How can I refresh entities in the following case.
I have a page that contains:
<div class="entry">
| <a4j:log hotkey="M" />
| <a4j:commandButton value="Reload"
reRender="Sensor"/>
| <div class="label">Sensor:</div>
| <div class="input">
| <a4j:region renderRegionOnly="false">
| <h:selectOneMenu id="Sensor"
value="#{messkette.sensor}"
|
converter="#{selectItemHelfer}" required="true" disabled="#{gesperrt}">
| <f:selectItems
value="#{messketteEditor.alleSensorenMitBlank}" />
| <a4j:support
event="onchange" reRender="Funktion, Sensormessbereich, Einheit, Sensorwarnung"
/>
| </h:selectOneMenu>
| </a4j:region>
| <h:message for="Sensor"
styleClass="message" />
| <div><h:outputText id="Sensorwarnung"
value="#{messketteEditor.sensorWarnung}" styleClass="kursiv" /></div>
| </div>
| </div
Sometimes I need to edit or create a entry from database in a second instance
of web browser. So the list in messketteEditor has changed. But when I perform
the Reload commandButton the outcome is the same with no changes.
What I have to do tell the Entitymanger to refresh the list from database.
Here the function that will be executet when a entity is changed or created
public String speichern() {
|
| checkKorrekterAufruf();
|
| if (!vorSpeichern()) {
| ejbCtx.setRollbackOnly();
| return null;
| }
|
| try {
|
| String message = "";
|
| T entity = getEntity();
|
| if (neu) {
| //Neues Entity, anlegen
| em.persist(entity);
| message = angelegtMessage();
| loggeAenderung(getEntity(), "angelegt");
| } else {
| //Bestehendes Entity, Änderungen übernehmen
| setEntity(em.merge(entity));
| message = bearbeitetMessage();
| loggeAenderung(getEntity(), "bearbeitet");
| }
|
| nachSpeichern();System.out.println(entity);
|
| em.flush();
|
| addMessage(message);
|
| } catch (Exception ex) {
| ejbCtx.setRollbackOnly();
| addWarning(speichernError() + " " + exceptionListe(ex));
| System.out.println(ex.getMessage());
| ex.printStackTrace();
|
| return null;
| }
|
| return zurueckOutcome;
| }
and this is the code to return the list
private List<StandardEntity> listeHolen(Class<? extends StandardEntity> klasse,
String where, String order) {
|
| String klassenName = klasse.getName();
|
| String query = "from " + klassenName;
| if (where != null)
| query += " where " + where;
| if (order != null)
| query += " order by " + order;
|
| List<StandardEntity> liste;
|
| try {
| liste = (List<StandardEntity>)
em.createQuery(query).getResultList();
| } catch (Exception ex) {
| //Im Fehlerfall (z.B. nichts gefunden) leere Liste
erzeugen
| ex.printStackTrace();
| liste = new Vector<StandardEntity>();
| }
|
| return liste;
| }
Is there a solution for this case?
Thanks
andi
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