Question

hibernate 一对多的双向关联 查询异常

POJO:
用户:
private String fileid;
private Users users;
private String filename;
private String filesize;
private String fileuptime;
private Long isshare;
private String image;
xml配置：
<set name="fileses" inverse="true" cascade="all" lazy="false">
<key>
<column name="OID" />
</key>
<one-to-many class="com.wisoft.myapp.pojo.Files" />
</set>

POJO:
文件：
private String oid;
private String userid;
private String username;
private String password;
private Long isadmin;
private Set<Files> fileses = new HashSet(0);
xml配置：
<many-to-one name="users" class="com.wisoft.myapp.pojo.Users"

fetch="select" >
<column name="OID" />
</many-to-one>

查询：
public Files[] findFilesByUserId(String userid)
{
Object[] parms=new Object[1];
parms[0]=userid;
List<Files> lst =this.find("From Files as m where

m.users.oid =?",parms);
if(lst!=null&&lst.size()>0)
{
return lst.toArray(new Files[0]);
}
return null;
}

异常：
Hibernate: select files0_.FILEID as FILEID, files0_.FILENAME as

FILENAME1_, files0_.FILESIZE as FILESIZE1_, files0_.FILEUPTIME as

FILEUPTIME1_, files0_.ISSHARE as ISSHARE1_, files0_.IMAGE as IMAGE1_,

files0_.OID as OID1_ from SA.FILES files0_ where files0_.OID=?
2012-03-06 16:10:07,759-- ERROR -- could not initialize proxy - the

owning Session was closed -- [org.hibernate.LazyInitializationException]
org.hibernate.LazyInitializationException: could not initialize proxy -

the owning Session was closed
at org.hibernate.proxy.AbstractLazyInitializer.initialize

(AbstractLazyInitializer.java:53)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation

(AbstractLazyInitializer.java:84)
at org.hibernate.proxy.CGLIBLazyInitializer.intercept

(CGLIBLazyInitializer.java:134)
at

com.wisoft.myapp.pojo.Users$$EnhancerByCGLIB$$d75da000.getFileses

(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke

(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke

(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.codehaus.xfire.aegis.type.basic.BeanType.readProperty

(BeanType.java:442)
at org.codehaus.xfire.aegis.type.basic.BeanType.writeObject

(BeanType.java:377)
at org.codehaus.xfire.aegis.type.basic.BeanType.writeObject

(BeanType.java:392)
at org.codehaus.xfire.aegis.type.basic.ArrayType.writeValue

(ArrayType.java:298)
at org.codehaus.xfire.aegis.type.basic.ArrayType.writeObject

(ArrayType.java:210)
at org.codehaus.xfire.aegis.AegisBindingProvider.writeParameter

(AegisBindingProvider.java:229)
at

org.codehaus.xfire.service.binding.AbstractBinding.writeParameter

(AbstractBinding.java:273)
at

Answer 1

LazyInitializationException,hibernate非常重要的两个异常之一，见图片

Answer 2

你的查询函数返回了一个数据结构，你在主函数里面调用他？如果是这样，那么这样就不行了，因为这个对象已经处于脱管状态，需要设置他的惰性初始化

Answer 3

List<Files> lst =this.find("From Files as m where m.users.oid =?",new Object[]{userid});

Answer 4

From Files as m where m.users.oid =?",parms