I have a basic model called "Group" which has a name, a reference to its
parent (which is also a Group) and a collection of its children (which are
Groups). I've defined the hibernate mapping like so:
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public Long getId()
{
return id;
}
@ManyToOne
@JoinColumn(name="group_fk", nullable=true, insertable=false,
updatable=false)
public Group getParent()
{
return parent;
}
@OneToMany(cascade = {CascadeType.ALL}, fetch=FetchType.LAZY)
@JoinColumn(name="group_fk")
public Collection<Group> getChildren()
{
return children;
}
When I try to save a Group using my DAO I get the following exception:
org.springframework.orm.hibernate3.HibernateSystemException:
IllegalArgumentException occurred calling getter of
com.trace.model.Group.id; nested exception is
org.hibernate.PropertyAccessException: IllegalArgumentException occurred
calling getter of com.trace.model.Group.id
Caused by: org.hibernate.PropertyAccessException: IllegalArgumentException
occurred calling getter of com.trace.model.Group.id
at
org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:171)
....
....
....
Caused by: java.lang.IllegalArgumentException: object is not an instance of
declaring class
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:145)
Any help or hints would be greatly appreciated. Thanks in advance.
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