Question

flex使用blazeds和java交互类型问题

下面是异常内容，环境是blazeds+spring+blazeds，User.feedBack是个Set<Feedback>,Feedback也是个model，是一对多关联类型的属性，回答追加100分到300分，~
[BlazeDS]Exception occurred during serialization: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: net.jsdn.ecommerce.core.model.User.feedBack, no session or session was closed
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:380)
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:372)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:365)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:108)
at org.hibernate.collection.PersistentBag.toArray(PersistentBag.java:280)
at java.util.ArrayList.<init>(ArrayList.java:131)
at flex.messaging.io.ArrayCollection.<init>(ArrayCollection.java:44)
at flex.messaging.io.amf.Amf3Output.writeArrayCollection(Amf3Output.java:469)
at flex.messaging.io.amf.Amf3Output.writeObject(Amf3Output.java:189)
at flex.messaging.io.amf.Amf3Output.writeObjectProperty(Amf3Output.java:257)
at flex.messaging.io.amf.Amf3Output.writePropertyProxy(Amf3Output.java:602)
at flex.messaging.io.amf.Amf3Output.writeCustomObject(Amf3Output.java:532)
at flex.messaging.io.amf.Amf3Output.writeObject(Amf3Output.java:207)
at flex.messaging.messages.AbstractMessage.writeExternalBody(AbstractMessage.java:705)
at flex.messaging.messages.AbstractMessage.writeExternal(AbstractMessage.java:435)
at flex.messaging.messages.AsyncMessage.writeExternal(AsyncMessage.java:140)
at flex.messaging.messages.AcknowledgeMessage.writeExternal(AcknowledgeMessage.java:94)
at flex.messaging.messages.AcknowledgeMessageExt.writeExternal(AcknowledgeMessageExt.java:55)
at flex.messaging.io.amf.Amf3Output.writePropertyProxy(Amf3Output.java:594)
at flex.messaging.io.amf.Amf3Output.writeCustomObject(Amf3Output.java:532)
at flex.messaging.io.amf.Amf3Output.writeObject(Amf3Output.java:112)
at flex.messaging.io.amf.Amf0Output.writeObject(Amf0Output.java:206)
at flex.messaging.io.amf.AmfMessageSerializer.writeObject(AmfMessageSerializer.java:196)
at flex.messaging.io.amf.AmfMessageSerializer.writeBody(AmfMessageSerializer.java:186)
blazeds+spring+Hibernate，上面说错了呵呵
at flex.messaging.io.ArrayCollection.<init>(ArrayCollection.java:44)
at flex.messaging.io.amf.Amf3Output.writeArrayCollection(Amf3Output.java:469)
at flex.messaging.io.amf.Amf3Output.writeObject(Amf3Output.java:189)
at flex.messaging.io.amf.Amf3Output.writeObjectProperty(Amf3Output.java:257)
at flex.messaging.io.amf.Amf3Output.writePropertyProxy(Amf3Output.java:602)
at flex.messaging.io.amf.Amf3Output.writeCustomObject(Amf3Output.java:532)
at flex.messaging.io.amf.Amf3Output.writeObject(Amf3Output.java:207)
我知道是session问题，我也设置了spring的openSessionInViewFilter，在web.xml中，但是似乎没有效果，之前用struts的mvc的时候没有这个错误，现在改用flex去掉了struts就出现了这个错误，当我提取HttpSession中的User的时候提示User中的Set容器属性未初始化，不知道怎么解决，希望高手指点一二

Answer 1

又一个用hibernate悲剧的人。。。。延迟加载出现错误。。。我想是不是用外连接查询的时候调用外连接连接表的数据时报的错。。。我估计你是用hibernatesupportdao的save，find方法来提取数据，这样写肯定要报错。。。
用hql来写，首先在所有pojo的配置文件设置lazy=“false”。 然后用hql写
比如User表有个外键连接Employee ，String hql="select new cn..(包名).User() from User u right join empolyee"。记住“new cn..(包名).User() ”是创建了一个实例，所以括号内必须和User的构造方法一致

Answer 2

数据传输异常或session已关闭

Answer 3

session 关闭了。请确保数据库的连接没有关闭或者在关闭前先访问一下需要使用的内容

Answer 4

1111