I have a
parent child relationship in which the
parent has a collection of children (a set to be specific). The
child collection is setup with cascade="all-delete-orphan". When I initially save the
parent element everything works as expected. However, when I update the
parent and save again, all the children are re-saved.
This behavior leads me to believe that the
parent is losing its reference to the collection of children, and therefore when persisting all the children are re-saved. It seems the only way to fix this is to not use the setter method of this
child collection, but unfortunately this setter is called implicitly in my application (Spring MVC is used to bind a multi-select form element to this collection, and the setter is called by spring on the form submission). Overwriting this setter to not lose the reference (ie, do a colleciton.clear() and collection.addAll(newCollection) rather than collection = newCollection) is apparently a hibernate no-no, as is pointed out here: https://forum.hibernate.org/viewtopic.php?t=956859
Does anyone know how to circumvent this problem? I've posted some of my code below.
The
parent hibernate configuration:
<hibernate-mapping package="org.fstrf.masterpk.domain">
<class name="ReportCriteriaBean" table="masterPkReportCriteria">
<id name="id" column="id">
<generator class="org.hibernate.id.IncrementGenerator" />
</id>
<set name="treatmentArms" table="masterPkTreatmentArms"
sort="org.fstrf.masterpk.domain.RxCodeComparator" lazy="false" cascade="all-delete-orphan" inverse="true">
<key column="runid"/>
<one-to-many class="TreatmentArm"/>
</set>
</class>
</hibernate-mapping>
The
parent object:
public class ReportCriteriaBean{
private Integer id;
private Set<TreatmentArm> treatmentArms;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Set<TreatmentArm> getTreatmentArms() {
return treatmentArms;
}
public void setTreatmentArms(Set<TreatmentArm> treatmentArms) {
this.treatmentArms = treatmentArms;
if(this.treatmentArms != null){
for(TreatmentArm treatmentArm : this.treatmentArms){
treatmentArm.setReportCriteriaBean(this);
}
}
}
The
child hibernate configuration:
<hibernate-mapping package="org.fstrf.masterpk.domain">
<class name="TreatmentArm" table="masterPkTreatmentArms">
<id name="id" column="id">
<generator class="org.hibernate.id.IncrementGenerator" />
</id>
<many-to-one name="reportCriteriaBean" class="ReportCriteriaBean" column="runId" not-null="true" />
<property name="rxCode" column="rxCode" not-null="true"/>
</class>
</hibernate-mapping>
The
child object:
public class TreatmentArm {
private Integer id;
private ReportCriteriaBean reportCriteriaBean;
private String rxCode;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public ReportCriteriaBean getReportCriteriaBean() {
return reportCriteriaBean;
}
public void setReportCriteriaBean(ReportCriteriaBean reportCriteriaBean) {
this.reportCriteriaBean = reportCriteriaBean;
}
public String getRxCode() {
return rxCode;
}
public void setRxCode(String rxCode) {
this.rxCode = rxCode;
}
}
