hibernate-devel

[Phillip B. <phi...@cl...>]

Gidday all,

I'm having endless problems trying to do what I thought would be a 
no-brainer exercise with a Component property.

Basically my classes are like the Person -> Name compoent example in the 
tutorial doc.  I have a Listing class which contains a PhoneNumber 
property.  PhoneNumber simply has four String properties which are 
mapped to the Listing class's table.  So my mapping looks like this...

  <class name="phonebook.model.Listing" table="Listing" select="distinct">
    <id name="UID" type="long" column="UID">
      <generator class="hilo.long"/>
    </id>
    <property name="name" column="name" type="string"/>
    <component name="businessNumber" class="phonebook.model.PhoneNumber">
        <property name="countryCode" column="countryCode" type="string"/>
        <property name="areaCode" column="areaCode" type="string"/>
        <property name="phoneNumber" column="phoneNumber" type="string"/>
        <property name="extension" column="extension" type="string"/>
    </component>

If I try to save a Listing the following exception is thrown...

java.lang.NullPointerException
        at java.lang.reflect.Method.invoke(Native Method)
        at 
cirrus.hibernate.type.ComponentType.getPropertyValue(ComponentType.java:152)
        at 
cirrus.hibernate.type.ComponentType.getValues(ComponentType.java:171)
        at 
cirrus.hibernate.impl.RelationalDatabaseSession.nullifyTransientReferences(RelationalDatabaseSession.java:527)
        at 
cirrus.hibernate.impl.RelationalDatabaseSession.nullifyTransientReferences(RelationalDatabaseSession.java:517)
        at 
cirrus.hibernate.impl.RelationalDatabaseSession.save(RelationalDatabaseSession.java:484)
        at 
cirrus.hibernate.impl.RelationalDatabaseSession.save(RelationalDatabaseSession.java:434)
        at phonebook.model.ListingFactory.save(ListingFactory.java:125)

This exception is being caused because Listing.getBusinessNumber() is 
returning a null.  Ok so I thought I'd work around the problem by 
initialising the property in the default constructor.  That worked.   
Now the Listing could be saved.  Tried deleting it next using 
session.delete("FROM listing IN CLASS phonebook.model.Listing") and got 
the following similar exception...

java.lang.NullPointerException
        at java.lang.reflect.Method.invoke(Native Method)
        at 
cirrus.hibernate.type.ComponentType.getPropertyValue(ComponentType.java:152)
        at 
cirrus.hibernate.type.ComponentType.getValues(ComponentType.java:171)
        at 
cirrus.hibernate.impl.RelationalDatabaseSession.nullifyTransientReferences(RelationalDatabaseSession.java:527)
        at 
cirrus.hibernate.impl.RelationalDatabaseSession.nullifyTransientReferences(RelationalDatabaseSession.java:517)
        at 
cirrus.hibernate.impl.RelationalDatabaseSession.delete(RelationalDatabaseSession.java:590)
        at 
cirrus.hibernate.impl.IdentifierIterator.remove(IdentifierIterator.java:116)
        at 
cirrus.hibernate.impl.RelationalDatabaseSession.delete(RelationalDatabaseSession.java:669)
        at 
cirrus.hibernate.impl.RelationalDatabaseSession.delete(RelationalDatabaseSession.java:651)
        at phonebook.model.ListingFactory.deleteAll(ListingFactory.java:67)

Running up the debugger I could see the Iterator was returning the 
Listing that had been saved.  As documented in the tutorial doc, because 
all the PhoneNumber properties were blank, the businessNumber property 
ended up being set to null when loaded.  This then resulted in same 
exception as when saving.

So after all that my question is - is this a bug?  How should null 
Component properties be handled?

thanks

PhillipB