Hibernate LazyInitializationException And p:selectCheckboxMenu
I had a simple Entity with a @oneToMany relationship.
Let’s call the Entity “Store” and the Entity of the relationship “Product”, obviously a Store has many Products.
When it comes to use selectCheckboxMenu with the input (update) of products, a bug arise “org.hibernate.LazyInitializationException: could not initialize proxy – no Session”.
For some reason using the primefaces selectCheckboxMenu (or h:selectmanycheckbox of the slandered JSF components) would end the Session of the current transaction.
to solve this issue I had to supply the type of my collection to the component with attribute name=”collectionType”.
<p:selectCheckboxMenu >
<f:attribute name="collectionType" value="java.util.ArrayList" />
<f:selectItems value="#{bean.getStoreProducts()}"
var="product" itemLabel="#{product.name}"
itemValue="#{product}" />
</p:selectCheckboxMenu>
it depends on your type of List if it’s a Set for example you can use java.util.HashSet instead of java.util.ArrayList.