conversation???

[constantin.cash]

Instance of User will be saved twice,

service:

@Stateful
@Name("inseract")
public class InserAct implements InserActI{
 @Logger private Log log;

 @In private FacesMessages facesMessages;

 @In private EntityManager entityManager;

 // @In private Context sessionContext;

 @In(required=false) Artikel artikel;

 @In private Identity identity;


 private Kategorie kat;

 private Kategorie ukat;

 private List<Kategorie> ukats;

 private byte[] data;
 private String contentType;
 private String fileName;
 private String title;
 private int size;


 public String weiter(){
 return "/fupload";
 }

 @Remove @Destroy
 public void remove(){

 }

 //@End
 public String upload() {
 Img img = new Img();
 img.setEdata(data);
 img.setEtype(contentType);
 img.setEsize(size);

 User usr = null;
 try{
 usr = (User) entityManager.createQuery("select u from User as u where u.email = :email")
 .setParameter("email",identity.getUsername())
 .getSingleResult();

 artikel.getImgs().add(img);
 img.setArt(artikel);
 artikel.setUsr(usr);
 artikel.setKat(kat);

 //entityManager.merge(artikel);


 usr.getArts().add(artikel);
 artikel = null;
 entityManager.merge(usr);
 usr =null;
 return "/upokay";
 }catch(Exception ex){
 log.error(ex);
 return null;
 }


 }

view:

 <h:form>
 <s:validateAll>
 <table width="800px" cellspacing="3" cellpadding="3">
 <tr style="margin:0px;padding:0px 0px">
 <td style="margin:0px;padding:0px 0px">Titel:</td>
 <td valign="top" class="star">
 <h:inputText id="tit" styleClass="txt" size="30" maxlength="100" value="#{artikel.titel}" required="true"/> *
 <h:message for="tit" styleClass="errors"/>
 </td>
 </tr>
 <tr>

 <td> Kategorie:</td>
 <td valign="top" class="star">
 <a4j:region id="rgs" renderRegionOnly="false">
 <h:selectOneMenu value="#{inseract.kat}" >
 <s:selectItems value="#{sservice.katLIST}" required="true" var="kat" label="#{messages[kat.rkey]}" noSelectionLabel="Bitte wählen..."/>
 <a4j:support event="onchange" reRender="ukats" >
 <s:conversationPropagation type="join" />
 </a4j:support>
 </h:selectOneMenu>
 <h:message for="her" styleClass="errors"/>
 </a4j:region> *
 </td>
 </tr>
 <!--
 <tr>

 <td> Unterkategorie:</td>
 <td valign="top" class="star">
 <s:span id="ukats">
 <h:selectOneMenu id="rgs1" required="true" value="#{inseract.ukat}" >
 <s:selectItems value="#{inseract.ukats}" var="kat" label="#{messages[kat.rkey]}" noSelectionLabel="Bitte wählen..."/>
 </h:selectOneMenu>
 <h:message for="rgs1" styleClass="errors"/>
 </s:span> *
 </td>
 </tr>

 -->



 <tr>

 <td> Hersteller:</td>
 <td valign="top" class="star">
 <h:inputText id="her" styleClass="txt" size="30" maxlength="100" value="#{artikel.hersteller}" required="true"/> *
 <h:message for="her" styleClass="errors"/>
 </td>
 </tr>


 <tr>
 <td valign="top" >Model: </td>

 <td valign="top" class="star">

 <h:inputText id="art" styleClass="txt" size="30" maxlength="100" value="#{artikel.model}" required="true"/> *
 <h:message for="art" styleClass="errors"/>
 </td>
 </tr>
 <tr>

...

 <tr>
 <td colspan="2" align="left">
 <p> <h:commandButton styleClass="button" value="weiter" action="#{inseract.weiter()}" reRender="frm,msg" /></p></td>
 </tr>

model:

@Entity
@Name("usr")
@Table(name="users")
public class User implements java.io.Serializable {

 @Id @GeneratedValue(strategy = GenerationType.AUTO)
 private Long id;

 @NotNull private int anrede;

 @NotNull private String firma;
 private String str;
 private String plz;
 private String ort;

 @Email @NotNull private String email;

 @NotNull @Length(min=6, max=30) private String passwort;

 @OneToMany(mappedBy="usr",cascade = CascadeType.ALL)
 private List<Artikel> arts;

@Entity
@Name("artikel")
@Table(name="artikel")
public class Artikel {
 @Id @GeneratedValue(strategy = GenerationType.AUTO)
 private Long id;

 private String hersteller;

 private String typ;

 private String model;

 private double preis;

 private String titel;

 private double gewicht;

 @NotNull @ManyToOne
 private User usr;

 @NotNull @ManyToOne
 private Kategorie kat;

 @Length(max=1000)
 private String beschreibung;

 private int bs;

 private String standort;

 private boolean activ;

 @OneToMany(mappedBy="art",cascade = CascadeType.ALL)
 private List<Img> imgs;

@Entity
@Name("image")
@Table(name="images")
public class Img {

 @Id @GeneratedValue(strategy = GenerationType.AUTO)
 private Long id;

 @Lob @Basic(fetch=FetchType.LAZY)
 private byte[] edata;

 @NotNull @ManyToOne
 private Artikel art;

 private String etype;

 private int esize;

 @Override

if change the lines in the service to

public String upload() {
 Img img = new Img();
 img.setEdata(data);
 img.setEtype(contentType);
 img.setEsize(size);

 User usr = null;
 try{
 usr = (User) entityManager.createQuery("select u from User as u where u.email = :email")
 .setParameter("email",identity.getUsername())
 .getSingleResult();

 artikel.getImgs().add(img);
 img.setArt(artikel);
 artikel.setUsr(usr);
 artikel.setKat(kat);

 entityManager.merge(artikel);


 //usr.getArts().add(artikel);
 artikel = null;
 //entityManager.merge(usr);
 //usr =null;
 return "/upokay";
 }catch(Exception ex){
 log.error(ex);
 return null;
 }


 }

it does work correctly, if i make away artikel=null, the instance of artiekel and img will saved twice,