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Subject: bug in javabeans setter (ComplexBeanProbe.java)?
Date: Tue, 29 Aug 2006 16:40:37 -0400
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Thread-Topic: bug in javabeans setter (ComplexBeanProbe.java)?
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From: "Adam Klein" <Adam.Klein@aqr.com>
To: <user-java@ibatis.apache.org>
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Apologies if this is posted twice, I don't think my first one made it.

I had implemented defensive copying on my javabean setter methods - ie, =
so the value of the bean would be set to a COPY of the parameter  - =
while the getter would return a direct reference.  Then, when I was =
trying to set keys in an (uninitiailized) HashMap object to values like =
this:

<resultMap id=3D"myResultMap" class=3D"MyClass">
	 <result property =3D myDouble 		column=3D"value0" />
       <result property =3D myHashMap.Key1 	column=3D"value1" />
       <result property =3D myHashMap.Key2 	column=3D"value2" />
</resultMap>

I got a very strange result: of the values in myHashMap, only the value =
of myHashMap.key2 would be set; in general, the first key of an =
(uninitialized) HashMap would never be assigned a value. I traced the =
reason to the ComplexBeanProbe.java file, in the setObject method: it =
called the method setObject(parent, property, child) prior to calling =
setProperty(child, property, value), which meant that the parent.child =
object no longer referenced the child object by the time the code =
attempted to set values on the child object (due specifically to my =
defensive copying).  If myHashMap is initialized to an empty HashMap =
value on creation of MyClass, there are no problems.

The question is, is this just a symptom of defensive copying, or is this =
a bug, where setProperty(child, property, value) should be called first?

Regards,
  Adam
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