title: @LastModifiedDate causes additional update in database
body: <p>It is kind of strange, but when @LastModifiedDate annotation is used on my entity, it fires additional update on saving new object.<br>
  If I set @EnableJpaAuditing(modifyOnCreate = false), then it is only insert, but last modified date is not set while saving new entity.</p>
  
  <p>Is there a way to make it set last modified date while inserting, without firing extra update to database or am i missing something?</p>
  
  <p>Here is my code:</p>
  
  <pre><code>@Configuration
  @EnableTransactionManagement
  @EnableJpaRepositories
  @EnableJpaAuditing(auditorAwareRef = "auditorProvider")
  public class JpaConfig {
  
      @Bean
      public AuditorAware&lt;String&gt; auditorProvider() {
          return () -&gt; System.getProperty("user.name", "undefined");
      }
  }
  </code></pre>
  
  <p>Abstract entity with getters (working with getters as i am using them elsewhere for Hibernate):</p>
  
  <pre><code>@MappedSuperclass
  public abstract class AbstractGenericJson extends GenericJson {
  
      private DateTime createdDate;
      private DateTime lastModifiedDate;
      private String createdBy;
      private String lastModifiedBy;
  
      @Column(name = "audit_create_ts", nullable = false, updatable = false)
      @CreatedDate
      @Convert(converter = JodaDateTimeConverter.class)
      public DateTime getCreatedDate() {
          return createdDate;
      }
  
      public void setCreatedDate(DateTime createdDate) {
          this.createdDate = createdDate;
      }
  
      @Column(name = "audit_update_ts")
      @LastModifiedDate
      @Convert(converter = JodaDateTimeConverter.class)
      public DateTime getLastModifiedDate() {
          return lastModifiedDate;
      }
  
      public void setLastModifiedDate(DateTime lastModifiedDate) {
          this.lastModifiedDate = lastModifiedDate;
      }
  
      @Column(name = "audit_user_tx", updatable = false)
      @CreatedBy
      public String getCreatedBy() {
          return createdBy;
      }
  
      public void setCreatedBy(String createdBy) {
          this.createdBy = createdBy;
      }
  
      @Column(name = "audit_upd_user_tx")
      @LastModifiedBy
      public String getLastModifiedBy() {
          return lastModifiedBy;
      }
  
      public void setLastModifiedBy(String lastModifiedBy) {
          this.lastModifiedBy = lastModifiedBy;
      }
  ...
  </code></pre>
  
  <p>Entity class</p>
  
  <pre><code>@Entity
  @EntityListeners(AuditingEntityListener.class)
  public class ConsumerInteraction extends AbstractGenericJson {
      private UUID uuid;
  
      @Id
      @GeneratedValue
      @Column(name = "uuid")
      public UUID getId() {
          return uuid;
      }
  ...
  </code></pre>
  
  <p>Repo:</p>
  
  <pre><code>@Repository
  public interface InteractionRepo extends JpaRepository&lt;ConsumerInteraction, UUID&gt;{}
  </code></pre>
  
  <p>My test:</p>
  
  <pre><code>@SpringBootTest(
          properties = {
                  "spring.jpa.properties.hibernate.jdbc.time_zone=UTC",
                  "logging.level.org.springframework.data.auditing=DEBUG"
          })
  @RunWith(SpringRunner.class)
  @DataJpaTest
  @Import(JpaConfig.class)
  public class InteractionRepoTest {
  
      @Autowired
      InteractionRepo dao;
  
      @Test
      public void testInsertSingle() {
          ConsumerInteraction i = new ConsumerInteraction();
          i.setCustomId(290050);
  
          i = dao.save(i);
          dao.flush();
      ...
  </code></pre>
  
  <p>And the log, which shows two Touched events, one for null uuid and then one more after uuid generated, which as i understand is the cause of subsequent update as no other fields have been modified.</p>
  
  <pre><code>2018/05/06 00:36:01 DEBUG | main | o.s.d.a.AuditingHandler:161 - Touched ConsumerInteraction{uuid=null, id=290050} - Last modification at java.util.GregorianCalendar[time=1525563361086,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Europe/London",offset=0,dstSavings=3600000,useDaylight=true,transitions=242,lastRule=java.util.SimpleTimeZone[id=Europe/London,offset=0,dstSavings=3600000,useDaylight=true,startYear=0,startMode=2,startMonth=2,startDay=-1,startDayOfWeek=1,startTime=3600000,startTimeMode=2,endMode=2,endMonth=9,endDay=-1,endDayOfWeek=1,endTime=3600000,endTimeMode=2]],firstDayOfWeek=2,minimalDaysInFirstWeek=4,ERA=1,YEAR=2018,MONTH=4,WEEK_OF_YEAR=18,WEEK_OF_MONTH=1,DAY_OF_MONTH=6,DAY_OF_YEAR=126,DAY_OF_WEEK=1,DAY_OF_WEEK_IN_MONTH=1,AM_PM=0,HOUR=0,HOUR_OF_DAY=0,MINUTE=36,SECOND=1,MILLISECOND=86,ZONE_OFFSET=0,DST_OFFSET=3600000] by xxx 
  2018/05/06 00:36:05 DEBUG | main | o.s.d.a.AuditingHandler:161 - Touched ConsumerInteraction{uuid=4e38645b-aa13-435d-8416-4bb3792a2482, id=290050} - Last modification at java.util.GregorianCalendar[time=1525563365716,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Europe/London",offset=0,dstSavings=3600000,useDaylight=true,transitions=242,lastRule=java.util.SimpleTimeZone[id=Europe/London,offset=0,dstSavings=3600000,useDaylight=true,startYear=0,startMode=2,startMonth=2,startDay=-1,startDayOfWeek=1,startTime=3600000,startTimeMode=2,endMode=2,endMonth=9,endDay=-1,endDayOfWeek=1,endTime=3600000,endTimeMode=2]],firstDayOfWeek=2,minimalDaysInFirstWeek=4,ERA=1,YEAR=2018,MONTH=4,WEEK_OF_YEAR=18,WEEK_OF_MONTH=1,DAY_OF_MONTH=6,DAY_OF_YEAR=126,DAY_OF_WEEK=1,DAY_OF_WEEK_IN_MONTH=1,AM_PM=0,HOUR=0,HOUR_OF_DAY=0,MINUTE=36,SECOND=5,MILLISECOND=716,ZONE_OFFSET=0,DST_OFFSET=3600000] by xxx 
  Hibernate: insert into tInteraction (audit_user_tx, audit_create_ts, audit_upd_user_tx, audit_update_ts, average_value, company_names, consumer, contract_id, id, description, desk, duration, ext_party_id, include_in_vote, interaction_date, interaction_id, interaction_type, interaction_value, override_value, party_name, payer_allocation_name, regions, sectors, sell_side_contacts, status, updated_by, updated_date, user_comment, user_rating, period_id, region, uuid) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) 
  Hibernate: update tInteraction set audit_upd_user_tx=?, audit_update_ts=?, average_value=?, company_names=?, consumer=?, contract_id=?, description=?, desk=?, duration=?, ext_party_id=?, include_in_vote=?, interaction_date=?, interaction_id=?, interaction_type=?, interaction_value=?, override_value=?, party_name=?, payer_allocation_name=?, regions=?, sectors=?, sell_side_contacts=?, status=?, updated_by=?, updated_date=?, user_comment=?, user_rating=? where uuid=?
  </code></pre>
  
  <p>Using Spring Boot jpa 1.5.12 and Hibernate 5.2.16.Final.</p>
  
  <p>Sorry for long post, but I am about to give up on using @LastModifiedDate. Thanks!</p>