Schema text failed: Could not parse mapping document from file \samples\src\mapping\advert.hbm.xml

Schema text failed: Could not parse mapping document from file samples\src\mapping\advert.hbm.xml
at org.hibernate.tool.hbm2ddl.SchemaExportTask.execute(SchemaExportTask.java:172)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
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 org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:357)
at org.apache.tools.ant.Target.performTasks(Target.java:385)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1329)
at org.apache.tools.ant.Project.executeTarget(Project.java:1298)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.eclipse.ant.internal.ui.antsupport.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:32)
at org.apache.tools.ant.Project.executeTargets(Project.java:1181)
at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.run(InternalAntRunner.java:423)
at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.main(InternalAntRunner.java:137)
Caused by: org.hibernate.InvalidMappingException: Could not parse mapping document from file C:\mokader\CCA\workspace\samples\src\mapping\advert.hbm.xml
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXml(Configuration.java:4009)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXmlQueue(Configuration.java:3998)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3986)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1398)
at org.hibernate.cfg.Configuration.generateDropSchemaScript(Configuration.java:1002)
at org.hibernate.tool.hbm2ddl.SchemaExport.<init>(SchemaExport.java:130)
at org.hibernate.tool.hbm2ddl.SchemaExport.<init>(SchemaExport.java:92)
at org.hibernate.tool.hbm2ddl.SchemaExportTask.getSchemaExport(SchemaExportTask.java:241)
at org.hibernate.tool.hbm2ddl.SchemaExportTask.execute(SchemaExportTask.java:169)
... 16 more
Caused by: org.hibernate.DuplicateMappingException: Duplicate class/entity mapping model.Advert
at org.hibernate.cfg.Configuration$MappingsImpl.addClass(Configuration.java:3179)
at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:178)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXml(Configuration.java:4006)
... 24 more
--- Nested Exception ---
org.hibernate.InvalidMappingException: Could not parse mapping document from file C:\mokader\CCA\workspace\samples\src\mapping\advert.hbm.xml
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXml(Configuration.java:4009)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXmlQueue(Configuration.java:3998)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3986)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1398)
at org.hibernate.cfg.Configuration.generateDropSchemaScript(Configuration.java:1002)
at org.hibernate.tool.hbm2ddl.SchemaExport.<init>(SchemaExport.java:130)
at org.hibernate.tool.hbm2ddl.SchemaExport.<init>(SchemaExport.java:92)
at org.hibernate.tool.hbm2ddl.SchemaExportTask.getSchemaExport(SchemaExportTask.java:241)
at org.hibernate.tool.hbm2ddl.SchemaExportTask.execute(SchemaExportTask.java:169)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
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 org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:357)
at org.apache.tools.ant.Target.performTasks(Target.java:385)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1329)
at org.apache.tools.ant.Project.executeTarget(Project.java:1298)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.eclipse.ant.internal.ui.antsupport.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:32)
at org.apache.tools.ant.Project.executeTargets(Project.java:1181)
at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.run(InternalAntRunner.java:423)
at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.main(InternalAntRunner.java:137)
Caused by: org.hibernate.DuplicateMappingException: Duplicate class/entity mapping model.Advert
at org.hibernate.cfg.Configuration$MappingsImpl.addClass(Configuration.java:3179)
at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:178)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXml(Configuration.java:4006)
... 24 more

I am learning hibernate using Pro Hibernate 3 by DAVE MINTER AND JEFF LINWOOD. I followed the examples in the book. For the samples in the Chapter 3, while I execute the ant build to generate schema,  I got the above exception.

Problem:

I have specified the .hbm.xml in two places. one in hibernate.cfg.xml and other in ant build script. This cause the "Duplicate class/entity mapping model.Advert" exception.

Solution:

Remove the mapping elements from the hibernate.cfg.xml.