<hibernate-mapping package="com.something.domain.task"
   default-access="field">
   <class name="ReportTask" table="TASK" dynamic-insert="true">
      <cache usage="read-write" />
      <id name="id" column="ID" />
      <property name="updateDate" column="UPDATEDDATE" type="timestamp" />
      <many-to-one name="updatedBy" class="com.something.domain.user.User" column="UPDATEDBY"
         cascade="save-update"/>
   </class>      
</hibernate-mapping>

org.springframework.orm.hibernate3.HibernateOptimisticLockingFailureException: Object of class [com.something.domain.user.User] with identifier [asc344334433443]: optimistic locking failed; nested exception is org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.something.domain.user.User#asc344334433443]
Caused by: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.something.domain.user.User#asc344334433443]
   at org.hibernate.persister.entity.AbstractEntityPersister.check(AbstractEntityPersister.java:1635)
   at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2208)
   at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:2118)
   at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2374)
   at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:91)
   at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
   at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:232)
   at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:140)
   at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:297)
   at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
   at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:985)
   at org.springframework.orm.hibernate3.HibernateTemplate$27.doInHibernate(HibernateTemplate.java:801)
   at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:362)
   at org.springframework.orm.hibernate3.HibernateTemplate.flush(HibernateTemplate.java:799)
   at org.springframework.orm.hibernate3.HibernateTemplate$$FastClassByCGLIB$$cf0d264a.invoke(<generated>)
   at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
   at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:714)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:162)
   at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:53)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
   at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:652)
   at com.something.common.hibernate.HibernateTemplateWithExceptionConversion$$EnhancerByCGLIB$$82993685.flush(<generated>)
   at com.something.common.hibernate.AbstractHibernateDao.flush(AbstractHibernateDao.java:183)
   at com.something.domain.task.taskRepositoryTest.testSaveTask(taskRepositoryTest.java:51)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at junit.framework.TestCase.runTest(TestCase.java:154)
   at junit.framework.TestCase.runBare(TestCase.java:127)
   at org.springframework.test.ConditionalTestCase.runBare(ConditionalTestCase.java:69)
   at junit.framework.TestResult$1.protect(TestResult.java:106)
   at junit.framework.TestResult.runProtected(TestResult.java:124)
   at junit.framework.TestResult.run(TestResult.java:109)
   at junit.framework.TestCase.run(TestCase.java:118)
   at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
   at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)