java.lang.ClassCastException: java.util.HashSet cannot be cast to java.util.List

java.lang.ClassCastException: java.util.HashSet cannot be cast to java.util.List
at org.hibernate.type.ListType.wrap(ListType.java:62)
at org.hibernate.event.def.WrapVisitor.processArrayOrNewCollection(WrapVisitor.java:106)
at org.hibernate.event.def.WrapVisitor.processCollection(WrapVisitor.java:73)
at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:122)
at org.hibernate.event.def.WrapVisitor.processValue(WrapVisitor.java:120)
at org.hibernate.event.def.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:77)
at org.hibernate.event.def.AbstractSaveEventListener.visitCollectionsBeforeSave(AbstractSaveEventListener.java:390)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:295)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:713)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:701)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:697)
at dao.CategoryDAO.createCategory(CategoryDAO.java:32)
at main.TestAd.populateData(TestAd.java:71)
at main.TestAd.main(TestAd.java:35)

Issue:

The class types of Java object and mapping is not same. I used java.util.Set to associate in java class, where I declared associations using <list> in the mapping xml.

Solution:

Make the types same in java and mappings

org.hibernate.MappingException: persistent class not known

Caused by: org.hibernate.MappingException: persistent class not known: model.address
at org.hibernate.cfg.Configuration$1.getIdentifierType(Configuration.java:2934)
at org.hibernate.type.EntityType.getIdentifierType(EntityType.java:560)
at org.hibernate.type.EntityType.getIdentifierOrUniqueKeyType(EntityType.java:585)
at org.hibernate.persister.entity.AbstractPropertyMapping.initIdentifierPropertyPaths(AbstractPropertyMapping.java:236)
at org.hibernate.persister.entity.AbstractPropertyMapping.initPropertyPaths(AbstractPropertyMapping.java:224)
at org.hibernate.persister.entity.AbstractEntityPersister.initOrdinaryPropertyPaths(AbstractEntityPersister.java:1863)
at org.hibernate.persister.entity.AbstractEntityPersister.initPropertyPaths(AbstractEntityPersister.java:1902)
at org.hibernate.persister.entity.AbstractEntityPersister.postConstruct(AbstractEntityPersister.java:3128)
at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:439)
at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:84)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:286)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1872)
at util.SessionUtil.<clinit>(SessionUtil.java:10)
... 1 more

Issue:

There is a typo in the mapping xml. Instead of model.Address I typed model.address.

Solution:

Enter correct FQDN of class name.

org.hibernate.HibernateException: Javassist Enhancement failed

Exception in thread "main" org.hibernate.HibernateException: Javassist Enhancement failed: model.User
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxy(JavassistLazyInitializer.java:142)
at org.hibernate.proxy.pojo.javassist.JavassistProxyFactory.getProxy(JavassistProxyFactory.java:71)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.createProxy(AbstractEntityTuplizer.java:631)
at org.hibernate.persister.entity.AbstractEntityPersister.createProxy(AbstractEntityPersister.java:3736)
at org.hibernate.event.def.DefaultLoadEventListener.createProxyIfNecessary(DefaultLoadEventListener.java:360)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:281)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:152)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:1090)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:1038)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:630)
at org.hibernate.type.EntityType.resolve(EntityType.java:438)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:139)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:982)
at org.hibernate.loader.Loader.doQuery(Loader.java:857)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
at org.hibernate.loader.Loader.loadCollection(Loader.java:2166)
at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:62)
at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:627)
at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:83)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1863)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:369)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:111)
at org.hibernate.collection.PersistentSet.iterator(PersistentSet.java:186)
at main.TestAd.displayData(TestAd.java:49)
at main.TestAd.main(TestAd.java:35)
Caused by: java.lang.InstantiationException: model.User_$$_javassist_2
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxy(JavassistLazyInitializer.java:139)
... 24 more

Issue:

Hibernate is not able to instantiate the model User using java assist.


Solution:

Create a default no-arg constructor to the class User

java.sql.SQLSyntaxErrorException: user lacks privilege or object not found: USERID

Caused by: org.hibernate.exception.SQLGrammarException: could not insert: [model.Phone]
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:92)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:64)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2345)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2852)
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:320)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:713)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:701)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:697)
at dao.PhoneDAO.createPhone(PhoneDAO.java:34)
... 2 more
Caused by: java.sql.SQLSyntaxErrorException: user lacks privilege or object not found: USERID
at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
at org.hsqldb.jdbc.JDBCPreparedStatement.<init>(Unknown Source)
at org.hsqldb.jdbc.JDBCConnection.prepareStatement(Unknown Source)
at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:524)
at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:116)
at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.prepare(IdentityGenerator.java:90)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:54)

Reason :

The column does not match. I created schema using a mapping xml file. After creating schema I modified the column name of a property. This cause the exception java.sql.SQLSyntaxErrorException: user lacks privilege or object not found: USERID  and SQLGrammarException: could not insert: [model.Phone].

Solution:

1. Make sure the column names are same
2. If you change a mapping.hbm.xml update DB schema

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.

Upon technology eagerness and features available in popular ORM framework Hibernate, I started learning Hibernate in 2008. To share my experience with Hibernate to you and to have a  pleasant memory and footprint  I started this blog Today ( January 18 2012). Have a fun with Hibernate.