I'm new to hibernate and getting duplicate mapping exception while creating session? Exception occured after restarting application server. Can anyone help me to solve this problem?

%%%% Error Creating SessionFactory Default %%%%
org.hibernate.MappingException: Could not read mappings from resource: com/turkcell/apps/giftapp/model/entity/GftMainProcess.hbm.xml
at org.hibernate.cfg.Configuration.addResource(Configuration.java:484)
at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1443)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1411)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1392)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1368)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1288)
at com.turkcell.core.database.factory.HibernateSessionFactory.currentSession(HibernateSessionFactory.java:101)
at com.turkcell.core.database.dao.CoreHibernateDao.currentSession(CoreHibernateDao.java:35)
at com.turkcell.core.database.dao.CoreHibernateDao.commitAllTxns(CoreHibernateDao.java:80)
at com.turkcell.common.servletfilters.CoreHibernateFilter.doFilter(CoreHibernateFilter.java:53)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6458)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3661)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2630)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
Caused by: org.hibernate.DuplicateMappingException: Duplicate collection role mapping com.turkcell.apps.giftapp.model.entity.GftMainProcess.gftSubProcessMap
at org.hibernate.cfg.Mappings.addCollection(Mappings.java:123)
at org.hibernate.cfg.HbmBinder.createClassProperties(HbmBinder.java:1965)
at org.hibernate.cfg.HbmBinder.createClassProperties(HbmBinder.java:1940)
at org.hibernate.cfg.HbmBinder.bindRootPersistentClassCommonValues(HbmBinder.java:324)
at org.hibernate.cfg.HbmBinder.bindRootClass(HbmBinder.java:238)
at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:109)
at org.hibernate.cfg.Configuration.add(Configuration.java:385)
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:426)
at org.hibernate.cfg.Configuration.addResource(Configuration.java:481)
... 17 more

GftMainProcess.hbm.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE hibernate-mapping (View Source for full doctype...)>
- <!-- DO NOT EDIT: This is a generated file that is synchronized
-->
- <!-- by MyEclipse Hibernate tool integration.
-->
- <!-- Created Wed Nov 09 19:08:00 EET 2005
-->
- <hibernate-mapping package="com.turkcell.apps.giftapp.model.entity" default-cascade="none" default-access="property" default-lazy="true" auto-import="true">
- <class name="GftMainProcess" table="GFT_MAIN_PROCESS" schema="INTRAPPS" mutable="true" polymorphism="implicit" dynamic-update="false" dynamic-insert="false" select-before-update="false" optimistic-lock="version">
- <id name="processId" column="PROCESS_ID" type="java.lang.Long">
- <generator class="sequence">
<param name="schema">intrapps</param>
<param name="sequence">GFT_MAIN_PROCESS_ID_SEQ</param>
</generator>
</id>
<property name="processType" column="PROCESS_TYPE" type="java.lang.String" not-null="true" unique="false" optimistic-lock="true" lazy="false" generated="never" />
<property name="processDesc" column="PROCESS_DESC" type="java.lang.String" not-null="true" unique="false" optimistic-lock="true" lazy="false" generated="never" />
- <map name="gftSubProcessMap" inverse="true" cascade="all-delete-orphan" lazy="false" fetch="join" mutable="true" sort="unsorted" optimistic-lock="true" embed-xml="true">
<key column="PROCESS_ID" not-null="true" on-delete="noaction" />
<map-key formula="SUB_PROCESS_ID" type="long" />
<one-to-many class="GftSubProcess" not-found="exception" embed-xml="true" />
</map>
</class>
</hibernate-mapping>

You aren't by any chance adding the same mapping to the Hibernate configuration twice?

No, I have double-checked it.

I'm new to hibernate, and I'm suddenly having a similar issue...


Caused by: org.hibernate.DuplicateMappingException: Duplicate collection role mapping ebookdata.EbkBook.ebkRecords
at org.hibernate.cfg.Mappings.addCollection(Mappings.java:124)


My web app was working fine and suddenly it started throwing this exception. I noticed a couple of interesing things.

ONE:
This issue came up suddenly after I created some mappings and classes by reverse engineering and created a handful of classes. This new stuff is not mentioned in the exception. Interestingly, the referenced mapping is the FIRST mapping in my config file, thefirst one I created.

When I changed the order of the config file, it then references the new FIRST mapping. This makes me think that the mappings are somehow being read twice. I don't see how.

TWO:
When I restored my classes and mappings from before I had the issue, it did not go away. This restore did not include the workspace .metadata folder which I discovered was not being versioned.

Any thoughts?? This is driving me crazy. I'm trying to debug it but I'm just learning how at this point.