hi all ..I was trying to insert multiple datas using a for loop in the one to many mapping..but i got an error:
My .hbm and .cfg files are:
LoanProposal.hbm
<hibernate-mapping>
<class name="LoanProposal" table="proposals">
<id name="proposalnumber" type="string" unsaved-value="null">
<generator class="assigned">
</generator>
</id>
<property name="bankid" type="integer"/>
<property name="letterreferencenumber" type="string"/>
<property name="dateofsubmission" type="date"/>
<property name="proposedloanamount" type="integer"/>
<property name="stagesofproposal" type="string"/>
<property name="dateofrejection" type="date"/>
<property name="reasonsforrejection" type="string"/>
<property name="loansanctionamount" type="integer"/>
<property name="sanctiondate" type="date"/>
<property name="remarks" type="string"/>
<property name="createdby" type="string"/>
<property name="createddate" type="date"/>
<property name="authorisedby" type="string"/>
<property name="authoriseddate" type="date"/>
<!-- ONE TO MANY MAPPING -->
<list name="bankloanproposal">
<key column="proposalnumber"/>
<list-index column="SEQUENCENUMBER" base="1"></list-index>
<one-to-many class="BankLoanProposal"/>
</list>

<!--MANY TO ONE MAPPING WITH BANKMASTER-->

<many-to-one class="BankMasterPojo" name="bankmasterpojo" column="BANKID" insert="false" update="true">

</many-to-one>
</class>
</hibernate-mapping>


.cfg file:

<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
<property name="hibernate.connection.driver_class">oracle.jdbc.OracleDriver</property>
<property name="hibernate.connection.url">jdbc:oracle:thin:@192.168.4.75:1521:ORCL</property>
<property name="hibernate.connection.username">co</property>
<property name="hibernate.connection.password">co</property>

<property name="hibernate.connection.pool_size">15</property>
<!--
<property name="hibernate.hbm2ddl.auto">create</property>
-->
<property name="hibernate.show_sql">true</property>
<mapping resource="BankLoanProposal.hbm.xml"/>
<mapping resource="LoanProposal.hbm.xml"/>
<mapping resource="BankMasterPojo.hbm.xml"/>


</session-factory>
</hibernate-configuration>





error:

org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session:
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:168)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:94)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:507)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:499)
at org.hibernate.engine.CascadingAction$5.cascade(CascadingAction.java:218)
at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:268)
at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:216)
at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:169)
at org.hibernate.engine.Cascade.cascadeCollectionElements(Cascade.java:296)
at org.hibernate.engine.Cascade.cascadeCollection(Cascade.java:242)
at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:219)
at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:169)
at org.hibernate.engine.Cascade.cascade(Cascade.java:130)
at org.hibernate.event.def.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:456)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:334)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
at com.onward.tufidco.dao.BankLoanProposalDAO.PROPOSAL_DATA(BankLoanProposalDAO.java:402)
at com.onward.tufidco.dao.BankLoanProposalDAO.SAVE_BANKLOANPROPOSAL(BankLoanProposalDAO.java:317)
at com.onward.tufidco.action.BankLoanProposalAction.SAVE_BANKLOANPROPOSAL(BankLoanProposalAction.java:359)
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 org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:269)
at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:170)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
at java.lang.Thread.run(Thread.java:619)



please help me out:

Can you log or print out the primary key in each loop? Check to see if each element has the same value. If it does, it could be a problem.

Maybe try opening and closing the transaction inside the loop.

thank for your concern ..I have solved the problem..Actually the problem was with primary key..By mistake i have set my primary key as assigned that why the problem.now its working fine...

Exactly! Each entity would have a null id, and the session would see each object as being the same. Glad you got it fixed!