I'm using seam 2.0.1.GA and tomcat 6.0.16.

There is one action in session scope

import java.util.List;

import javax.ejb.Stateful;
import javax.persistence.EntityManager;

import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.Factory;
import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Logger;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Out;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.annotations.datamodel.DataModel;
import org.jboss.seam.annotations.datamodel.DataModelSelection;
import org.jboss.seam.annotations.web.RequestParameter;
import org.jboss.seam.faces.FacesMessages;
import org.jboss.seam.log.Log;
import org.jboss.seam.security.Identity;


@Name("deviceaction")
@Scope(ScopeType.SESSION)
public class DeviceAction {

        @Logger
        Log log;

        @In
        private FacesMessages facesMessages;

        @In
        private EntityManager entityManager;

        @DataModel
        private List<Device> devices;

        @DataModelSelection(value="devices")
        private Device device;

    private String searchString;  
    private int pageSize = 10;
    private int page;


        public void persist() {
                log.debug("persisting device instance");
                try {
                        entityManager.persist(device);
                        log.debug("persist successful");
                } catch (RuntimeException re) {
                        log.error("persist failed", re);
                        throw re;
                }
        }


        public void deleteDevice() {
                log.info("delete Object #0", device);
                if (device != null) {
                        devices.remove(device);
                        entityManager.remove(device);
                        entityManager.flush();
                        facesMessages.add("Device " + device.getSnr() + " removed");
                }
        }


        public Device findById(int id) {
                log.debug("getting Configobject instance with id: " + id);
                try {
                        Device instance = entityManager.find(Device.class, id);
                        log.debug("get successful");
                        return instance;
                } catch (RuntimeException re) {
                        log.error("get failed", re);
                        throw re;
                }
        }

        @SuppressWarnings("unchecked")
        public void getAll() {
                log.debug("getting all Configobjects");
                try {
                        devices = entityManager.createQuery("select e from Device e").getResultList();

                } catch (RuntimeException re) {
                        log.error("get failed", re);
                        throw re;
                }
        }

        public void logDevice(){
                log.info("selected device #0", device);
        }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    public int getPage() {
        return page;
    }

    public void setPage(int page) {
        this.page = page;
    }

    public boolean isNextPageAvailable() {
        return (devices != null) && (devices.size() == pageSize);
    }

    public String getSearchString() {
        return searchString;
    }

    public void setSearchString(String searchString) {
        this.searchString = searchString;
    }

    public void nextPage() {
        page++;
        queryEntries();
    }

    public void find() {
        page = 0;
        if (getSearchPattern().length()<3)
                return;
        if (devices != null) {
            devices.clear();
        }
        queryEntries();
    }
    
    @SuppressWarnings("unchecked")
    private void queryEntries() {
        log.info("Querying devices ... #0", getSearchPattern());
        devices = entityManager.createQuery(
                "select e from Device e where lower(e.snr) like #{pattern}" +
                        " or lower(e.mac) like #{pattern}" 
//                 + " and (e.user.name = #{user.name})
                        )
                .setMaxResults(pageSize)
                .setFirstResult(page * pageSize).getResultList();

    }

    @Factory(value = "pattern", scope = ScopeType.EVENT)
    public String getSearchPattern() {
        return (searchString == null) ? "%"
                : ('%' + searchString.toLowerCase().replace('*', '%') + '%');
    }

        public int getPageSize() {
                return pageSize;
        }

        
}

if i click on a link

                        <s:link onclick="return confirmDeletion()" id="deleteEntry" action="#{deviceaction.deleteDevice}">
                            <h:graphicImage value="/img/delete.png" alt="[Delete]" style="border:0"/>
                        </s:link

I get the following

INFO: delete Object Device: 1 dfe asdf
03.04.2008 16:47:27 org.hibernate.event.def.DefaultDeleteEventListener deleteTransientEntity
INFO: handling transient entity in delete processing

why is this object transient? I tried to merge it, but that didnt work either. In this case hibernate tried to insert the object and got an error, because of duplicate key.