The parameter name [...] in the query's selection criteria does not match..

Hi all,
I'm trying to pratice EJB 3 (which I learnt at school), with JSF and JPA, but i'm really stuck with that error :
Exception [TOPLINK-6094] (Oracle TopLink Essentials - 2.0 (Build b41-beta2 (03/30/2007))): oracle.toplink.essentials.exceptions.QueryException
Exception Description: The parameter name [departmentID] in the query's selection criteria does not match any parameter name defined in the query.
Query: ReadAllQuery(oracle.datamodel.Employees)
I will try to explain clearly what i'm trying to do :
In fact, i'm following that tutorial :
http://www.oracle.com/technology/obe/obe1013jdev/10131/ejb_and_jpa/master-detail_pagewith_ejb.htm
But, as i didn't have any oracle database, but had a mysql one on my machine, i decided to use that DB instead of the the oracle DB... So i created a set of example data (to replace the oracle example set) ...so i created the tables EMPLOYEE, and DEPARTMENT... with the correct relations (FK) and PK)
All was ok, i choose my "mysql-connector" (jdbc) instead of the oracle jdbc connector... so i could follow the tutorial.
My problem appears at the step 12 (of "Creating a Master-Detail JavaServer Faces Page"), when i run the file deptEmployees.jspx.
The information of the first departement displays correctly :
departmentID 1
departmentName ... etc
but it can't display the employees belonging to that department !
the error is :
JBO-29000: Exception Description: The parameter name [departmentID] in the query's selection criteria does not match any parameter name defined in the query. Query: ReadAllQuery(oracle.datamodel.Employees)
I think i understand what is the problem... I think that the query in charge of gathering the data of a specific departement need a parameter, but couldn't find it. But i don't know why :-/ I have tried many things and read the topics talking about that error... but it didn't solved the problem. I don't know anymore where to investigate.
I have created a Zip file of my work (it's an EJB/JSF Application.. with jdev 10.1.3.3.0)
(available here : http://dl.free.fr/mQ5esdQuS/EJB_appli.zip)
I would be glad if someone could take few minutes to help me.
Thank you in advance,
Thomas B (student)

Hello,
This is a common mistake. Java string comparisons in TopLink are case sensitive by default, and since column names are uppercase when defaulted, TopLink cannot find the "departmentID" column name. In this case, Departments ID column defaults to "DEPARTMENTID" as required by the JPA specification.
Either change Departments id annotation to     @Id
    @Column(name="departmentID", nullable = false)
    private Integer departmentID;or change Employees' ManytoOne annotation to:
    @ManyToOne
    @JoinColumn(name = "departmentID", referencedColumnName = "DEPARTMENTID")
    private Departments departments;Best Regards,
Chris

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