Unknown abstract schema type

Question

Based on the answer from axtavt, this is almost certainly a naming problem between Notebean and NoteBean. Is there a particular convention to follow here, just normal CamelCase?

I believe that I've updated the @NamedQuery annotation in the entity and am using those from the controller, and the names look to match, yet I'm still receiving that same error about the schema, which I can't get much information on.

JPA controller:

package net.bounceme.dur.nntp.controller;

import java.util.*;
import java.util.logging.Logger;
import javax.mail.Message;
import javax.persistence.*;
import javax.swing.DefaultListModel;
import net.bounceme.dur.nntp.model.NoteBean;

public class NotesController {

    private static final long serialVersionUID = 1L;
    private static final Logger LOG = Logger.getLogger(NotesController.class.getName());
    private Message message;
    private List<NoteBean> notes = new ArrayList<NoteBean>();
    private DefaultListModel defaultListModel = new DefaultListModel();
    private EntityManagerFactory emf;
    private EntityManager em;
    private String PERSISTENCE_UNIT_NAME = "nntpPU";

    public NotesController() {
        emf = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
        em = emf.createEntityManager();
        LOG.info("entity manager made???" + em.isOpen());
        populateList();
    }

    private void populateList() {
        LOG.info("open?" + em.isOpen());
        em.getTransaction().begin();
        LOG.info("trying to populate.....");
        //Query q = em.createQuery("SELECT n FROM NoteBean n WHERE n.id = :id");
        Query q = em.createNamedQuery("NoteBean.findAll");
        LOG.info(q.toString());
        List results = q.getResultList();
        em.getTransaction().commit();
        setNotes(results);
        DefaultListModel dlm = new DefaultListModel();
        for (NoteBean n : getNotes()) {
            dlm.addElement(n);
        }
        setDefaultListModel(dlm);
    }

    public Message getMessage() {
        return message;
    }

    public void addNote(NoteBean noteBean) {
        LOG.info(noteBean.toString());
        em.getTransaction().begin();
        em.persist(noteBean);
        em.getTransaction().commit();
        populateList();
    }

    public void setMessage(Message message) {
        this.message = message;
    }

    private List<NoteBean> getNotes() {
        return notes;
    }

    private void setNotes(List<NoteBean> notes) {
        this.notes = notes;
    }

    public DefaultListModel getDefaultListModel() {
        return defaultListModel;
    }

    public void setDefaultListModel(DefaultListModel defaultListModel) {
        this.defaultListModel = defaultListModel;
    }
}

entity:

package net.bounceme.dur.nntp.model;

import java.io.Serializable;
import java.util.Date;
import javax.persistence.*;
import javax.xml.bind.annotation.XmlRootElement;

@Entity
@Table(name = "NOTEBEAN", catalog = "nntp", schema = "")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "NoteBean.findAll", query = "SELECT n FROM NoteBean n"),
    @NamedQuery(name = "NoteBean.findById", query = "SELECT n FROM Notebean n WHERE n.id = :id"),
    @NamedQuery(name = "NoteBean.findByStamp", query = "SELECT n FROM Notebean n WHERE n.stamp = :stamp"),
    @NamedQuery(name = "NoteBean.findByNote", query = "SELECT n FROM Notebean n WHERE n.note = :note")
})
public class NoteBean implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @Column(name = "ID", nullable = false)
    private Long id;
    @Column(name = "STAMP")
    @Temporal(TemporalType.DATE)
    private Date stamp;
    @Column(name = "NOTE", length = 255)
    private String note;

    public NoteBean() {
    }

    public NoteBean(Long id) {
        this.id = id;
    }

    public Long getId() {
        return id;
    }

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

    public Date getStamp() {
        return stamp;
    }

    public void setStamp(Date stamp) {
        this.stamp = stamp;
    }

    public String getNote() {
        return note;
    }

    public void setNote(String note) {
        this.note = note;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof NoteBean)) {
            return false;
        }
        NoteBean other = (NoteBean) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "net.bounceme.dur.nntp.model.Notebean[ id=" + id + " ]";
    }
}

run-time error:

init:
Deleting: /home/thufir/NetBeansProjects/SwingNNTP/build/built-jar.properties
deps-jar:
Updating property file: /home/thufir/NetBeansProjects/SwingNNTP/build/built-jar.properties
Compiling 2 source files to /home/thufir/NetBeansProjects/SwingNNTP/build/classes
warning: [options] bootstrap class path not set in conjunction with -source 1.5
Note: /home/thufir/NetBeansProjects/SwingNNTP/src/net/bounceme/dur/nntp/controller/NotesController.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 warning
compile:
run:
May 03, 2012 7:23:05 AM net.bounceme.dur.nntp.PropertiesReader getProps
INFO: NNTP.loadMessages...
May 03, 2012 7:23:06 AM net.bounceme.dur.nntp.controller.MessagesEnum <init>
INFO: starting controller..
[TopLink Info]: 2012.05.03 07:23:10.319--ServerSession(10922033)--TopLink, version: Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))
Exception in thread "AWT-EventQueue-0" Local Exception Stack: 
Exception [TOPLINK-8034] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.EJBQLException
Exception Description: Error compiling the query [NoteBean.findByNote: SELECT n FROM Notebean n WHERE n.note = :note]. Unknown abstract schema type [Notebean].
    at oracle.toplink.essentials.exceptions.EJBQLException.unknownAbstractSchemaType(EJBQLException.java:494)
    at oracle.toplink.essentials.internal.parsing.ParseTreeContext.classForSchemaName(ParseTreeContext.java:163)
    at oracle.toplink.essentials.internal.parsing.SelectNode.getClassOfFirstVariable(SelectNode.java:366)
    at oracle.toplink.essentials.internal.parsing.SelectNode.getReferenceClass(SelectNode.java:354)
    at oracle.toplink.essentials.internal.parsing.ParseTree.getReferenceClass(ParseTree.java:463)
    at oracle.toplink.essentials.internal.parsing.ParseTree.adjustReferenceClassForQuery(ParseTree.java:103)
    at oracle.toplink.essentials.internal.parsing.EJBQLParseTree.populateReadQueryInternal(EJBQLParseTree.java:127)
    at oracle.toplink.essentials.internal.parsing.EJBQLParseTree.populateQuery(EJBQLParseTree.java:108)
    at oracle.toplink.essentials.internal.ejb.cmp3.base.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:219)
    at oracle.toplink.essentials.queryframework.EJBQLPlaceHolderQuery.processEjbQLQuery(EJBQLPlaceHolderQuery.java:111)
    at oracle.toplink.essentials.internal.sessions.AbstractSession.processEJBQLQueries(AbstractSession.java:2059)
    at oracle.toplink.essentials.internal.sessions.AbstractSession.processEJBQLQueries(AbstractSession.java:2046)
    at oracle.toplink.essentials.internal.sessions.DatabaseSessionImpl.postConnectDatasource(DatabaseSessionImpl.java:724)
    at oracle.toplink.essentials.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:604)
    at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:280)
    at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:229)
    at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:93)
    at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:126)
    at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:120)
    at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:91)
    at net.bounceme.dur.nntp.controller.NotesController.<init>(NotesController.java:23)
    at net.bounceme.dur.nntp.gui.Detail.<init>(Detail.java:20)
    at net.bounceme.dur.nntp.gui.NewFrame.initComponents(NewFrame.java:30)
    at net.bounceme.dur.nntp.gui.NewFrame.<init>(NewFrame.java:17)
    at net.bounceme.dur.nntp.gui.NewFrame$2.run(NewFrame.java:62)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
    at java.awt.EventQueue.access$000(EventQueue.java:101)
    at java.awt.EventQueue$3.run(EventQueue.java:666)
    at java.awt.EventQueue$3.run(EventQueue.java:664)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
BUILD SUCCESSFUL (total time: 10 seconds)

Just for reference, mysql console output:

mysql> describe nntp.NOTEBEAN;
+-------+--------------+------+-----+---------+-------+
| Field | Type         | Null | Key | Default | Extra |
+-------+--------------+------+-----+---------+-------+
| ID    | bigint(20)   | NO   | PRI | NULL    |       |
| STAMP | date         | YES  |     | NULL    |       |
| NOTE  | varchar(255) | YES  |     | NULL    |       |
+-------+--------------+------+-----+---------+-------+
3 rows in set (0.00 sec)

mysql> 
mysql> select * from nntp.NOTEBEAN;
Empty set (0.04 sec)

mysql> 

Answer 1

Name of your entity class (and, thusly, default logical name of the entity for use in queries) is NoteBean, whereas stacktrace complains about Notebean.

So, you should use NoteBean instead of Notebean in your queries:

@NamedQuery(name = "Notebean.findById", 
    query = "SELECT n FROM NoteBean n WHERE n.id = :id")