@Entity
@Table(name = "blog_post")
public class BlogPost extends CommunityModelObject implements HasFeedPost {

    @Lob
    private String title;
    @Lob
    private String content;
    @Enumerated
    @Column(nullable = false)
    private CBlogPost.Status status = CBlogPost.Status.UNPUBLISHED;
    // Reference to the feed post that indicates that this blog post has been published
    @OneToOne
    @JoinColumn(name = "feed_post_id")
    private FeedPost feedPost;
    @ManyToOne
    @JoinColumn(name = "posted_by_employee_id")
    private Employee postedBy;
   
    public String getTitle() {
        return title;
    }

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

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public CBlogPost.Status getStatus() {
        return status;
    }

    public void setStatus(CBlogPost.Status status) {
        this.status = status;
    }

    @Override
    public FeedPost getFeedPost() {
        return feedPost;
    }

    @Override
    public void setFeedPost(FeedPost feedPost) {
        this.feedPost = feedPost;
    }

    public Employee getPostedBy() {
        return postedBy;
    }

    public void setPostedBy(Employee postedBy) {
        this.postedBy = postedBy;
    }
}

@Filter(name = "tenantFilter", condition = "(tenant_id = :tenantId or tenant_id is null)")
@MappedSuperclass
public abstract class CommunityModelObject extends ModelObject {

    @IndexedEmbedded(prefix = "tenant", indexNullAs = IndexedEmbedded.DEFAULT_NULL_TOKEN)
    @ManyToOne
    @JoinColumn(name = "tenant_id")
    protected Tenant tenant;

    public Tenant getTenant() {
        return tenant;
    }

    public void setTenant(Tenant tenant) {
        this.tenant = tenant;
    }

    /**
     * If the Tenant is null then it can be accessed / viewed by the entire "community" / user base
     */
    public boolean isCommunityObject() {
        return tenant == null;
    }
}

@MappedSuperclass
public abstract class ModelObject extends BaseModelObject {

    @Id
    @GeneratedValue
    private Long id;

    @Override
    public long getId() {
        return (id == null ? 0 : id);
    }

    public void setId(long id) {
        this.id = (id == 0 ? null : id);
    }
}

@MappedSuperclass
public abstract class BaseModelObject implements java.io.Serializable {

    // This annotation ensures that a column is not associated with this member (simply omitting the @Column annotation is not enough since
    // that annotation is completely optional)
    @Transient
    private boolean doNotAutoUpdateDateUpdated = false;

    @Version
    protected int version;
    @Column(name = "date_created")
    protected Date dateCreated;
    @Column(name = "date_updated")
    protected Date dateUpdated;

    public abstract long getId();

    public int getVersion() {
        return version;
    }

    public void setVersion(int version) {
        this.version = version;
    }

    public Date getDateCreated() {
        return dateCreated;
    }

    public Date getDateUpdated() {
        return dateUpdated;
    }

    /**
     * This will set the dateUpdated to whatever is passed through and it will cause the auto update (pre-update) to NOT occur
     *
     * @param dateUpdated
     */
    public void setDateUpdated(Date dateUpdated) {
        doNotAutoUpdateDateUpdated = true;
        this.dateUpdated = dateUpdated;
    }

    public void touch() {
        // By setting date updated to null this triggers an update which results in onUpdate being called and the nett
        // result is dateUpdated = new Date()
        dateUpdated = null;
    }

    @PrePersist
    protected void onCreate() {
        dateCreated = new Date();
    }

    @PreUpdate
    protected void onUpdate() {
        if (!doNotAutoUpdateDateUpdated) {
            dateUpdated = new Date();
        }
    }

    @Override
    public boolean equals(Object obj) {
        long id = getId();

        if (id == 0) {
            return this == obj;
        }
        //Use Hibernate.getClass() because objects might be proxies
        return obj != null &&
                obj instanceof BaseModelObject &&
                Hibernate.getClass(this) == Hibernate.getClass(obj) &&
                getId() == ((BaseModelObject)obj).getId();
    }

    @Override
    public int hashCode() {
        Long id = getId();
        return id == 0 ? super.hashCode() : id.intValue();
    }

    @Override
    public String toString() {
        return getClass().getSimpleName() + "-" + getId();
    }
}

select b from BlogPost b

java.lang.NullPointerException
   at org.hibernate.event.internal.DefaultFlushEntityEventListener.isUpdateNecessary(DefaultFlushEntityEventListener.java:240)
   at org.hibernate.event.internal.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:163)
   at org.hibernate.event.internal.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:225)
   at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)
   at org.hibernate.event.internal.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:55)
   at org.hibernate.internal.SessionImpl.autoFlushIfRequired(SessionImpl.java:1153)
   at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1208)
   at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
   at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:256)

public class MySQL5InnoDBDialectExt extends MySQL5InnoDBDialect {

    private static final String BIT_STRING = "bit";

    public MySQL5InnoDBDialectExt() {
        super();
        registerColumnType(Types.BOOLEAN, BIT_STRING);
    }
}

239:               if ( event.getEntityEntry().getPersister().getInstrumentationMetadata().isInstrumented() ) {
240:               event.getEntityEntry()
241:                     .getPersister()
242:                     .getInstrumentationMetadata()
243:                     .extractInterceptor( event.getEntity() )
244:                     .clearDirty();
245:             }