LazyInitializationException and PAGE scope

[gregtk]

Hi!
I trying to create administration page for creating gallery. In one of my page I use
rich:fileupload component. But when I upload image and try add it to my Gallery object I catch:

14:45:18,297 WARN  [lifecycle] failed to lazily initialize a collection of role: ru.makingpages.chicago.entity.gallery.Gallery.images, no session or session was closed

This is my Gallery.java:

@Entity
@NamedQueries({
        @NamedQuery(name = "findAllGalleries", query = "select gal from Gallery gal order by gal.date desc")
})
public class Gallery implements Serializable {
    private long id;
    private String title;
    private List<Image> images;
    private Date date;

    @Id
    @GeneratedValue
    public long getId() {
        return id;
    }

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

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    @OneToMany(mappedBy = "gallery", fetch = FetchType.LAZY)
    public List<Image> getImages() {
        return images;
    }

    public void setImages(List<Image> images) {
        this.images = images;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

    @Transient
    public void addImage(Image image) {
        images.add(image);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Gallery gallery = (Gallery) o;

        if (id != gallery.id) return false;
        if (date != null ? !date.equals(gallery.date) : gallery.date != null) return false;
        if (images != null ? !images.equals(gallery.images) : gallery.images != null) return false;
        if (title != null ? !title.equals(gallery.title) : gallery.title != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = (int) (id ^ (id >>> 32));
        result = 31 * result + (title != null ? title.hashCode() : 0);
        result = 31 * result + (images != null ? images.hashCode() : 0);
        result = 31 * result + (date != null ? date.hashCode() : 0);
        return result;
    }
}

This is my Seam Component:

@Name("galleryHome")
@Scope(ScopeType.PAGE)
public class GalleryHome {
    @In
    private EntityManager entityManager;

    @Logger
    Log log;

    private Long galleryId;

    private Gallery instance;

    @RequestParameter
    public void setGalleryId(Long id) {
        galleryId = id;
        if (id != null) {
            try {
                instance = entityManager.find(Gallery.class, id);
            } catch (Exception ex) {
                log.error(ex);
            }

        }
    }

    public Gallery getInstance() {
        return instance;
    }

    public void setInstance(Gallery instance) {
        this.instance = instance;
    }

    public Long getGalleryId() {
        return galleryId;
    }


    public void persist() {
        //To change body of implemented methods use File | Settings | File Templates.
    }

    public void update() {
        entityManager.merge(instance);
    }


    public void processUpload(UploadEvent uploadEvent) {
        try {
            org.richfaces.model.UploadItem item = uploadEvent.getUploadItem();
            ru.makingpages.chicago.entity.gallery.Image uploadedImage = new ru.makingpages.chicago.entity.gallery.Image();
            Image smallImage = buildImage(item.getFile(), 460, 345);
            Image miniImage = buildImage(item.getFile(), 75, 100);
            uploadedImage.setContentType(item.getContentType());
            uploadedImage.setDate(new Date());
            uploadedImage.setSmallImage(smallImage.getImage());
            uploadedImage.setMiniImage(miniImage.getImage());
            instance.addImage(uploadedImage);
            log.info("fileUploaded");
        } catch (Exception ex) {
            log.error(ex);
        }
    }


    private Image buildImage(File file, int width, int height) {
        Image image = new Image();
        try {
            image.setInput(file);
            if (image.getHeight() > image.getWidth())
                image.scaleToHeight(height);
            else
                image.scaleToWidth(width);
        } catch (IOException e) {
            log.error(e);
            return null;
        }
        return image;
    }


}

and my view:

 <h:form id="editForm">
            <div>
                <h:panelGrid columns="1">

                    <ui:define name="label">#{messages['label.title']}</ui:define>
                    <h:inputText id="title" value="#{galleryHome.instance.title}" size="70" required="true"/>
                    <rich:fileUpload fileUploadListener="#{galleryHome.processUpload}"
                                     addControlLabel="#{messages['fileupload.upload']}"
                                     stopControlLabel="#{messages['fileupload.stop']}"
                                     stopEntryControlLabel="#{messages['fileupload.stop']}"
                                     immediateUpload="true"
                                     listHeight="150px"
                                     autoclear="false"
                                     maxFilesQuantity="99"
                                     acceptedTypes="gif, jpeg, jpg, png">
                        <a:support event="onuploadcomplete" reRender="graphics"/>
                    </rich:fileUpload>
                </h:panelGrid>
                <a:outputPanel id="graphics">
                    <ui:repeat var="img" value="#{galleryHome.instance.images}">
                        <s:graphicImage value="#{img.miniImage}"/>

                        <p/>
                    </ui:repeat>
                </a:outputPanel>
            </div>
            <br/>
            <rich:separator/>
           

            <h:commandButton value="#{messages['button.update']}"
                             action="#{galleryHome.update}"/>

        </h:form>

I use JBoss Seam 2.1GA

Please somebody help me :)

[cmoerz.seam.ny-central.org]

I'm not sure if that's really gonna help you, but I once had a problem with some lazy loading exception and what fixed it in my case was the following: I too was using @In to inject my entitymanager, instead I switched to

@PersistenceContext(type=EXTENDED)
EntityManager entityManager;

Then it worked flawlessly. Maybe that'll fix it in your case too. I'm not sure though, since I don't see in your code why the entityManager would want to load something with a name role. It rather looks like you haven't properly set up Seam's identity management?

good luck
chris

[gregtk]

I can't add PersistenceContext annotation because it's plain seam component. thank you for your response :)
Maybe you have more ideas about it :). I triyng convert it's component to EntityHome but it starting throws EntityManager is closed

[cmoerz.seam.ny-central.org]

I didn't really look that close the first time, after quickly browsing through your code snippets I wonder - don't you want to put that into a conversation context? I mean, you're uploading stuff and that should probably be stateful anyways, right?

I'd try going

@Scope(ScopeType.CONVERSATION)
@Stateful

on your GalleryHome. After all you want to manipulate that data across a form submit; I've got a strange feeling that doing what you're trying to do isn't going to work on a stateless bean.

chris