Dear all,
I encountered LazyInitializationException today in my SSH project today as follows.
Code:
>>>>>>>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.
Code:
<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.
Code:
>>>>>>>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 actually an ajax action and the result is in json format ready to be passed back.
Code:
<package name="ajax" namespace="/" extends="json-default">
...
<action name="getInfoByCustomer" class="ajaxGetInfoByCustomer">
<result type="json" />
</action>
...
</package>
Could anyone kindly to glance it?
Terry.
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