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POHibernate @Version annotation and object references an unsaved transient instance
 

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  1. POHibernate @Version annotation and object references an unsaved transient instance
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    <p>My New Project is in Hibernate 4.2.5.Final and Spring. After Login, I am storing the user object in the session. Now after successful login, I need to insert one record in the application log. Here are the classes:</p> <p>Class BaseEntity </p> <pre><code> @MappedSuperclass public abstract class BaseEntity implements Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private long ID; @Version private Long version; private Long createdBy; @Temporal(value = TemporalType.TIMESTAMP) private Date createdDate; private Long updatedBy; @Temporal(value = TemporalType.TIMESTAMP) private Date updatedDate; private String deactivatedReason; private String activatedReason; private Integer active; public long getID() { return ID; } public void setID(long iD) { ID = iD; } public Long getVersion() { return version; } public void setVersion(Long version) { this.version = version; } public Long getCreatedBy() { return createdBy; } public void setCreatedBy(Long createdBy) { this.createdBy = createdBy; } public Date getCreatedDate() { return createdDate; } public void setCreatedDate(Date createdDate) { this.createdDate = createdDate; } public Long getUpdatedBy() { return updatedBy; } public void setUpdatedBy(Long updatedBy) { this.updatedBy = updatedBy; } public Date getUpdatedDate() { return updatedDate; } public void setUpdatedDate(Date updatedDate) { this.updatedDate = updatedDate; } public String getDeactivatedReason() { return deactivatedReason; } public void setDeactivatedReason(String deactivatedReason) { this.deactivatedReason = deactivatedReason; } public String getActivatedReason() { return activatedReason; } public void setActivatedReason(String activatedReason) { this.activatedReason = activatedReason; } public Integer getActive() { return active; } public void setActive(Integer active) { this.active = active; } } </code></pre> <p>Class Users: </p> <pre><code>package com.product.domain; import javax.persistence.Entity; import javax.persistence.FetchType; import javax.persistence.JoinColumn; import javax.persistence.ManyToOne; import javax.persistence.NamedQueries; import javax.persistence.NamedQuery; import javax.persistence.Table; import javax.validation.constraints.Pattern; import org.hibernate.validator.constraints.Email; import org.hibernate.validator.constraints.NotBlank; import com.product.audit.IAuditLog; import com.product.domain.base.BaseEntity; @Entity @Table(name = "users") @NamedQueries({ @NamedQuery(name = "Users.findUserByUserID", query = "SELECT usr FROM Users as usr WHERE usr.userName = ? and usr.practice.code = ?") }) public class Users extends BaseEntity implements IAuditLog { private String userName; private String password; // bi-directional many-to-one association to Practice @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "practiceID") private Practice practice; //getters and setters } </code></pre> <p>Class ApplicationEvents:</p> <pre><code>package com.product.domain; import java.util.Date; import javax.persistence.CascadeType; import javax.persistence.Entity; import javax.persistence.FetchType; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.ManyToOne; import javax.persistence.Table; import javax.persistence.Temporal; import javax.persistence.TemporalType; @Entity @Table(name = "applicationevents") public class ApplicationEvents { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private long ID; @Temporal(value = TemporalType.TIMESTAMP) private Date eventDate; private String comments; private Integer eventType; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "practiceID") private Practice practice; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "userID") private Users userID; //getters and setters } ApplicationEvents appEvent = new ApplicationEvents(); appEvent.setEventType(eventType); appEvent.setPractice(practice); appEvent.setUserID(userID); appEvent.setComments(comments); appEvent.setEventDate(new Timestamp(new Date().getTime())); CRUDService.Save(appEvent); </code></pre> <p>When I try to save ApplicationEvent, I am getting the following error:</p> <pre><code>18:34:34.540 [http-bio-8080-exec-8] INFO c.p.a.MyUserDetailsService - Logged User authentication sucess. UserName admin and practice Name Physicians Choice Laboratory Hibernate: /* insert com.product.domain.ApplicationEvents */ insert into applicationevents (comments, eventDate, eventType, practiceID, userID) values (?, ?, ?, ?, ?) 19 Sep, 2013 6:34:34 PM org.zkoss.bind.impl.ParamCall call:117 SEVERE: org.springframework.dao.InvalidDataAccessApiUsageException: object references an unsaved transient instance - save the transient instance before flushing: com.product.domain.Users; nested exception is org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.product.domain.Users at org.springframework.orm.hibernate4.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:166) at org.springframework.orm.hibernate4.HibernateTransactionManager.convertHibernateAccessException(HibernateTransactionManager.java:680) at org.springframework.orm.hibernate4.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:562) at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:755) at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:724) at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:475) </code></pre> <p>Very Important Note: When I remove the @Version in the base entity, everything works fine.</p>
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    1. COWhere does the `Users` object come from exactly? If you are pulling the User from the session, at that moment in time it is detached from the persistence context and considered transient. See [Persistence Contexts](http://docs.jboss.org/hibernate/orm/4.2/devguide/en-US/html/ch03.html). You would need to do a `merge` or `saveOrUpdate` on the `Users` object to re-attach it to the persistence context as @Prabhakaran suggests.
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    2. COLet me re-state that... the `Users` object is transient if it is being pulled from the session, not detached. Detached objects are slightly different than transient objects [Working with objects](http://docs.jboss.org/hibernate/orm/4.3/manual/en-US/html/ch11.html).
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    3. COYes User Object is coming from the session and as you said it is in transient state. But i am just wonder, how the problem does not occur when i remove @version in baseentity ? And also i am afraid of saving user object using saveupdate or merge, because we have audit log for each table
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