I have a simple Seam app that displays the list of categories as a datatable
and selecting a category from that. All works fine till that point. In the next
request(i.e. after a category has been selected), Im trying to get the books
that are associated with the category . The relation between Category to Books
is OneToMany.
When trying to access the books for that category, I get the following LIE
| Caused by: org.hibernate.LazyInitializationException: failed to lazily
initialize a collection of role: com.rajasaur.bookxchange.model.Category.books,
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.PersistentSet.iterator(PersistentSet.java:138)
| at
com.rajasaur.bookxchange.action.CategoryActionsBean.updateCategory(CategoryActionsBean.java:112)
| 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.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
| at
org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
| at
org.jboss.seam.interceptors.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
| at
org.jboss.seam.interceptors.ValidationInterceptor.validateTargetComponent(ValidationInterceptor.java:64)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
|
CategoryActionsBean(Which is a Session Scoped Stateful bean) contains the
following mappings.
@In(create=true)
| private EntityManager em;
| @In(required=false) @Valid
| private Category category;
| @DataModel
| private List<Category> categories;
| @DataModelSelection(value="categories") @Out(required=false,
scope=ScopeType.CONVERSATION)
| private Category selectedCategory;
|
The Category Entity Bean also has 2 roles, category and selectedCategory, both
of them in the Conversation Scope. Im totally at a loss as to why this is
happening.
According to the forums, if a component is in Conversational Scope and if we
use the Seam managed PC, it should work , but I cant get this to work. If I put
in a em.refresh before accessing the collection , then it works fine, but I
thought Seam should be able to keep the collections intact from the previous
request (as per Section 9.4 in the Seam Docs).
If someone can point me to some docs or the problem, greatly appreciate it. Ive
been debugging this for almost a few hours now, but cant get anywhere.
Thanks
Raja
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