Hi Jon,
No, that should be fine. Can you provide a snippet of the code that are you
executing, that should cause the pre-persist event to be called?
Cheers,
Guy
----- Original Message -----
From: "Jon Miller" <jemiller_at_uchicago.edu>
To: <persistence_at_glassfish.dev.java.net>
Sent: Monday, January 08, 2007 4:08 PM
Subject: Re: PrePersist method not being called
> Guy, yes, I just noticed that preUpdate is called. It's just prePersist
> that isn't being called. Another thing that just occurred to me. I don't
> know if this has anything to do with it or not, but, the Id value for the
> class is implemented in the subclasses, not AuditObject. So, AuditObject
> has a PrePersist method but no Id field. I'm guessing maybe that's it?
> AuditObject is an abstract class.
>
> Jon
>
> ----- Original Message -----
> From: "Guy Pelletier" <guy.pelletier_at_oracle.com>
> To: <persistence_at_glassfish.dev.java.net>
> Sent: Monday, January 08, 2007 12:20 PM
> Subject: Re: PrePersist method not being called
>
>
>> Hi Jon,
>>
>> I noticed there is a pre-update listener on the mapped superclass. Does
>> it ever get called? Is it just the pre-persist that never executes?
>>
>> Cheers,
>> Guy
>>
>> ----- Original Message -----
>> From: "Jon Miller" <jemiller_at_uchicago.edu>
>> To: <persistence_at_glassfish.dev.java.net>
>> Sent: Monday, January 08, 2007 1:00 PM
>> Subject: Re: PrePersist method not being called
>>
>>
>>> Thanks Tom. Yeah, I have all the classes listed there now. It still
>>> isn't working though. I just tried a simpler test with the PrePersist
>>> method in the top level class and it worked. I'll have to look into it
>>> further...
>>>
>>> Thanks for the info on weaving. I recently read about that. So far I
>>> just been doing without it. I figure once I get further along I may need
>>> to enable it if performance is an issue. One thing that I'm wondering
>>> about the agent is: is it possible to somehow enable the agent
>>> programatically in the program itself, or, does it have to be passed as
>>> a command-line argument? I'm using TopLink with Tomcat and not using an
>>> EJB application server. I like the idea of being able to deploy the web
>>> app self-contained without having to make changes to the web server
>>> configuration such as passing command-line arguments to the JVM.
>>>
>>> Jon
>>>
>>> ----- Original Message -----
>>> From: "Tom Ware" <tom.ware_at_oracle.com>
>>> To: <persistence_at_glassfish.dev.java.net>
>>> Sent: Monday, January 08, 2007 8:28 AM
>>> Subject: Re: PrePersist method not being called
>>>
>>>
>>>> Hi Jon,
>>>>
>>>> Are you still seeing the problem now that you have listed AuditObject
>>>> in your persistence.xml?
>>>>
>>>> In Java SE, the JPA specification says that portable applications must
>>>> list the classes that will be used in the persistence.xml either with
>>>> <class> element, by referring to them in a file referenced by a
>>>> <mapping-file> element, or by placing them in a file referenced by a
>>>> <jar-file> element. As a result, in Java SE depending on how your
>>>> persistence.xml looks, we may not automatically discover your classes.
>>>>
>>>> In some Java SE Environments TopLink Essentials will be able to
>>>> auto-discover if you use the <exclude-unlisted-classes> element in your
>>>> persistence.xml and set it to false.
>>>>
>>>> FYI: You have asked a couple of questions about the javaagent, so
>>>> I'll give you an idea what the purpose of the agent is. In TopLink
>>>> Essentials, we use the javaagent to dynamically weave classes that have
>>>> OneToOne or ManyToOne mappings with FetchType LAZY. The weaving allows
>>>> us to actually retrieve the elements referenced by those mappings in a
>>>> LAZY manner. For those that do not wish to use the agent (or cannot
>>>> use it), there is also the option of using a preprocessing step for
>>>> this weaving. If you are interested in that step, take a look at the
>>>> section of the following document entitled, "Static Weaving Using the
>>>> StaticWeave Class on the Command Line":
>>>>
>>>> http://www.oracle.com/technology/products/ias/toplink/jpa/resources/toplink-jpa-extensions.html#LazyLoading
>>>>
>>>> -Tom
>>>>
>>>> Jon Miller wrote:
>>>>
>>>>>I thought I found what might have been the problem on my side. I wasn't
>>>>>listing AuditObject in my persistence.xml. Initially, I was thinking
>>>>>that you only would have to list the subclasses that you are using
>>>>>directly and that it would automatically add in the superclasses for
>>>>>you. I found out that this doesn't appear to be the case though (at
>>>>>least in standalone mode). Another thing worth mentioning is that the
>>>>>AuditObject class is in a different jar file. I'm not sure if that
>>>>>would make a difference or not. There's only one persistence.xml, but,
>>>>>the classes are split between two jar files.
>>>>>
>>>>>Jon
>>>>>
>>>>>----- Original Message -----
>>>>>From: "Jon Miller" <jemiller_at_uchicago.edu>
>>>>>To: <persistence_at_glassfish.dev.java.net>
>>>>>Sent: Friday, January 05, 2007 6:13 PM
>>>>>Subject: Re: PrePersist method not being called
>>>>>
>>>>>
>>>>>
>>>>>>OK, I tested it and it works with Hibernate, but, I receive the
>>>>>>following error with TopLink. The prePersist method is supposed to be
>>>>>>called which sets the lastWriteTime field. This isn't happening, so,
>>>>>>it's causing an exception since that field is NOT NULL.
>>>>>>
>>>>>> [junit] Caused by: Exception [TOPLINK-4002] (Oracle TopLink
>>>>>> Essentials - 9.1 (Build b30)): oracle.toplink.essentials
>>>>>>.exceptions.DatabaseException
>>>>>> [junit] Internal Exception: java.sql.SQLException:
>>>>>> [SKATE\SQLEXPRESS]Cannot insert the value NULL into column 'LastW
>>>>>>riteTime', table 'Schedules.dbo.Person'; column does not allow nulls.
>>>>>>INSERT fails.Error Code: 515
>>>>>> [junit] Call:INSERT INTO Person (Department, CreationUserName,
>>>>>> FirstName, LastName, LastWriteTime, Name, LastWriteUs
>>>>>>erName, MiddleName, TelephoneNumber, Title, CreationTime, Curriculum,
>>>>>>Address, UserName, EmailAddress, Organization, Cla
>>>>>>ss) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
>>>>>> [junit] bind => [null, null, Jonathan, Miller, null, Jonathan
>>>>>> Eric Miller, null, Eric, null, null, null, null, n
>>>>>>ull, jemiller, null, null, Schedules.Persistence.Entity.User]
>>>>>>
>>>>>>Jon
>>>>>>
>>>>>>----- Original Message -----
>>>>>>From: "Jon Miller" <jemiller_at_uchicago.edu>
>>>>>>To: <persistence_at_glassfish.dev.java.net>
>>>>>>Sent: Friday, January 05, 2007 5:47 PM
>>>>>>Subject: Re: PrePersist method not being called
>>>>>>
>>>>>>
>>>>>>
>>>>>>>OK, I tested it with V2 build 30. It still isn't getting called. I'm
>>>>>>>not using the agent at present. Would that matter? I'm wondering if
>>>>>>>the problem is that the PrePersist method is in a MappedSuperclass? I
>>>>>>>think that's a valid thing to do though. I think the Javadocs mention
>>>>>>>it if I remember correctly. I'm going to test it again with
>>>>>>>Hibernate, just to make sure I'm not doing something else wrong and
>>>>>>>that it does indeed work with Hibernate and not TopLink.
>>>>>>>
>>>>>>>Jon
>>>>>>>
>>>>>>>----- Original Message -----
>>>>>>>From: "Tom Ware" <tom.ware_at_oracle.com>
>>>>>>>To: <persistence_at_glassfish.dev.java.net>
>>>>>>>Sent: Thursday, January 04, 2007 2:10 PM
>>>>>>>Subject: Re: PrePersist method not being called
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>Hi Jon,
>>>>>>>>
>>>>>>>> Do you see the same behavior on the latest builds of TopLink
>>>>>>>> essentials (e.g. V2 build 30)? There have been quite a lot of
>>>>>>>> changes since the end of August (060830).
>>>>>>>>
>>>>>>>> You can get the latest version at:
>>>>>>>>
>>>>>>>>https://glassfish.dev.java.net/downloads/persistence/JavaPersistence.html
>>>>>>>>
>>>>>>>>-Tom
>>>>>>>>
>>>>>>>>Jon Miller wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>>Hi all,
>>>>>>>>>
>>>>>>>>>I'm using the version of Toplink Essentials that comes with
>>>>>>>>>NetBeans 5.5. I have a class which defines a PrePersist method
>>>>>>>>>(AuditObject.prePersist()) which sets some values in an object
>>>>>>>>>(namely a timestamp which is a NOT NULL value). I'm finding that
>>>>>>>>>this method isn't being called when I attempt to persist an Item
>>>>>>>>>object (subclass of AuditObject). It works fine if I use
>>>>>>>>>Hibernate's implementation of JPA. Does anyone know what I might be
>>>>>>>>>doing wrong or if this is a known issue? So far I haven't been
>>>>>>>>>using the javaagent. However, I just tried it with the agent to see
>>>>>>>>>if that might be the problem, but, it didn't make a difference. The
>>>>>>>>>following is the exception that I'm receiving.
>>>>>>>>>
>>>>>>>>>Exception [TOPLINK-4002] (Oracle TopLink Essentials - 2006.8 (Build
>>>>>>>>>060830)): oracle.toplink.essentials.exceptions.DatabaseException
>>>>>>>>>Internal Exception: java.sql.SQLException: [SKATE\SQLEXPRESS]Cannot
>>>>>>>>>insert the value NULL into column 'LastWriteTime', table
>>>>>>>>>'ReservationsDev.dbo.Item'; column does not allow nulls. INSERT
>>>>>>>>>fails.Error Code: 515
>>>>>>>>>Call:INSERT INTO Item (Name, CreationUserName, Description,
>>>>>>>>>LastWriteUserName, LastWriteTime, CreationTime) VALUES (?, ?, ?, ?,
>>>>>>>>>?, ?)
>>>>>>>>> bind => [testSaveItem Wed Jan 03 14:43:08 CST 2007, null,
>>>>>>>>> Description, null, null, null]
>>>>>>>>>Query:InsertObjectQuery([id = null, name = "testSaveItem Wed Jan 03
>>>>>>>>>14:43:08 CST 2007", description = "Description"])
>>>>>>>>>javax.persistence.RollbackException: Exception [TOPLINK-4002]
>>>>>>>>>(Oracle TopLink Essentials - 2006.8 (Build 060830)):
>>>>>>>>>oracle.toplink.essentials.exceptions.DatabaseException
>>>>>>>>>Internal Exception: java.sql.SQLException: [SKATE\SQLEXPRESS]Cannot
>>>>>>>>>insert the value NULL into column 'LastWriteTime', table
>>>>>>>>>'ReservationsDev.dbo.Item'; column does not allow nulls. INSERT
>>>>>>>>>fails.Error Code: 515
>>>>>>>>>Call:INSERT INTO Item (Name, CreationUserName, Description,
>>>>>>>>>LastWriteUserName, LastWriteTime, CreationTime) VALUES (?, ?, ?, ?,
>>>>>>>>>?, ?)
>>>>>>>>> bind => [testSaveItem Wed Jan 03 14:43:08 CST 2007, null,
>>>>>>>>> Description, null, null, null]
>>>>>>>>>Query:InsertObjectQuery([id = null, name = "testSaveItem Wed Jan 03
>>>>>>>>>14:43:08 CST 2007", description = "Description"])
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.ejb.cmp3.transaction.base.EntityTransactionImpl.commit(EntityTransactionImpl.java:109)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.ejb.cmp3.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:45)
>>>>>>>>> at
>>>>>>>>> edu.uchicago.at.reservations.ReservationsService.saveItem(ReservationsService.java:254)
>>>>>>>>> at
>>>>>>>>> edu.uchicago.at.reservations.ReservationsServiceTest.testSaveGetAndRemoveItem(ReservationsServiceTest.java:44)
>>>>>>>>>Caused by: Exception [TOPLINK-4002] (Oracle TopLink Essentials -
>>>>>>>>>2006.8 (Build 060830)):
>>>>>>>>>oracle.toplink.essentials.exceptions.DatabaseException
>>>>>>>>>Internal Exception: java.sql.SQLException: [SKATE\SQLEXPRESS]Cannot
>>>>>>>>>insert the value NULL into column 'LastWriteTime', table
>>>>>>>>>'ReservationsDev.dbo.Item'; column does not allow nulls. INSERT
>>>>>>>>>fails.Error Code: 515
>>>>>>>>>Call:INSERT INTO Item (Name, CreationUserName, Description,
>>>>>>>>>LastWriteUserName, LastWriteTime, CreationTime) VALUES (?, ?, ?, ?,
>>>>>>>>>?, ?)
>>>>>>>>> bind => [testSaveItem Wed Jan 03 14:43:08 CST 2007, null,
>>>>>>>>> Description, null, null, null]
>>>>>>>>>Query:InsertObjectQuery([id = null, name = "testSaveItem Wed Jan 03
>>>>>>>>>14:43:08 CST 2007", description = "Description"])
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.exceptions.DatabaseException.sqlException(DatabaseException.java:295)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:639)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.databaseaccess.DatabaseAccessor.executeNoSelect(DatabaseAccessor.java:688)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:477)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:437)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.sessions.AbstractSession.executeCall(AbstractSession.java:675)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.queryframework.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:213)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.queryframework.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:199)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.queryframework.DatasourceCallQueryMechanism.insertObject(DatasourceCallQueryMechanism.java:331)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.queryframework.StatementQueryMechanism.insertObject(StatementQueryMechanism.java:176)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.queryframework.StatementQueryMechanism.insertObject(StatementQueryMechanism.java:190)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.queryframework.DatabaseQueryMechanism.insertObjectForWrite(DatabaseQueryMechanism.java:457)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.queryframework.InsertObjectQuery.executeCommit(InsertObjectQuery.java:74)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.queryframework.DatabaseQueryMechanism.performUserDefinedWrite(DatabaseQueryMechanism.java:635)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.queryframework.DatabaseQueryMechanism.performUserDefinedInsert(DatabaseQueryMechanism.java:599)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.queryframework.DatabaseQueryMechanism.insertObjectForWriteWithChangeSet(DatabaseQueryMechanism.java:495)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.queryframework.WriteObjectQuery.executeCommitWithChangeSet(WriteObjectQuery.java:130)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.queryframework.DatabaseQueryMechanism.executeWriteWithChangeSet(DatabaseQueryMechanism.java:283)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.queryframework.WriteObjectQuery.executeDatabaseQuery(WriteObjectQuery.java:67)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.queryframework.DatabaseQuery.execute(DatabaseQuery.java:609)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.queryframework.DatabaseQuery.executeInUnitOfWork(DatabaseQuery.java:536)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.queryframework.ObjectLevelModifyQuery.executeInUnitOfWorkObjectLevelModifyQuery(ObjectLevelModifyQuery.java:123)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.queryframework.ObjectLevelModifyQuery.executeInUnitOfWork(ObjectLevelModifyQuery.java:95)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2218)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:937)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:894)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.sessions.CommitManager.commitNewObjectsForClassWithChangeSet(CommitManager.java:254)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.sessions.CommitManager.commitAllObjectsWithChangeSet(CommitManager.java:175)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.sessions.AbstractSession.writeAllObjectsWithChangeSet(AbstractSession.java:2638)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.commitToDatabase(UnitOfWorkImpl.java:1030)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.ejb.cmp3.base.RepeatableWriteUnitOfWork.commitToDatabase(RepeatableWriteUnitOfWork.java:357)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.commitToDatabaseWithChangeSet(UnitOfWorkImpl.java:1112)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.ejb.cmp3.base.RepeatableWriteUnitOfWork.commitRootUnitOfWork(RepeatableWriteUnitOfWork.java:82)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.commitAndResume(UnitOfWorkImpl.java:842)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.ejb.cmp3.transaction.base.EntityTransactionImpl.commit(EntityTransactionImpl.java:90)
>>>>>>>>> ... 18 more
>>>>>>>>>Caused by: java.sql.SQLException: [SKATE\SQLEXPRESS]Cannot insert
>>>>>>>>>the value NULL into column 'LastWriteTime', table
>>>>>>>>>'ReservationsDev.dbo.Item'; column does not allow nulls. INSERT
>>>>>>>>>fails.
>>>>>>>>> at com.inet.tds.a.a(Unknown Source)
>>>>>>>>> at com.inet.tds.c.new(Unknown Source)
>>>>>>>>> at com.inet.tds.c.executeUpdate(Unknown Source)
>>>>>>>>> at
>>>>>>>>> oracle.toplink.essentials.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:632)
>>>>>>>>> ... 51 more
>>>>>>>>>
>>>>>>>>>// AuditObject.java
>>>>>>>>>package edu.uchicago.at.common.persistence.entity;
>>>>>>>>>
>>>>>>>>>import java.io.Serializable;
>>>>>>>>>import java.util.Date;
>>>>>>>>>import java.util.logging.Logger;
>>>>>>>>>import javax.persistence.Column;
>>>>>>>>>import javax.persistence.MappedSuperclass;
>>>>>>>>>import javax.persistence.PrePersist;
>>>>>>>>>import javax.persistence.PreUpdate;
>>>>>>>>>import javax.persistence.Temporal;
>>>>>>>>>import javax.persistence.TemporalType;
>>>>>>>>>
>>>>>>>>>@MappedSuperclass
>>>>>>>>>public abstract class AuditObject implements Serializable {
>>>>>>>>> private Date creationTime;
>>>>>>>>> private String creationUserName;
>>>>>>>>> private Date lastWriteTime;
>>>>>>>>> private String lastWriteUserName;
>>>>>>>>> private static Logger logger = Logger.getLogger(
>>>>>>>>> AuditObject.class.getName());
>>>>>>>>>
>>>>>>>>> @Column(name="CreationTime", nullable=false)
>>>>>>>>> @Temporal(TemporalType.TIMESTAMP)
>>>>>>>>> public Date getCreationTime() {
>>>>>>>>> return creationTime;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> public void setCreationTime(Date creationTime) {
>>>>>>>>> this.creationTime = creationTime;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> @Column(name="CreationUserName",
>>>>>>>>> columnDefinition="nvarchar(255)")
>>>>>>>>> public String getCreationUserName() {
>>>>>>>>> return creationUserName;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> public void setCreationUserName(String creationUserName) {
>>>>>>>>> this.creationUserName = creationUserName;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> @Column(name="LastWriteTime", nullable=false)
>>>>>>>>> @Temporal(TemporalType.TIMESTAMP)
>>>>>>>>> public Date getLastWriteTime() {
>>>>>>>>> return lastWriteTime;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> public void setLastWriteTime(Date lastWriteTime) {
>>>>>>>>> this.lastWriteTime = lastWriteTime;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> @Column(name="LastWriteUserName",
>>>>>>>>> columnDefinition="nvarchar(255)")
>>>>>>>>> public String getLastWriteUserName() {
>>>>>>>>> return lastWriteUserName;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> public void setLastWriteUserName(String lastWriteUserName) {
>>>>>>>>> this.lastWriteUserName = lastWriteUserName;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> @PrePersist
>>>>>>>>> public void prePersist() {
>>>>>>>>> Date d = new Date();
>>>>>>>>> setCreationTime(d);
>>>>>>>>> setLastWriteTime(d);
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> @PreUpdate
>>>>>>>>> public void preUpdate() {
>>>>>>>>> Date d = new Date();
>>>>>>>>> setLastWriteTime(d);
>>>>>>>>> }
>>>>>>>>>}
>>>>>>>>>
>>>>>>>>>// Item.java
>>>>>>>>>package edu.uchicago.at.reservations.persistence.entity;
>>>>>>>>>
>>>>>>>>>import edu.uchicago.at.common.persistence.entity.AuditObject;
>>>>>>>>>import java.util.ArrayList;
>>>>>>>>>import java.util.Collection;
>>>>>>>>>import javax.persistence.Column;
>>>>>>>>>import javax.persistence.Entity;
>>>>>>>>>import javax.persistence.GeneratedValue;
>>>>>>>>>import javax.persistence.GenerationType;
>>>>>>>>>import javax.persistence.Id;
>>>>>>>>>import javax.persistence.JoinColumn;
>>>>>>>>>import javax.persistence.JoinTable;
>>>>>>>>>import javax.persistence.ManyToMany;
>>>>>>>>>import javax.persistence.Table;
>>>>>>>>>
>>>>>>>>>@Entity
>>>>>>>>>@Table(name="Item")
>>>>>>>>>public class Item extends AuditObject {
>>>>>>>>> private String description;
>>>>>>>>> private Integer id;
>>>>>>>>> private String name;
>>>>>>>>> private Collection<Reservation> reservations = new
>>>>>>>>> ArrayList<Reservation>();
>>>>>>>>> private Collection<Item> subItems = new ArrayList<Item>();
>>>>>>>>> private Collection<Item> superItems = new ArrayList<Item>();
>>>>>>>>>
>>>>>>>>> public Item() {
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> public Item(String name) {
>>>>>>>>> setName(name);
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> public boolean contains(Item item) {
>>>>>>>>> for(Item i : subItems) {
>>>>>>>>> if (i.id == item.id) {
>>>>>>>>> return true;
>>>>>>>>> }
>>>>>>>>> if (i.contains(item)) {
>>>>>>>>> return true;
>>>>>>>>> }
>>>>>>>>> }
>>>>>>>>> return false;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> @Column(name="Description", columnDefinition="nvarchar(max)")
>>>>>>>>> public String getDescription() {
>>>>>>>>> return description;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> public void setDescription(String description) {
>>>>>>>>> this.description = description;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> @Id
>>>>>>>>> @GeneratedValue(strategy = GenerationType.IDENTITY)
>>>>>>>>> @Column(name="Id")
>>>>>>>>> public Integer getId() {
>>>>>>>>> return id;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> public void setId(Integer id) {
>>>>>>>>> this.id = id;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> @Column(name="Name", columnDefinition="nvarchar(255)")
>>>>>>>>> public String getName() {
>>>>>>>>> return name;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> public void setName(String name) {
>>>>>>>>> this.name = name;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> @ManyToMany(mappedBy="items")
>>>>>>>>> public Collection<Reservation> getReservations() {
>>>>>>>>> return reservations;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> public void setReservations(Collection<Reservation>
>>>>>>>>> reservations) {
>>>>>>>>> this.reservations = reservations;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> @ManyToMany
>>>>>>>>> @JoinTable(name="ItemItem",
>>>>>>>>> joinColumns={_at_JoinColumn(name="ItemId")},
>>>>>>>>> inverseJoinColumns={_at_JoinColumn(name="SubItemId")})
>>>>>>>>> public Collection<Item> getSubItems() {
>>>>>>>>> return subItems;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> public void setSubItems(Collection<Item> subItems) {
>>>>>>>>> this.subItems = subItems;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> @ManyToMany(mappedBy="subItems")
>>>>>>>>> public Collection<Item> getSuperItems() {
>>>>>>>>> return superItems;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> public void setSuperItems(Collection<Item> superItems) {
>>>>>>>>> this.superItems = superItems;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> public String toString() {
>>>>>>>>> StringBuilder sb = new StringBuilder();
>>>>>>>>> sb.append("[");
>>>>>>>>> sb.append(String.format("id = %d", id));
>>>>>>>>> sb.append(String.format(", name = \"%s\"", name));
>>>>>>>>> sb.append(String.format(", description = \"%s\"",
>>>>>>>>> description));
>>>>>>>>> sb.append("]");
>>>>>>>>> return sb.toString();
>>>>>>>>> }
>>>>>>>>>}
>>>>>>>>>
>>>>>>>>>Jon
>>>>>>>>>
>>>>>>>>>
>>>>
>>>
>>
>