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私は現在、micronaut データを既存の micronaut プロジェクトに (アップグレードの一環として) 組み込む過程にあり、関連するコレクションを (OneToManyリレーションを使用して) 遅延フェッチすることに関していくつかの問題が発生しています。

私は次のエンティティ構造を持っています:

@Data
@Entity
@NoArgsConstructor
@AllArgsConstructor
@Builder(toBuilder = true)
public class Merchant implements Serializable {

  @Id private String name;

  private String displayName;

  private String staticSiteAddress;

  private String emailFromAddress;

  private String emailFromName;

  private String etmEmailFromAddress;

  private String etmEmailFromName;

  private String phone;

  private String username;

  @Embedded private PasswordHash password;

  @ToString.Exclude
  @EqualsAndHashCode.Exclude
  @OneToMany(mappedBy = "merchant", fetch = FetchType.LAZY)
  @Builder.Default
  private Set<MerchantStore> stores = new HashSet<>();

  @ToString.Exclude
  @EqualsAndHashCode.Exclude
  @OneToMany(mappedBy = "merchant", fetch = FetchType.LAZY)
  @Builder.Default
  private Set<CustomWebLink> customWebLinks = new HashSet<>();

  @ToString.Exclude
  @EqualsAndHashCode.Exclude
  @OneToMany(mappedBy = "merchant", fetch = FetchType.LAZY)
  @Builder.Default
  private Set<LoyaltyPlan> loyaltyPlans = new HashSet<>();

  @ToString.Exclude
  @EqualsAndHashCode.Exclude
  @OneToMany(mappedBy = "merchant", fetch = FetchType.LAZY)
  @Builder.Default
  private Set<MerchantPref> merchantPrefs = new HashSet<>();

}

手元にあるmerchantPrefsので、次のリポジトリ メソッドを使用して、問題なく第 1 レベルの関連エンティティ (つまり)を取得できます。

@NonNull
@Override
@Cacheable("merchant")
@Join(value = "stores", type = Join.Type.LEFT_FETCH)
@Join(value = "customWebLinks", type = Join.Type.LEFT_FETCH)
@Join(value = "merchantPrefs", type = Join.Type.LEFT_FETCH)
@Join(value = "loyaltyPlans", type = Join.Type.LEFT_FETCH)
Optional<Merchant> findById(@NonNull @NotNull String s);

awardsただし、たとえばこのエンティティから最も内側のコレクションを取得しようとすると:

@Data
@Entity
public class LoyaltyPlan implements Serializable {

  @EmbeddedId private LoyaltyPlanID id;

  @ToString.Exclude
  @EqualsAndHashCode.Exclude
  @ManyToOne(fetch = FetchType.LAZY)
  @MapsId("merchant")
  @JoinColumn(name = "merchant", nullable = false)
  private Merchant merchant;

  private String displayName;

  private String emailFromName;

  private String emailFromAddress;

  private String uniqueId;

  private boolean defaultPlan;

  private float pointsFactor;

  private boolean hasGiftCards;

  private boolean hasLoyaltyCards;

  private boolean usesName;

  private boolean hasEmail;

  private boolean hasCellPhone;

  private boolean needsGiftCards;

  private boolean needsLoyaltyCards;

  private boolean needsName;

  private boolean needsEmail;

  private boolean needsCellPhone;

  private int signupBonus;

  private int closingAwardThreshold;

  private int maxPointsPerOrder;

  private int minPricePerOrder;

  private int recentHistoryDays;

  private int expiringCouponReminderDays;

  @ToString.Exclude
  @EqualsAndHashCode.Exclude
  @OneToMany(mappedBy = "loyaltyPlan", fetch = FetchType.LAZY)
  private List<LoyaltyPlanAward> awards;
}

を取得しLazyInitializationExceptionます。

org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: fts.marketing.entities.plan.LoyaltyPlan.awards, could not initialize proxy - no Session
    at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:606)
    at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:218)
    at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:585)
    at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:149)
    at org.hibernate.collection.internal.PersistentBag.iterator(PersistentBag.java:387)
    at java.base/java.lang.Iterable.forEach(Iterable.java:74)
    at fts.marketing.TestController.doSomething(TestController.java:29)
    at fts.marketing.$TestControllerDefinition$Intercepted.$$access$$doSomething(Unknown Source)
    at fts.marketing.$TestControllerDefinition$$exec1.invokeInternal(Unknown Source)
    at io.micronaut.context.AbstractExecutableMethod.invoke(AbstractExecutableMethod.java:146)
    at io.micronaut.aop.chain.MethodInterceptorChain.proceed(MethodInterceptorChain.java:73)
    at io.micronaut.transaction.interceptor.TransactionalInterceptor.intercept(TransactionalInterceptor.java:134)
    at io.micronaut.aop.chain.MethodInterceptorChain.proceed(MethodInterceptorChain.java:82)
    at fts.marketing.$TestControllerDefinition$Intercepted.doSomething(Unknown Source)
    at fts.marketing.$TestControllerDefinition$$exec1.invokeInternal(Unknown Source)
    at io.micronaut.context.AbstractExecutableMethod.invoke(AbstractExecutableMethod.java:146)
    at io.micronaut.context.DefaultBeanContext$4.invoke(DefaultBeanContext.java:474)
    at io.micronaut.web.router.AbstractRouteMatch.execute(AbstractRouteMatch.java:312)
    at io.micronaut.web.router.RouteMatch.execute(RouteMatch.java:118)
    at io.micronaut.http.server.netty.RoutingInBoundHandler.lambda$buildResultEmitter$10(RoutingInBoundHandler.java:1369)
    at io.reactivex.internal.operators.flowable.FlowableDefer.subscribeActual(FlowableDefer.java:35)
    at io.reactivex.Flowable.subscribe(Flowable.java:14935)
    at io.reactivex.Flowable.subscribe(Flowable.java:14882)
    at io.micronaut.http.server.context.ServerRequestContextFilter.lambda$doFilter$0(ServerRequestContextFilter.java:62)
    at io.reactivex.internal.operators.flowable.FlowableFromPublisher.subscribeActual(FlowableFromPublisher.java:29)
    at io.reactivex.Flowable.subscribe(Flowable.java:14935)
    at io.reactivex.Flowable.subscribe(Flowable.java:14885)
    at io.micronaut.http.server.netty.RoutingInBoundHandler.lambda$buildExecutableRoute$6(RoutingInBoundHandler.java:1074)
    at io.micronaut.web.router.DefaultUriRouteMatch$1.execute(DefaultUriRouteMatch.java:80)
    at io.micronaut.web.router.RouteMatch.execute(RouteMatch.java:118)
    at io.micronaut.http.server.netty.RoutingInBoundHandler.handleRouteMatch(RoutingInBoundHandler.java:698)
    at io.micronaut.http.server.netty.RoutingInBoundHandler.channelRead0(RoutingInBoundHandler.java:554)
    at io.micronaut.http.server.netty.RoutingInBoundHandler.channelRead0(RoutingInBoundHandler.java:1

さらに、同じコードが正常に動作しているように見えることもあるため、これは散発的な問題のようです。何が問題なのかよくわかりませんが、 に移行する前は問題がなかったので、関係を正しくモデル化したと思いますmicronaut-data。

ここで何が間違っているのかわかりません。これを解決するために、どんな助けでも大歓迎です。

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