Hello,

Before I start out with my question I would like to tell you upfront that I am quite new to Seam/EJB3/JSF, I am certain that parts of my question will be a little offtopic with regards to the forum topic. However I did actually search the net and did not really find a solution: most of the information was outdated (old examples for JSF1) or did not describe something along the lines I wanted to do. So far for the disclaimer ;-)

Software used:

I am trying to setup an application with generates lists of allowed chemicals for inland vessels. These lists are multilingual, eg a list can be generated in several languages.

The chemical entity looks like this:

@Entity
public class Chemical implements Serializable {
 private static final long serialVersionUID = -81501463360195381L;

 private int id;
 private int un;

 private int maxFillRate;
 private boolean allowPumpRoom;
 private TemperatureClass temperatureClass;
 private boolean explosionProtection;
 private double density;
 private String classification;
 private int relievePressure;

 private Date updated;
 private User updatedby;

 private String classificationCode;
 private String packageGroup;

 private int bluelights;

 transient private boolean removed;
 transient private Vector<String> removedBy = new Vector<String>();

 private Set<ChemicalNote> notes;
 private Set<Compatibility> compatibility;
 private Set<Danger> dangers;
 private Set<Equipment> equipment;

 private SamplingDevice samplingDevice;

 private Set<Translation> translations;

 // getters and setters
}

I will focus on the translations part, which is the part I am having trouble with.

@Entity
public class Translation implements Serializable {

 private static final long serialVersionUID = 3885895866444687204L;

 private int id;

 private Chemical chemical;
 private String name;
 private String language;

 private User updatedby;
 private Date updated;

}

On the page showing the list of chemicals I would like to show the translation for the name of the chemical. There is a very basic backingbean:

@Name("chemical")
@Scope(CONVERSATION)
@Stateful
public class ChemicalAction implements Serializable, ChemicalInterface {
 private static final long serialVersionUID = -5723276978457496053L;

 @PersistenceContext
 EntityManager em;

 @Logger
 Log log;

 @In
 FacesContext facesContext;

 public java.util.List<Chemical> getChemicals() {

 java.util.List<Chemical> chemicals =
 em.createQuery("select c from Chemical c order by c.un").getResultList();

 return chemicals;
 }

 ...
}

and a little snippet of the xhtml page:

 <ui:repeat value="#{chemical.chemicals}" var="c">
 #{c.id} - #{c.un} - <ui:repeat value="#{c.translations}" var="t">#{t.name}</ui:repeat> <br />
 </ui:repeat>

As you can see I try to loop through all the chemicals (which works) and also through all the translations (which does not work - it generates "Property 'name' not found on type org.hibernate.collection.PersistentSet").

Well the question boils down to: How can I select just one item from a java.util.Set based on the current locale?

Additional questions could be:


If additional information is needed, I will be happy to provide it. Thanks in advance.