I am getting an exception when trying to save an object that has a unidirectional one-to-one mapping using a primary key association.

The exception is:

Unable to resolve property: person ; nested exception is
org.hibernate.HibernateException: Unable to resolve property: person
org.springframwork.orm.hibernate3.HibernateSystemException: Unable to resolve property: person ; nested exception is
org.hibernate.HibernateException: Unable to resolve property: person
org.hibernarte.HibernateException: Unable to resolve property: person
at org.hibernate.tuple.entity.EntityMetamodel.getPropertyIndex(EntityMetamodel.java:357)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.getPropertyValue(AbstractEntityTuplizer.java:286)
at org.hibernate.tuple.entity.AbstractEntityPersister.getPropertyValue(AbstractEntityPersister.java:3534)
at org.hibernate.id.ForeignGenerator.generate(ForeignGenerator.java:39)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:98)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186)
...

My hbm files look like this:
<class name="Person" table="person">
<id name="id" column="id" unsaved-value="null">
<generator class="native"></generator>
</id>
<property name="name">
</class>

<class name="Member" table="member">
<id name="id" column="id">
<generator class="foreign">
<param name="property"person</param>
</generator>
</id>
<property name="membershipId" column="membership_id" not-null="true" unique="true"></property>
<one-to-one name="person" cascade="all" constrained="true"/>
</class>

My java files look like this:
public class Person extends BaseObject implements Serializable {
private Long id;
private String name;

/**
* @hibernate.id column="id" generator-class="native"
*/
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}

/**
* @hibernate.property
*/
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}


public class Member extends BaseObject implements Serializable {
private Long id;
private Person person = new Person();
private Long membershipId;

/**
* @hibernate.id generator-class="foreign"
* @hibernate.generator-param name="property" value="person"
*/
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}

/**
* @hibernate.one-to-one cascade="all" constrained="true"
*/
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}

/**
* @hibernate.property
*/
public Long getMembershipId() {
return membershipId;
}
public void setMembershipId(Long membershipId) {
this.membershipId = membershipId;
}

My test case looks like this:

public void test1{
Member member = new Member();
member.getPerson().setName("test");
member.setMembershipId(new Long(1));
dao.saveMember(member);
}

I have tried all combinations of cascade and constrained on the one-to-one with no luck. Retrieval of person or member objects seems to work absolutely fine (using data directly inserted into the database); it's only saving objects that causes an exception.

Anyone got any ideas?
Thanks in advance

alan

I too am looking for an solution for this. Does anybody have a solution?

Please use the tags above to make you more readable...

Did you write this in you mapping file???

Maybe that's not the only problem, but it's missing a ">" after "property"...

I encountered this issue as well, however, with the JPA / Hibernate 3.2.4 Core annotations:

The following code allows two tables to share the same primary key and still identify a parent-child relationship. The child entity also uses the primary key as a foreign key to the parent entity.

The code in the child entity references the parent entity (CompanyBean) and has a reference to it:



Unfortunately, the code in the annotations causes the "org.hibernate.HibernateException: Unable to resolve property: company". The @Parameter(...) annotation contains the problem: it is supposed to refer to the field in the child class whose type is the owner of the primary key, in this case, the CompanyBean. The error is the value attribute: changing company to companyBean (the correct name of the field) solves this problem.

Lesson we learned: be cautious with rename refactorings to include textual occurrences.

dan wilkin