It's hibernate thing (I guess db connection timeout). What's your DB? mysql?

2010/10/29 cellterry <cellte...@gmail.com>:
>
> Dear all,
>
> I encountered LazyInitializationException today in my SSH project today as
> follows.
>
>>>>>>>>LOG4J<<<<<<< 1 2010-10-29 17:37:42,454 [http-8080-2] ERROR
> org.hibernate.LazyInitializationException  -
> #org.hibernate.LazyInitializationException.<init>(LazyInitializationException.java:19)#
> - failed to lazily initialize a collection of role: model.Customer.people,
> no session or session was closed
> org.hibernate.LazyInitializationException: failed to lazily initialize a
> collection of role: model.Customer.people, no session or session was closed
>        at
> org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
>        at
> org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
>        at
> org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
>        at
> org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
>        at 
> org.hibernate.collection.PersistentBag.iterator(PersistentBag.java:249)
>        at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:155)
>        at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
>        at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:329)
>        at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:228)
>        at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
>        at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
>        at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:329)
>        at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:228)
> ...
>
>
> I had searched online and found that someone suggested to use
> OpenSessionInViewFilter in web.xml like the following. However, it had no
> effect to me and the same error still happened.
>
>        <filter>
>                <filter-name>hibernateFilter</filter-name>
>                <filter-class>
>
> org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
>        </filter>
>        <filter-mapping>
>                <filter-name>hibernateFilter</filter-name>
>                <url-pattern>*.action</url-pattern>
>        </filter-mapping>
>
> And someone suggested to set "lazy" to be true for many-to-one items in
> hibernate xml.
> However, after modifying the code another error happened as below.
>
>>>>>>>>LOG4J<<<<<<< 2 2010-10-29 17:46:59,907 [http-8080-2] ERROR
> org.hibernate.LazyInitializationException  -
> #org.hibernate.LazyInitializationException.<init>(LazyInitializationException.java:19)#
> - could not initialize proxy - no Session
> org.hibernate.LazyInitializationException: could not initialize proxy - no
> Session
>        at
> org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:57)
>        at
> org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:111)
>        at
> org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:150)
>        at model.Customer$$EnhancerByCGLIB$$4d304287.getAddress(<generated>)
>        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>        at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>        at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>        at java.lang.reflect.Method.invoke(Method.java:616)
>        at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:227)
>        at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
>        at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
>        at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:329)
> ...
>
> It is an ajax action and the result is in json format to be passed back.
>
>
> <package name="ajax" namespace="/" extends="json-default">
>                ...
>                <action name="getInfoByCustomer" class="ajaxGetInfoByCustomer">
>                        <result type="json" />
>                </action>
>                ...
>        </package>
> I attached here the action file and model files and also hibernate xmls.
>
> http://old.nabble.com/file/p30084356/GetInfoByCustomer.java
> GetInfoByCustomer.java
> http://old.nabble.com/file/p30084356/customer.person.hbm.xml
> customer.person.hbm.xml
> http://old.nabble.com/file/p30084356/Warehouse.java Warehouse.java
> http://old.nabble.com/file/p30084356/CustomerPerson.java CustomerPerson.java
> http://old.nabble.com/file/p30084356/Warehouse.java Warehouse.java
>
> Could anyone kindly to glance it?
>
> Terry.
>
> --
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>
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>



-- 
Maurizio Cucchiara

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