当引用的列为 null 时，延迟获取 OneToMany 集合会在 Collections.processReachableCollection 中抛出 NPE

Question

当在一对多单向映射中引用列为空时，我遇到延迟加载问题。这是我的“虚拟”代码示例：

public class A {

    @Column(name = "id")
    private UUID id;

    @Column(name = "b_reference")
    private UUID bReference;
    
    @OneToMany
    @JoinColumn(name = "b_id", referencedColumnName = "b_reference", insertable = false, updatable = false)
    private List<B> bList;
}

public class B {

    @Column(name = "id")
    private UUID id;

    @Column(name = "b_id")
    private UUID bId;

}

通过急切加载，一切正常，但我有太多条目，因此它确实影响了性能。

我正在使用最新的 quarkus 版本（2.7.1 - 也尝试过 2.31），为了测试这一点，我还编写了一个简单的命名查询： @NamedQuery(name = A.FIND, query = "从 A a 中选择 a")。

org.hibernate.resource.transaction.backend.jta.internal.synchronization.RegisteredSynchronization@4699241e >: java.lang.NullPointerException
    at org.hibernate.engine.internal.Collections.processReachableCollection(Collections.java:149)
    at org.hibernate.event.internal.FlushVisitor.processCollection(FlushVisitor.java:53)
    at org.hibernate.event.internal.AbstractVisitor.processValue(AbstractVisitor.java:104)
    at org.hibernate.event.internal.AbstractVisitor.processValue(AbstractVisitor.java:65)
    at org.hibernate.event.internal.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:59)
    at org.hibernate.event.internal.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:183)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:107)
    at org.hibernate.event.internal.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:229)
    at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:93)
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:107)
    at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1402)
    at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:493)
    at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3285)
    at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2420)
    at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:449)
    at org.hibernate.resource.transaction.backend.jta.internal.JtaTransactionCoordinatorImpl.beforeCompletion(JtaTransactionCoordinatorImpl.java:356)
    at org.hibernate.resource.transaction.backend.jta.internal.synchronization.SynchronizationCallbackCoordinatorNonTrackingImpl.beforeCompletion(SynchronizationCallbackCoordinatorNonTrackingImpl.java:47)
    at org.hibernate.resource.transaction.backend.jta.internal.synchronization.RegisteredSynchronization.beforeCompletion(RegisteredSynchronization.java:37)
    at com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.beforeCompletion(SynchronizationImple.java:76)
    at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:360)
    at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:91)
    at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:162)
    at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1295)
    at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:128)
    at io.quarkus.narayana.jta.runtime.CDIDelegatingTransactionManager.commit(CDIDelegatingTransactionManager.java:105)
    at io.quarkus.narayana.jta.runtime.CDIDelegatingTransactionManager_Subclass.commit$$superforward1(Unknown Source)
    at io.quarkus.narayana.jta.runtime.CDIDelegatingTransactionManager_Subclass$$function$$6.apply(Unknown Source)
    at io.quarkus.arc.impl.AroundInvokeInvocationContext.proceed(AroundInvokeInvocationContext.java:54)
    at io.quarkus.arc.runtime.devconsole.InvocationInterceptor.proceed(InvocationInterceptor.java:62)
    at io.quarkus.arc.runtime.devconsole.InvocationInterceptor.monitor(InvocationInterceptor.java:49)
    at io.quarkus.arc.runtime.devconsole.InvocationInterceptor_Bean.intercept(Unknown Source)
    at io.quarkus.arc.impl.InterceptorInvocation.invoke(InterceptorInvocation.java:41)
    at io.quarkus.arc.impl.AroundInvokeInvocationContext.perform(AroundInvokeInvocationContext.java:41)
    at io.quarkus.arc.impl.InvocationContexts.performAroundInvoke(InvocationContexts.java:32)
    at io.quarkus.narayana.jta.runtime.CDIDelegatingTransactionManager_Subclass.commit(Unknown Source)
    at io.quarkus.narayana.jta.runtime.interceptor.TransactionalInterceptorBase.endTransaction(TransactionalInterceptorBase.java:365)
    at io.quarkus.narayana.jta.runtime.interceptor.TransactionalInterceptorBase.invokeInOurTx(TransactionalInterceptorBase.java:165)
    at io.quarkus.narayana.jta.runtime.interceptor.TransactionalInterceptorBase.invokeInOurTx(TransactionalInterceptorBase.java:103)
    at io.quarkus.narayana.jta.runtime.interceptor.TransactionalInterceptorRequiresNew.doIntercept(TransactionalInterceptorRequiresNew.java:41)
    at io.quarkus.narayana.jta.runtime.interceptor.TransactionalInterceptorBase.intercept(TransactionalInterceptorBase.java:57)
    at io.quarkus.narayana.jta.runtime.interceptor.TransactionalInterceptorRequiresNew.intercept(TransactionalInterceptorRequiresNew.java:32)
    at io.quarkus.narayana.jta.runtime.interceptor.TransactionalInterceptorRequiresNew_Bean.intercept(Unknown Source)
    at io.quarkus.arc.impl.InterceptorInvocation.invoke(InterceptorInvocation.java:41)
    at io.quarkus.arc.impl.AroundInvokeInvocationContext.perform(AroundInvokeInvocationContext.java:41)
    at io.quarkus.arc.impl.InvocationContexts.performAroundInvoke(InvocationContexts.java:32)