TongWeb做session复制报错LazyInitializationException

Question

TongWeb做session复制报错LazyInitializationException 具体如下，请问如何解决？

Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection, could not initialize proxy - no Session
    at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:582)
    at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:201)
    at org.hibernate.collection.internal.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:145)
    at org.hibernate.collection.internal.PersistentBag.size(PersistentBag.java:261)
    at com.tongweb.serializer.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:65)
    at com.tongweb.serializer.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:22)
    at com.tongweb.serializer.kryo.Kryo.writeObject(Kryo.java:571)
    at com.tongweb.serializer.kryo.serializers.ObjectField.write(ObjectField.java:61)
    ... 42 more

Answer 1

这是在session复制时要将相关对象序列化，而Hibernate使用懒加载来加载相关数据，就会抛出LazyInitializationException异常。解决办法：
使用FetchType.EAGER加载策略， 将关联实体的加载策略从FetchType.LAZY（懒加载）改为FetchType.EAGER（立即加载）。这意味着相关联的实体或集合将在查询主实体时一起加载，避免了延迟加载引发的异常。

@OneToMany(fetch = FetchType.EAGER)
private Set<Children> children;