Seam 1.3.0.ALPHA UI example doubt

[fernando_jmt]

I lost a lot of time trying to find out the reason for the problem I described here:
http://www.jboss.com/index.html?module=bb&op=viewtopic&t=110611
(Problem of UnsupportedOperationException when using @ManyToMany and <s:convertEntity/>)

I tried a lot of things (debug, simplify my code, with EJB, with POJO) but I did not found the reason.
Well I do the following in order to show you the problem, and maybe you can tell me what is happening:

a) I have got Seam 1.3.0.ALPHA

b) I check UI example has the right enviroment I want to test (@ManyToMany between Person and Colour).

c) I deployed it to Jboss 4.2.0.GA and all work fine. Note that s:selectItems sample uses Seam Framework.

d) I made a POJO action component in the UI example, it looks like:

@Name("personAction")
@Scope(ScopeType.CONVERSATION)
public class PersonAction {

 @In(create=true)
 private EntityManager entityManager;

 private Person person;

 private Integer id;


 @Transactional
 public String update() {
 entityManager.joinTransaction();
 entityManager.merge(person);
 entityManager.flush();
 return "Success";
 }

 public Person getInstance() {
 if (person != null) {
 return person;
 } else {
 entityManager.joinTransaction();
 person = entityManager.find(Person.class, id);
 return person;
 }
 }

 public Integer getId() {
 return id;
 }

 public void setId(Integer id) {
 this.id = id;
 }

}

e) I created a selectItemsAction.xhtml based on selectItems.xhtml, it looks like:

<h:form>

 <s:decorate template="decorateField.xhtml">
 <ui:define name="label">Favourite Colours</ui:define>
 <ui:define name="description">A colour is an entity</ui:define>
 <h:selectManyListbox value="#{personAction.instance.favouriteColours}" >
 <s:selectItems value="#{colours.resultList}" var="colour" label="#{colour.name}" />
 <s:convertEntity />
 </h:selectManyListbox>
 </s:decorate>

 <h:commandButton value="Apply" action="#{personAction.update}">
 <s:conversationPropagation type="join" />
 </h:commandButton>

 <h:messages globalOnly="true" />
 <p><s:link view="/index.xhtml" propagation="end">Back to index</s:link></p>
 </h:form>

f) Minor changes:
pages.xml

<page view-id="/selectItemsAction.xhtml">
 <begin-conversation join="true"/>
 <param name="personId" converterId="javax.faces.Integer" value="#{personAction.id}" />
 </page>

template.xhtml (link to start the update process, exactly like selectItems):

<li><s:link view="/selectItemsAction.xhtml" propagation="join">
 <code>s:selectItems POJO Action</code>
 <f:param name="personId" value="1" />
 </s:link></li>

g) I just deploy again and trying selectItemsAction.xhtml it does not work, it gives UnsupportedOperationException (stacktrace is in the post I put at the beginning of this post) .



Now, my question is why POJO action which I added to UI example does not work?

What am I doing wrong?

As I tell you before, this also does not work using EJB(my case), and this only happens with Seam 1.3.0.ALPHA, because it works fine in Seam 1.2.1. And as I tell above, it works with Seam Framework.


Please help me, at this time I don't know how to solve this.


Thanks in advance.

[pmuir]

Using a managed rather than detached entity causes the UOE to go away.

@Name("personAction")
@Scope(ScopeType.CONVERSATION)
public class PersonAction {

 @In(create=true)
 private EntityManager entityManager;

 private Person person;

 private Integer id;


 @Transactional
 public String update() {
 entityManager.joinTransaction();
 //entityManager.merge(person);
 entityManager.flush();
 return "Success";
 }

 @Transactional
 public Person getInstance() {
 if (person != null && entityManager.contains(person)) {
 return person;
 } else {
 entityManager.joinTransaction();
 person = entityManager.find(Person.class, id);
 return person;
 }
 }

 public Integer getId() {
 return id;
 }

 public void setId(Integer id) {
 this.id = id;
 }

}