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https://issues.apache.org/jira/browse/IBATIS-582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12675305#action_12675305
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Kai Grabfelder commented on IBATIS-582:
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I guess 2.3.4 is affected as well? Fell free to attach a patch against the
trunk for this issue...
> looped result maps is null if all other 'primitive' attributes are null
> -----------------------------------------------------------------------
>
> Key: IBATIS-582
> URL: https://issues.apache.org/jira/browse/IBATIS-582
> Project: iBatis for Java
> Issue Type: Bug
> Affects Versions: 2.3.2, 2.3.3
> Reporter: Andras Linczmayer
>
> If all of the 'primitive' properties of a resultMap are null and it has other
> child resultMap then the child resultMap won't be evaluated therefore the
> result entity will contain corrupt missing data.
> Example:
> <resultMap id="personResult" class="Person" groupBy="id">
> <result property="id" column="person_id" />
> <result property="something" column="something" />
> <result property="defaultDetails" resultMap="Person.personDetailsResult"
> />
> </resultMap>
> <resultMap id="personDetailsResult" class="person.data.HotelDetails">
> <result property="description" column="personDetails_description" />
> <result property="information" column="personDetails_information" />
> <result property="eyeIdentifier"
> resultMap="Person.personEyeIdentifierResult" />
> </resultMap>
> <resultMap id="personEyeIdentifierResult" class="person.data.EyeIdentifier">
> <result property="color" column="eye_color" />
> <result property="size" column="eye_size" />
> <result property="sin" column="eye_sin" />
> </resultMap>
> If personDetails_description, personDetails_information column of appropriate
> ResultSet are SQL null then the eyeIdentifier will be also null despite the
> eye_color, eye_size and eye_sin of the result map are not SQL null.
> The problem is near to the references of
> com.ibatis.sqlmap.engine.scope.StatementScope.rowDataFound.
> Ibatis - instead of implementing the common sense initializing the properties
> by step by step via a recursive solution - splits the initialization into two
> parts: first the primitives types and only after that the class types.
> Unfortunately if all the primitives are null (rowDataFound=false, see
> ResultMap getResult(..) function) then the nested children result maps won't
> be evaluated because of the 'if (statementScope.isRowDataFound())' condition
> of the ResultMap.setNestedResultMappingValue(..) method.
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