Java JPA和Hibernate:UnuniqueObjectException。不明白原因

我遇到了一个问题，大家都在讨论这个问题。在这种情况下，我仍然不理解背后的原因：

org.hibernate.unUniqueObjectException:具有相同标识符值的不同对象已与会话关联：[model.Asset#AMZN]

@Entity
@Table
public class Asset extends Base {
    @Id
    @Column(name = "symbol")
    private String symbol;
    ...

    @Deprecated
    Asset(){}

    public Asset(String symbol) {
        this.symbol = symbol;
    }
    
    public String getSymbol() {
        return symbol;
    }
    
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Asset asset = (Asset) o;

        return symbol.equals(asset.symbol);
    }

    @Override
    public int hashCode() {
        return symbol.hashCode();
    }
}

即使存在另一个对象，它仍然具有相同的ID，不是吗？我的equals方法比较我资产的符号。如果两个物体的符号相同，那么物体本身也是一样的吗？所以我想知道为什么这个例外首先存在

进一步资料。我在这里使用资产的例子如下：

public class Trade{
    @OneToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    @JoinColumn(name = "symbol")
    private Asset asset;

    ...
}

public synchronized void persist(Object item){
        if(!PERSIST_ENABLE) return;
        Session session = sessionFactory.getCurrentSession();
        try{
            session.beginTransaction();
            session.saveOrUpdate(item);
            session.getTransaction().commit();
        }catch (Exception e){
            //This triggers all the time
            logger.error("Error persisting data. Rolling back transaction\n",e);
            session.getTransaction().rollback();
        }finally {
            session.close();
        }
    }

我还有一个类别仓库，它可以包含多个交易，每个交易都与上述资产相关：

public class Depot{
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    @JoinColumn(name = "depot_id")
    @Fetch(FetchMode.SUBSELECT)
    private final Set<Trade> trades= new HashSet<>();
}

Asset是两个类中的一个，其中unonqueObjectException。我需要理解为什么

编辑：

完全堆栈跟踪

org.hibernate.NonUniqueObjectException: A different object with the same identifier value was already associated with the session : [com.hoehlsoft.model.Asset#AMZN]
    at org.hibernate.engine.internal.StatefulPersistenceContext.checkUniqueness(StatefulPersistenceContext.java:696)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:287)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:230)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:95)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:75)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:93)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:616)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:609)
    at org.hibernate.engine.spi.CascadingActions$5.cascade(CascadingActions.java:219)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:499)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:423)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:220)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:153)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:65)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.cascadeOnUpdate(DefaultSaveOrUpdateEventListener.java:361)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:334)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:230)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:95)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:75)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:93)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:616)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:609)
    at org.hibernate.engine.spi.CascadingActions$5.cascade(CascadingActions.java:219)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:499)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:423)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:220)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:153)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:65)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.cascadeOnUpdate(DefaultSaveOrUpdateEventListener.java:361)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:334)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:230)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:95)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:75)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:93)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:616)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:609)
    at org.hibernate.engine.spi.CascadingActions$5.cascade(CascadingActions.java:219)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:499)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:423)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:220)
    at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:532)
    at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:463)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:426)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:220)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:153)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:65)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.cascadeOnUpdate(DefaultSaveOrUpdateEventListener.java:361)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:334)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:230)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:95)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:75)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:93)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:616)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:609)
    at org.hibernate.engine.spi.CascadingActions$5.cascade(CascadingActions.java:219)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:499)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:423)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:220)
    at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:532)
    at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:463)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:426)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:220)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:153)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:65)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.cascadeOnUpdate(DefaultSaveOrUpdateEventListener.java:361)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:334)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:230)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:95)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:75)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:93)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:616)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:609)
    at org.hibernate.engine.spi.CascadingActions$5.cascade(CascadingActions.java:219)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:499)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:423)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:220)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:153)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:65)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.cascadeOnUpdate(DefaultSaveOrUpdateEventListener.java:361)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:334)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:230)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:95)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:75)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:93)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:616)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:609)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:604)
    at jdk.internal.reflect.GeneratedMethodAccessor13.invoke(Unknown Source)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.hibernate.context.internal.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:351)
    at com.sun.proxy.$Proxy55.saveOrUpdate(Unknown Source)
    at database.Db.persist(Db.java:46)
    at Trader.process(Trader.java:235)
    at Trader.onNewQuoteReceived(Trader.java:100)
    at Main.lambda$new$0(Main.java:30)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:834)

还有课堂（很好，是其中的一部分）

---

您似乎有两个相等的资产（一个是mAsset，另一个是mDepot.trades…asset），但它们是不同的对象（即asset1！=asset2）。持久化交易者打开包含对象的级联持久化，但实际上Hibernate关注具有相同ID的两个不同对象

显示org.Hibernate.ununiqueObjectException的堆栈跟踪和周围的代码。使用StackTrace更新

//加载内容，但从不接触mAsset（这是最终结果，因此始终是从db加载的对象）

表示您，但Hibernate告诉您，事实并非如此。不，事实并非如此。我可以将

final

关键字添加到

mAsset

中，并且不会发生编译器错误（除了所需的空构造函数的错误）。因此，我不创建新对象。另外，如果符号相同，那么具有相同SYMBOL的两个资产如何可以是不同的对象如果符号相同，则equals返回true？顺便说一句，fetch=FetchType。EAGER这是一种代码气味。为什么需要EAGER？确实，这两个资产都引用了一个资产，但它是相同的。当我从数据库加载数据时，我只加载Trader（级联加载所有需要/渴望的东西）…但是如果加载第二个资产，它应该休眠，而不是足够聪明地看到它们是相同的（相同的PK？）。解决方法是什么？Hibernate是否真的使用对象标识而不是相等？加载和保存是两种不同的情况。加载时，资产引用的是同一个对象。但是，Hibernate不够聪明，无法在保存时检查不同对象的嵌套级联的相等性。

org.hibernate.NonUniqueObjectException: A different object with the same identifier value was already associated with the session : [com.hoehlsoft.model.Asset#AMZN]
    at org.hibernate.engine.internal.StatefulPersistenceContext.checkUniqueness(StatefulPersistenceContext.java:696)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:287)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:230)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:95)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:75)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:93)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:616)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:609)
    at org.hibernate.engine.spi.CascadingActions$5.cascade(CascadingActions.java:219)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:499)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:423)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:220)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:153)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:65)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.cascadeOnUpdate(DefaultSaveOrUpdateEventListener.java:361)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:334)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:230)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:95)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:75)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:93)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:616)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:609)
    at org.hibernate.engine.spi.CascadingActions$5.cascade(CascadingActions.java:219)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:499)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:423)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:220)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:153)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:65)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.cascadeOnUpdate(DefaultSaveOrUpdateEventListener.java:361)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:334)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:230)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:95)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:75)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:93)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:616)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:609)
    at org.hibernate.engine.spi.CascadingActions$5.cascade(CascadingActions.java:219)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:499)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:423)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:220)
    at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:532)
    at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:463)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:426)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:220)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:153)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:65)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.cascadeOnUpdate(DefaultSaveOrUpdateEventListener.java:361)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:334)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:230)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:95)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:75)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:93)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:616)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:609)
    at org.hibernate.engine.spi.CascadingActions$5.cascade(CascadingActions.java:219)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:499)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:423)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:220)
    at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:532)
    at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:463)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:426)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:220)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:153)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:65)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.cascadeOnUpdate(DefaultSaveOrUpdateEventListener.java:361)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:334)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:230)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:95)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:75)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:93)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:616)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:609)
    at org.hibernate.engine.spi.CascadingActions$5.cascade(CascadingActions.java:219)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:499)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:423)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:220)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:153)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:65)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.cascadeOnUpdate(DefaultSaveOrUpdateEventListener.java:361)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:334)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:230)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:95)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:75)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:93)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:616)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:609)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:604)
    at jdk.internal.reflect.GeneratedMethodAccessor13.invoke(Unknown Source)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.hibernate.context.internal.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:351)
    at com.sun.proxy.$Proxy55.saveOrUpdate(Unknown Source)
    at database.Db.persist(Db.java:46)
    at Trader.process(Trader.java:235)
    at Trader.onNewQuoteReceived(Trader.java:100)
    at Main.lambda$new$0(Main.java:30)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:834)

public class Trader{
    @JoinColumn(name = "symbol")
    @OneToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    protected Asset mAsset;

    @JoinColumn(name = "depot_id")
    @OneToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    protected Depot mDepot;
    ...

    protected synchronized void process(Quote quote) {
    //Does loads of stuff but never touches the mAsset (that is final, so it always is the object loaded from db)
    //This is where it crashes
    if (oldState != mState) Db.access().persist(this);
    }