Hi

I am working on Gwt with Hibernate at backend and am having this exception.
Can anyone help me in this that why I am geting this exception??

Caused by: org.hibernate.StaleObjectStateException: Row was updated or
deleted by another transaction (or unsaved-value mapping was incorrect):
[com.axim.emr.client.beans.Insurance#259]
    at
org.hibernate.event.def.DefaultMergeEventListener.entityIsDetached(DefaultMergeEventListener.java:418)
    at
org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:234)
    at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:715)
    at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:697)
    at
org.hibernate.engine.CascadingAction$6.cascade(CascadingAction.java:268)
    at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:292)
    at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:240)
    at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:193)
    at
org.hibernate.engine.Cascade.cascadeCollectionElements(Cascade.java:320)
    at org.hibernate.engine.Cascade.cascadeCollection(Cascade.java:266)
    at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:243)
    at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:193)
    at org.hibernate.engine.Cascade.cascade(Cascade.java:154)
    at
org.hibernate.event.def.DefaultMergeEventListener.cascadeOnMerge(DefaultMergeEventListener.java:563)
    at
org.hibernate.event.def.DefaultMergeEventListener.entityIsDetached(DefaultMergeEventListener.java:423)
    at
org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:234)
    at
org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:84)
    at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:705)
    at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:689)
    at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:693)
    at
com.axim.emr.server.DataServiceImpl.updatePatientObject(DataServiceImpl.java:227)
    at
com.axim.emr.server.DataServiceImpl.updatePatientObject(DataServiceImpl.java:1)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at
net.sf.gilead.gwt.PersistentRemoteService.processCall(PersistentRemoteService.java:174)


Thanks ,
Shakun

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