Stateless EJB 3: update / query on same ejb-method get wrong results

Question

I have a JavaEE application using EJB3 Stateless and DAOs with JDBC statements, simple transfer objects for data.
The EJB business method update some questionnaire structure, after that query on database for new questionnaire (need for get autogenerated ID's on subelements: questions, sections, ...), the ejb-method code look like:
public Questionnaire modifyQuestionnaire(Questionnaire questionnaire) {
   QuestionnaireDAO dao = getQuestionnaireDAO();        
    // Update questionnaire info
   dao.modifyQuestionnaire(questionnaire);
   // Get new info
   Questionnaire newQuestionnaire = dao.getQuestionnaireById(questionnaire.getId());
   return newQuestionnaire;
}The problem is: when invoke "getQuestionnaireById" method on DAO at this time, I get old information ... seems as if UPDATE operations executes on DAO not has been flushed.
After EJB method finish, the information is up to date on physical database, and after that I query the questionnaire using the same DAO "getQuestionnaireById" method, and all is up to date ! ...
When I'm wrong?, I'm using default transaction (required) on ejb, I get the JDBC connection from a DataSource using JNDI lookup to a Container managed connection pool, I close all connection and JDBC resources ... mmm I'm using "executeBatch" for updates/inserts.
My system:
AppServer: SJSAS PE 9
Database: Postgresql 8.1
JDBC Driver: 8.2dev Build 503
O.S.: Linux Ubuntu Dapper Drake
Thanks any help ! .. please.
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Answer 1

There seem a Postgresql JDBC driver problem, I change datasourceclassname from
org.postgresql.ds.PGSimpleDataSource to org.postgresql.xa.PGXADataSource (of course, resource type: javax.sql.XADataSource) and work fine.