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我试图将一组我称之为相对简单的对象保存到数据库中。不幸的是，Hibernate 似乎忽略了我的几个类上的 @Transient 注释（或者它试图序列化，甚至带有注释）。当我有无法序列化的类时，这会导致严重错误。

如果需要，我可以使 AxisEventHandler 类可序列化，但是如果我不能（例如它是封闭源代码库中的最终类），那我该怎么办？

我可以提供有关 GenericEventHandler 类的更多信息或我为简洁起见而注释掉的任何代码（但我不认为它们特别重要......我可能是错的）。

例外：

org.hibernate.type.SerializationException: could not serialize
    at org.hibernate.util.SerializationHelper.serialize(SerializationHelper.java:139)
    at org.hibernate.util.SerializationHelper.serialize(SerializationHelper.java:164)
    at org.hibernate.util.SerializationHelper.clone(SerializationHelper.java:95)
    at org.hibernate.type.descriptor.java.SerializableTypeDescriptor$SerializableMutabilityPlan.deepCopyNotNull(SerializableTypeDescriptor.java:54)
    at org.hibernate.type.descriptor.java.SerializableTypeDescriptor$SerializableMutabilityPlan.deepCopyNotNull(SerializableTypeDescriptor.java:42)
    at org.hibernate.type.descriptor.java.MutableMutabilityPlan.deepCopy(MutableMutabilityPlan.java:58)
    at org.hibernate.type.AbstractStandardBasicType.deepCopy(AbstractStandardBasicType.java:314)
    at org.hibernate.type.AbstractStandardBasicType.deepCopy(AbstractStandardBasicType.java:310)
    at org.hibernate.type.TypeHelper.deepCopy(TypeHelper.java:68)
    at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:302)
    at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203)
    at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
    at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
    at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
    at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:713)
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:701)
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:697)
    at com.mypandafinance.amino.gui.ccsimple.CCSimpleApp.initApplication(CCSimpleApp.java:55)
    at com.mypandafinance.amino.AminoBoot.main(AminoBoot.java:101)
Caused by: java.io.NotSerializableException: com.mypandafinance.chartcomponent.eventhandlers.AxisEventHandler
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1180)
    at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
    at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
    at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
    at org.hibernate.util.SerializationHelper.serialize(SerializationHelper.java:135)
    ... 21 more

主轴类：

@Entity
@Inheritance(strategy=InheritanceType.JOINED)
public abstract class Axis implements Serializable {
    private int axisId;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    public int getAxisId() { return axisId; }
    protected void setAxisId(int id) { this.axisId = id; }

    @Transient
    public abstract long getMax();
    public abstract void setMax(long max);

    @Transient
    public abstract long getMin();
    public abstract void setMin(long min);

    /* ... helper methods here */

    @Transient
    public abstract AxisEventHandler getEventHandler();

    @Transient
    public abstract AxisFlagHandler getFlagHandler();

    @Transient
    public abstract TickMarkFormatter getTickMarkFormatter();
    public abstract void setTickMarkFormatter(TickMarkFormatter formatter);
}

基本实现：

@Entity
@SecondaryTable(name="BasicAxis")
public class BasicAxis extends Axis {
    private long min;
    private long max;

    // Event handler, used for firing off events to all listeners
    private AxisEventHandler eventHandler = new AxisEventHandler();

    // Flag handler, used for storing axis flags
    private SerializableAxisFlagHandler flagHandler;

    private TickMarkFormatter formatter;

    /* ... constructors */

    @Column(name="rangemax")
    @Override public long getMax() { return max; }
    @Override public void setMax(long max) { /* ... */ }

    @Column(name="rangemin")
    @Override public long getMin() { return min; }
    @Override public void setMin(long min) { /* ... */ }

    @Override public void setRange(long min, long max) { /* ... */ }
    @Override public void pan(long amount) { /* ... */ }

    @Transient
    @Override public AxisEventHandler getEventHandler() { /* ... */ }

    @Type(type="com.mypandafinance.chartcomponent.hibernateusertypes.AxisFlagHandlerUserType")
    @Column(name="flags")
    @Override public SerializableAxisFlagHandler getFlagHandler() { /* ... */ }
    protected void setFlagHandler(SerializableAxisFlagHandler flagHandler) { /* ... */ }

    @Column(name="formatter", table="BasicAxis")
    @Override public TickMarkFormatter getTickMarkFormatter() { /* ... */ }
    @Override public void setTickMarkFormatter(TickMarkFormatter formatter) { /* ... */ }

    /* ... helper methods */
}

AxisEventHandler 类：

public class AxisEventHandler extends GenericEventHandler<AxisEventListener> {
    public AxisEventHandler() { super(new AxisEventListener[0]); }
}
4

2 回答 2

4

没关系，我似乎犯了一个错误，回想起来，我不应该花几个小时来弄清楚。问题不在于休眠，也不在于休眠（除了休眠使用标准 java 序列化）。

这些字段不仅需要使用 JPA @Transient 注解进行标记，而且对于 Serializable 接口也需要是瞬态的（因为，出于某种原因，Hibernate 在持久化对象之前会对其进行序列化？）

使固定：

public class BasicAxis extends Axis {
    /* ... */
   private transient AxisEventHandler eventHandler = new AxisEventHandler();
    /* ... */
}
于 2011-12-09T06:01:56.433 回答
1

这只是发生在我身上，我也为此浪费了几个小时。在添加transientJava 修饰符消除了直接错误的同时，我不断收到越来越多奇怪的序列化错误，直到最终的 Hibernate 抱怨它无法将我的对象的二进制表示插入到字段中（因为它太长了：

Caused by: org.h2.jdbc.JdbcBatchUpdateException: Value too long for column

真正的问题？我不小心搞砸了一个 JPA 注释。我这样做了：

@Column(name = "val_foo")
private Foo val;

而不是这个：

@OneToOne(targetEntity = FooImpl.class, cascade = { PERSIST })
@JoinColumn(name = "val_foo", referencedColumnName = "uuid")
private Foo val;

希望有一天这对某人有所帮助...

于 2013-06-30T18:18:10.393 回答