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Object of class [Instance] with identifier [a5deddb9-d76c-433f-8b0d-e50cbf8f601e]: optimistic locking failed; nested exception is org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect) :
org.springframework.orm.ObjectOptimisticLockingFailureException: Object of class [Instance] with identifier [a5deddb9-d76c-433f-8b0d-e50cbf8f601e]: optimistic locking failed; nested exception is org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect) : 	at org.hibernate.persister.entity.AbstractEntityPersister.check(AbstractEntityPersister.java:2541)	at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3285)	at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:3183)	at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3525)	at org.hibernate.action.internal.EntityUpdateAction.execute(EntityUpdateAction.java:159)	at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:465)	at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:351)	at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:350)	at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:56)	at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1258)	at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:425)	at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)	at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:177)	at org.hibernate.jpa.internal.TransactionImpl.commit(TransactionImpl.java:77)	at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:517)	at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:761)	at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:730)	at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:485)	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:291)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)	at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)	at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:131)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)	at com.sun.proxy.$Proxy139.save(Unknown Source)