StackOverflowError

msirfani · **Posted:** Wed May 05, 2004 4:07 am

Can I map a Set inside a joined-subclass? Is this mapping right?

Code:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
   "-//Hibernate/Hibernate Mapping DTD//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
    <class name="com.domain.ectd.budgets.Budget" table="BPMS_BUDGETS">
       <id name="budgetId" column="BUDGET_ID" length="32" unsaved-value="null">
          <generator class="uuid.hex" />
       </id>
       <property name="budgetType" column="BUDGET_TYPE"/>
       <property name="budgetYear" column="BUDGET_YEAR"/>
      <property name="isApproved" column="IS_APPROVED"/>
      <property name="costType" column="COST_TYPE"/>
      <property name="quarter" column="QUARTER"/>
      <property name="budgetAmount" column="BUDGET_AMOUNT"/>
       <many-to-one name="organisation" column = "ORG_CODE"/>
       <many-to-one name="costElement" column="ELEMENT_ID"/>      
       
      <joined-subclass name="com.domain.ectd.labor.LaborItem" table = "BPMS_LABOR">
         <key column="BUDGET_ID"/>
           <property name="laborCost" column="LABOR_COST"/>
           <property name="laborCount" column="LABOR_COUNT"/>
      </joined-subclass>

      <joined-subclass name="com.domain.ectd.materials.MaterialItem" table = "BPMS_MATERIALS">
         <key column="BUDGET_ID"/>
           <property name="materialCost" column="MATERIAL_COST"/>
            <set name="requirments" cascade="all" inverse="true" lazy="false">
                <key column="REQUIRMENT_ID"/>
                <one-to-many class="com.domain.ectd.requirement.Requirments"/>
            </set>
      </joined-subclass>      

      <joined-subclass name="com.domain.ectd.invoices.InvoiceItem" table = "BPMS_INVOICES">
         <key column="BUDGET_ID"/>
           <property name="invoiceCost" column="INVOICE_COST"/>
            <set name="requirments" cascade="all" inverse="true" lazy="false">
                <key column="REQUIRMENT_ID"/>
                <one-to-many class="com.domain.ectd.requirement.Requirments"/>
            </set>            
      </joined-subclass>
    </class>
</hibernate-mapping>

I am getting StackOverflowError after adding the one-to-many Set named "requirements".

If not, will you please let me know what is the alternative solution for this kind of mapping?

Scott · **Posted:** Wed May 05, 2004 7:09 am

This might be a silly question, but have you mapped the Requirements class? Its not there in the sample code you gave.

Scott

msirfani · **Posted:** Sat May 08, 2004 1:57 am

Scott

Yes, I do have the requirement classed mapped in a seprate file ... here is the mapped file.

Code:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
   "-//Hibernate/Hibernate Mapping DTD//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
    <class name="com.domain.ectd.requirement.Requirments" table="BPMS_REQ_SPECS">
        <id name="requirementId" column="REQUIREMENT_ID" length="32" unsaved-value="null">
            <generator class="uuid.string"/>
        </id>
        <property name="description" column="REQ_DESCRIPTION"/>
        <property name="contractNo" column="REQ_CONTRACT_NO"/>
    </class>
</hibernate-mapping>
<!-- parsed in 0ms -->

In the first place, I want to know whether the mapping is right.

Scott · **Posted:** Sat May 08, 2004 8:23 am

I'm guessing, but strongly, that the problem is that within your MaterialItem class mapping, the 'requirements' set element is marked with inverse="true". This means that Hibernate will not track changes (adds, removes) to the requirements set, because it is expecting that the Requirements class has a reference to the owning MaterialItem and will thus manage the link.

Try adding a property into Requirements that refers back to the owning MaterialItem, and add to the Requirments class mapping a many-to-one element for that property. Alternatively, remove the inverse="true" attribute from the set element .

Scott