As soon as I added a version column to a parent class (PurchaseOrder that has a collection of PurchaseOrderLine objects) the session starting forcing an update to the PurchaseOrder header record -- EVEN if no property values changed. This was working perfectly BEFORE I added the version column.
I presume it is an issue with the one-to-many association with lines (mapped "all-delete-orphan" because I am successfully using version columns elsewhere in my application. However, this is the first place where I am using a version column in a class mapped with a one-to-many association.
The PurchaseOrder object is being populated in the web tier outside an active session but it is being reattached/updated via the merge() method on the session inside a business tier method. Again, I've tested that it is the addition of the version column mapping that is changing the behavior and forcing the update. When I remove the version column, the session is not flushing a "dirty" PurchaseOrder when the property values didn't change. For reference, the relevant portion of my mapping file:
<class name="com.mydomain.PurchaseOrder" table="purchase_order" >
<id name="id" column="id">
<generator class="identity"/>
</id>
<version name="version" column="version"/>
<many-to-one name="supplier" column="supplier_id" not-null="true"/>
<many-to-one name="location" column="location_id" not-null="true"/>
<many-to-one name="buyingCompany" column="buying_company_id" not-null="true"/>
<many-to-one name="targetOwner" column="target_owner_id" not-null="true"/>
<many-to-one name="shippingAddress" column="shipping_address_id" not-null="true"/>
<many-to-one name="shippingMethod" column="shipping_method_id" not-null="true"/>
<many-to-one name="paymentTerms" column="payment_terms_id" not-null="true"/>
<property name="currency" column="currency" type="currency" not-null="true"/>
<property name="freightOnBoard" column="freight_on_board" type="freightOnBoard" not-null="true"/>
<property name="purchaseOrderNumber" column="purchase_order_number" not-null="true"/>
<property name="status" column="purchase_order_status" type="purchaseOrderStatus" not-null="true"/>
<property name="priority" column="purchase_order_priority" type="purchaseOrderPriority" not-null="true"/>
<property name="note" column="note"/>
<property name="approvalDate" column="approval_date"/>
<property name="approvalUser" column="approval_user"/>
<property name="transmittedAt" column="transmitted_at"/>
<set name="lines" cascade="all-delete-orphan" inverse="true">
<key column="purchase_order_id"/>
<one-to-many class="com.mydomain.PurchaseOrderLine" />
</set>
<property name="lineCount" access="field" formula="(select count(*) from purchase_order_line l where l.purchase_order_id = id)"/>
<property name="itemsCount" access="field" formula="(select sum(l.quantity) from purchase_order_line l where l.purchase_order_id = id)"/>
<property name="total" access="field" formula="(select sum(l.extended_purchase_price) from purchase_order_line l where l.purchase_order_id = id)"/>
<property name="updatedAt" column="updated_at"/>
<property name="createdAt" column="created_at"/>
<property name="updatedUser" column="updated_user"/>
<property name="createdUser" column="created_user"/>
</class>
<class name="com.mydomain.PurchaseOrderLine" table="purchase_order_line">
<id name="id" column="id">
<generator class="identity"/>
</id>
<many-to-one name="purchaseOrder" column="purchase_order_id" />
<many-to-one name="purchaseInfo" column="purchase_info_id" />
<property name="quantity" access="field" column="quantity"/>
<property name="purchaseType" column="purchase_type" type="purchaseType"/>
<property name="unitPurchasePrice" access="field" column="unit_purchase_price"/>
<property name="extendedPurchasePrice" access="field" column="extended_purchase_price"/>
<set name="purchaseRequests" cascade="save-update" inverse="true">
<key column="purchase_order_line_id"/>
<one-to-many class="com.mydomain.PurchaseRequest" />
</set>
<property name="dueDate" column="due_date"/>
<property name="updatedAt" column="updated_at"/>
<property name="createdAt" column="created_at"/>
<property name="updatedUser" column="updated_user"/>
<property name="createdUser" column="created_user"/>
</class>
Feel free to point out specific references to Hibernate in Action as I may have missed something that specifically addresses this issue.
Thanks in advance.
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