Question

I have encountered a problem since one hour..take me as a beginner please..

The query is very simple :

public List<String> finArticleByfamille(String famille){
EntityManager em = getEntityManager();
Query qr= em.createQuery("SELECT a.libel FROM Article a WHERE a.famille_idfamille =   '"+famille+"'");

return qr.getResultList();
}

also I have tried this :

public List<String> finArticleByfamille(String famille){
EntityManager em = getEntityManager();
Query qr= em.createQuery("SELECT a.libel FROM Article a WHERE a.familleIdfamille =    '"+famille+"'");

return qr.getResultList();
}

“famille_idfamille” is a foreign key from the table “Famille”, see the screenshot:

the error comes from this call:

String famille=famille_produit_fact_direct.getSelectedItem().toString();
l_article=(Vector) ajc.finArticleByfamille(famille);

I get this Error :

Grave: null
java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException: An     exception occurred while creating a query in EntityManager: 
Exception Description: Error compiling the query [SELECT a.libel FROM Article a WHERE    a.famille_idfamille = 'famille2'], line 1, column 38: unknown state or association field   [famille_idfamille] of class [glob.entitys.Article].
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252)
at java.util.concurrent.FutureTask.get(FutureTask.java:111)
at javax.swing.SwingWorker.get(SwingWorker.java:602)
at glob.main$32.done(main.java:2068)
at javax.swing.SwingWorker$5.run(SwingWorker.java:737)

I respected the same name as the database, so why it does not work ?
(sorry for the french language)

Answer 1

@Tim Gage thank you, I just noticed something..
in my entity glob.entitys.Article I have familleIdfamille as field :

 @JoinColumn(name = "FAMILLE_IDFAMILLE", referencedColumnName = "IDFAMILLE", nullable = false)
 @ManyToOne(optional = false)
 private Famille familleIdfamille;

Famille it is another entity..
then it is normal that he does not know famille_idfamille ?

EDIT:

this comment its from the documentation :

• The query string refers to the Employee entity and not to the table
  Employee of the Database…

Then I put this:

Query qr= em.createQuery("SELECT a.libel FROM Article a WHERE  a.familleIdfamille.idfamille = '"+famille+"'");

and its worked;
it is logical that it does not work, because the familleIdfamille is an instance of Famille entity…