Question

i have implemented the following picklist:

<p:pickList id="pickList" value="#{reportConfiguratorBean.dualListVars}" var="cRVariable" itemValue="#{cRVariable}" itemLabel="#{cRVariable.varName}" converter="#{cRImageTypeConverter}" immediate="true" rendered="true" >
    <f:facet name="sourceCaption">Available Variables</f:facet>
    <f:facet name="targetCaption">Associated Variables</f:facet>                
</p:pickList>                       
<f:facet name="footer"> 
    <p:commandButton id='varassociate' action="#{reportConfiguratorBean.setAssocImTypVariables()}" value='Associate' process="@this,pickList" />
</f:facet>

Picklist is populated correctly (using getAssocImTypVariables() from database). But my ISSUE is that i can not capture the changed picklist values of a user alters the source and target lists. I am trying to capture the changes using a commandButton method “setAssocImTypVariables” as follows:

public void setAssocImTypVariables() {      
    System.out.println(">>>>>>>>>>>>>>> entered");          
    List<CRVariable> sourceVariables = this.dualListVars.getSource();
    List<CRVariable> targetVariables = this.dualListVars.getTarget();       

    System.out.println(dualListVars.getSource());
    System.out.println(dualListVars.getTarget());

    for (CRVariable sourceVariable:sourceVariables) {
        System.out.println(">>>>>>>>>>>>> I am a source variable: " + sourceVariable.getVarName());
    }       
    for (CRVariable targetVariable:targetVariables) {
        System.out.println(">>>>>>>>>>>>> I am a target variable: " + targetVariable.getVarName());
    }       
    }

So if for example i have a picklist with INITIAL source = (Obj1,Obj2,Obj3,Obj5,Obj7) and target = (Obj4,Obj6), i move “Obj1” from source to target BUT in my console i get:

——— entered
[]
[]

So my dualListVars (source and target) is not populated! I have two empty lists for source and target…

So my method CAN NOT perceive picklist’s changes… Any ideas?
I am new to java + primefaces so it could be something really fundamental 🙁

I am also attaching the method getAssocImTypesOnLoad():

public void getAssocImTypesOnLoad() {               
    Long imTypeId = Long.parseLong(virtualId);      
    List<CRVariable> source;
    List<CRVariable> target;        
    Session session = HibernateUtil.getSessionFactory().openSession();
    Transaction tx = null;      
    try 
    {
        tx = session.beginTransaction();            
        String hq3 = "select distinct v from CRVariable v join v.crimagetypes t where t.id in (:itid)";
        Query query3 = session.createQuery(hq3);
        query3.setParameter("itid",imTypeId);
        target = query3.list();
        String hq4 = "select v FROM CRVariable v WHERE v.id not in (" +
                "select distinct v1.id " +
                "from CRVariable v1 " +
                "join v1.crimagetypes t2 " +
                "where t2.id in (:itid))";
        Query query4 = session.createQuery(hq4);
        query4.setParameter("itid",imTypeId);
        source = query4.list();
        dualListVars = new DualListModel<CRVariable>(source, target);
        tx.commit();
    } 
    catch (Exception e) 
    {
        if (tx != null) 
        {
            e.printStackTrace();
        }
    } 
    finally 
    {
       session.close();
    }
}

Answer 1

Why are you using immediate=true attribute on the commandButton?

If I remember it correctly, according to an article from balusC
check it out here an immediate=true on a commandButton should skip the apply model to values phase.

Maybe that is the reason, why your model is not updated?

(Just a guess by looking at the code – I have not reproduced this.)