl.java:179) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.PromiseImpl.tryComplete(PromiseImpl.java:23) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.PromiseImpl.onSuccess(PromiseImpl.java:49) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.PromiseImpl.handle(PromiseImpl.java:41) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.sqlclient.impl.TransactionImpl.lambda$wrap$0(TransactionImpl.java:72) ~[vertx-sql-client-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.FutureImpl$3.onSuccess(FutureImpl.java:124) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.FutureBase.emitSuccess(FutureBase.java:62) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.FutureImpl.tryComplete(FutureImpl.java:179) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.PromiseImpl.tryComplete(PromiseImpl.java:23) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.PromiseImpl.onSuccess(PromiseImpl.java:49) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.PromiseImpl.handle(PromiseImpl.java:41) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.future.PromiseImpl.handle(PromiseImpl.java:23) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.sqlclient.impl.command.CommandResponse.fire(CommandResponse.java:46) ~[vertx-sql-client-4.1.2.jar:4.1.2]
	at io.vertx.sqlclient.impl.SocketConnectionBase.handleMessage(SocketConnectionBase.java:279) ~[vertx-sql-client-4.1.2.jar:4.1.2]
	at io.vertx.sqlclient.impl.SocketConnectionBase.lambda$init$0(SocketConnectionBase.java:98) ~[vertx-sql-client-4.1.2.jar:4.1.2]
	at io.vertx.core.net.impl.NetSocketImpl.lambda$new$1(NetSocketImpl.java:97) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.streams.impl.InboundBuffer.handleEvent(InboundBuffer.java:240) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.streams.impl.InboundBuffer.write(InboundBuffer.java:130) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.net.impl.NetSocketImpl.lambda$handleMessage$9(NetSocketImpl.java:390) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.EventLoopContext.emit(EventLoopContext.java:49) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.ContextImpl.emit(ContextImpl.java:275) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.impl.EventLoopContext.emit(EventLoopContext.java:22) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.net.impl.NetSocketImpl.handleMessage(NetSocketImpl.java:389) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.net.impl.ConnectionBase.read(ConnectionBase.java:155) ~[vertx-core-4.1.2.jar:4.1.2]
	at io.vertx.core.net.impl.VertxHandler.channelRead(VertxHandler.java:154) ~[vertx-core-4.1.2.jar:4.1.2]



Caused by: java.util.concurrent.CompletionException: org.hibernate.reactive.event.impl.UnexpectedAccessToTheDatabase: Unexpected access to the database
	at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273) ~[na:1.8.0_301]
	at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280) ~[na:1.8.0_301]
	at java.util.concurrent.CompletableFuture.uniAccept(CompletableFuture.java:673) ~[na:1.8.0_301]
	at java.util.concurrent.CompletableFuture.uniAcceptStage(CompletableFuture.java:683) ~[na:1.8.0_301]
	at java.util.concurrent.CompletableFuture.thenAccept(CompletableFuture.java:2010) ~[na:1.8.0_301]
	at java.util.concurrent.CompletableFuture.thenAccept(CompletableFuture.java:110) ~[na:1.8.0_301]
	at org.hibernate.reactive.event.impl.DefaultReactiveMergeEventListener.fetchAndCopyValues(DefaultReactiveMergeEventListener.java:484) ~[hibernate-reactive-core-1.0.0.CR9.jar:1.0.0.CR9]
	at org.hibernate.reactive.event.impl.DefaultReactiveMergeEventListener.lambda$null$8(DefaultReactiveMergeEventListener.java:348) ~[hibernate-reactive-core-1.0.0.CR9.jar:1.0.0.CR9]
	at java.util.concurrent.CompletableFuture.uniComposeStage(CompletableFuture.java:995) ~[na:1.8.0_301]
	at java.util.concurrent.CompletableFuture.thenCompose(CompletableFuture.java:2137) ~[na:1.8.0_301]
	at java.util.concurrent.CompletableFuture.thenCompose(CompletableFuture.java:110) ~[na:1.8.0_301]
	at org.hibernate.reactive.event.impl.DefaultReactiveMergeEventListener.lambda$entityIsDetached$10(DefaultReactiveMergeEventListener.java:348) ~[hibernate-reactive-core-1.0.0.CR9.jar:1.0.0.CR9]
	at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:966) ~[na:1.8.0_301]
	at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:940) ~[na:1.8.0_301]
	... 78 common frames omitted
Caused by: org.hibernate.reactive.event.impl.UnexpectedAccessToTheDatabase: Unexpected access to the database
	at org.hibernate.reactive.event.impl.DefaultReactiveLoadEventListener.onLoad(DefaultReactiveLoadEventListener.java:107) ~[hibernate-reactive-core-1.0.0.CR9.jar:1.0.0.CR9]
	at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:118) ~[hibernate-core-5.5.7.Final.jar:5.5.7.Final]
	at org.hibernate.internal.SessionImpl.fireLoadNoChecks(SessionImpl.java:1215) ~[hibernate-core-5.5.7.Final.jar:5.5.7.Final]
	at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:1080) ~[hibernate-core-5.5.7.Final.jar:5.5.7.Final]
	at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:697) ~[hibernate-core-5.5.7.Final.jar:5.5.7.Final]
	at org.hibernate.type.EntityType.resolve(EntityType.java:464) ~[hibernate-core-5.5.7.Final.jar:5.5.7.Final]
	at org.hibernate.type.ManyToOneType.resolve(ManyToOneType.java:240) ~[hibernate-core-5.5.7.Final.jar:5.5.7.Final]
	at org.hibernate.type.EntityType.resolve(EntityType.java:457) ~[hibernate-core-5.5.7.Final.jar:5.5.7.Final]
	at org.hibernate.type.EntityType.replace(EntityType.java:358) ~[hibernate-core-5.5.7.Final.jar:5.5.7.Final]
	at org.hibernate.type.TypeHelper.replace(TypeHelper.java:167) ~[hibernate-core-5.5.7.Final.jar:5.5.7.Final]
	at org.hibernate.reactive.event.impl.DefaultReactiveMergeEventListener.copyValues(DefaultReactiveMergeEventListener.java:493) ~[hibernate-reactive-core-1.0.0.CR9.jar:1.0.0.CR9]
	at org.hibernate.reactive.event.impl.DefaultReactiveMergeEventListener.lambda$fetchAndCopyValues$14(DefaultReactiveMergeEventListener.java:484) ~[hibernate-reactive-core-1.0.0.CR9.jar:1.0.0.CR9]
	at java.util.concurrent.CompletableFuture.uniAccept(CompletableFuture.java:670) ~[na:1.8.0_301]

[DavideD]

THanks @nivinps, I’m checking

[nivinps]

What you’re doing right now might work, at least if you’re careful, but it’s not how this API is intended to be used.

OK @gavinking. Thank you once again.