Validation problem

[Landry Soules]

Hello,

I have a strange problem wit my web app.
From time to time, i get a "ValidationException" when i submit a form.
Here is the trace :
org.apache.cayenne.validation.ValidationException: [v.2.0.2 January 14 2007] 
Validation has failed.
Validation failure for eu.kwark.sql.Performer.toGender: "toGender"  is required.
Validation failure for eu.kwark.sql.Performer.id: "id"  is required.
Validation failure for eu.kwark.sql.Performer.firstName: "firstName"  is 
required.
Validation failure for eu.kwark.sql.Performer.dob: "dob"  is required.
Validation failure for eu.kwark.sql.Performer.lastName: "lastName"  is required.
    at 
org.apache.cayenne.access.ObjectStoreGraphDiff.validateAndCheckNoop(ObjectStoreGraphDiff.java:112)
    at 
org.apache.cayenne.access.DataContext.flushToParent(DataContext.java:1209)
    at 
org.apache.cayenne.access.DataContext.commitChanges(DataContext.java:1130)
    at 
eu.kwark.inscription.InscriptionPerformer$1.onSubmit(InscriptionPerformer.java:88)



Here is the code executed in my submit :

tmpPerformer = (Performer) context.newObject(Performer.class);
...
context.commitChanges();



Of course all these fields are filled !

Please can someone help me, or at least give me a hint about where i can 
search to solve my problem ?

Thanks

Landry