[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2254) A query validation bug produces QueryException: "Expected positional parameter count: 1, actual parameters: [Parent at bec357b] [from Child this where this.id.parent = ?]"

[Hernan Liendo (JIRA)]

A query validation bug produces QueryException: "Expected positional parameter count: 1, actual parameters: [Parent at bec357b] [from Child this where this.id.parent = ?]"
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         Key: HHH-2254
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2254
     Project: Hibernate3
        Type: Bug

  Components: query-hql  
    Versions: 3.2.0.ga    
 Environment: Hibernate 3.2 using Sybase. However this is not an environment caused problem. It's supposed to happen in every environment.
    Reporter: Hernan Liendo


-- Short description ============================================================================ --

A query validation bug produces QueryException: "Expected positional parameter count: 1, actual parameters: [Parent at bec357b] [from Child this where this.id.parent = ?].
Both Parent and Child use composite keys.



-- Context ====================================================================================== --
Having composite keys for a Parent class and a Child class, I want to retrieve childs that belong to an specific Parent.



-- Parent Definition ============================================================================ --

public class Parent {

    public ParentId ParentId;

	...
}


public class ParentId {

    private String idField1;
    private int idField2;

	...
}


// the parent mapping

<hibernate-mapping>
  <class mutable="false" table="xx" name="Parent">
    <composite-id class="ParentId" access="field" name="parentId">
      <key-property column="idField1" access="field" name="idField1"/>
      <key-property column="idField2" access="field" name="idField2"/>
    </composite-id>
  </class>
</hibernate-mapping>



-- Child Definition ============================================================================ --

public class Child {

    public ChildId childId;

	...
}


public class ChildId {

    public Parent parent;
    public String aditionalIdField;

	...
}


// the mapping
<hibernate-mapping>
  <class mutable="false" table="yyy" name="Child">
    <composite-id class="ChildId" access="field" name="childId">
        <key-many-to-one name="parent" class="Parent" access="field">
            <column name="idField1" not-null="true" />
            <column name="idField2" not-null="true" />
        </key-many-to-one>
      <key-property column="aditionalIdField" access="field" name="aditionalIdField"/>
    </composite-id>
  </class>
</hibernate-mapping>



-- HQL Statement ============================================================================ --

from Child this where this.childId.parent = ?

or

from Child this where this.id.parent = ?	// using aliased id


-- The Exception ============================================================================ --

org.hibernate.QueryException: Expected positional parameter count: 1, actual parameters: [Parent at bec357b] [from Child this where this.childId.parent = ?]
	at org.hibernate.impl.AbstractQueryImpl.verifyParameters(AbstractQueryImpl.java:319)
	at org.hibernate.impl.AbstractQueryImpl.verifyParameters(AbstractQueryImpl.java:275)
	at org.hibernate.impl.QueryImpl.list(QueryImpl.java:75)
	...

-- The Problem ============================================================================ --

class: org.hibernate.impl.AbstractQueryImpl
method: protected void verifyParameters(boolean reserveFirstParameter) throws HibernateException
line: 286


The method validates parameters. It resolves the "positionalValueSpan" variable witch in my case gets the value of 2 (One for parent's idField1 and the other for parent's idField2).

The method compares positionalValueSpan (2) with parameterMetadata.getOrdinalParameterCount() witch it is 1 (the quantity of "?" signs in the HQL statement".

This bug only happens when:

1. composed keys are used (and)
2. having a parent-child relationship (and)
3. resolving children from certain parent.


-- Hibernate user workaround ============================================================================ --

Not to use a parent instance variable in the Child class.


Hope this helps. If you guys need the source code in order to check the bug, please let me know it. Good luck!
Hernan


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