Migration from HSQLDB to Oracle fails

After successful Confluence setup on Oracle, import of backed-up HSQLDB data fails with an error:
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There was an error during import/export with plugin Confluence Space IA (Left Sidebar)(com.atlassian.confluence.plugins.confluence-space-ia) #5.1 (table AO_187CCC_SIDEBAR_LINK):There has been a SQL exception importing row #0 for table 'AO_187CCC_SIDEBAR_LINK' see the cause of this exception for more detail about it.

LOG file:

com.atlassian.confluence.importexport.ImportExportException: com.atlassian.activeobjects.spi.ActiveObjectsImportExportException: There was an error during import/export with plugin Confluence Space IA (Left Sidebar)(com.atlassian.confluence.plugins.confluence-space-ia) #5.1 (table AO_187CCC_SIDEBAR_LINK):There has been a SQL exception importing row #0 for table 'AO_187CCC_SIDEBAR_LINK' see the cause of this exception for more detail about it.
at com.atlassian.activeobjects.confluence.backup.ActiveObjectsBackupRestoreProvider.restore(ActiveObjectsBackupRestoreProvider.java:62)
at com.atlassian.confluence.importexport.xmlimport.FileBackupImporter.importPluginData(FileBackupImporter.java:367)
at com.atlassian.confluence.importexport.xmlimport.FileBackupImporter.importEverything(FileBackupImporter.java:138)
at com.atlassian.confluence.importexport.xmlimport.BackupImporter$1.doInTransactionWithoutResult(BackupImporter.java:156)
at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:33)
at com.atlassian.confluence.importexport.xmlimport.RestorePluginStateStoreTransactionCallbackDecorator.doInTransaction(RestorePluginStateStoreTransactionCallbackDecorator.java:47)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)
at com.atlassian.confluence.importexport.xmlimport.BackupImporter.doImportInternal(BackupImporter.java:149)
at com.atlassian.confluence.importexport.Importer.doImport(Importer.java:75)
at com.atlassian.confluence.importexport.DefaultImportExportManager.performImportInternal(DefaultImportExportManager.java:79)
at com.atlassian.confluence.importexport.DefaultImportExportManager.performImport(DefaultImportExportManager.java:69)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at com.sun.proxy.$Proxy118.performImport(Unknown Source)
at com.atlassian.confluence.importexport.actions.ImportLongRunningTask.runInternal(ImportLongRunningTask.java:86)
at com.atlassian.confluence.util.longrunning.ConfluenceAbstractLongRunningTask.run(ConfluenceAbstractLongRunningTask.java:26)
at com.atlassian.confluence.util.longrunning.ManagedTask.run(ManagedTask.java:35)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: com.atlassian.activeobjects.spi.ActiveObjectsImportExportException: There was an error during import/export with plugin Confluence Space IA (Left Sidebar)(com.atlassian.confluence.plugins.confluence-space-ia) #5.1 (table AO_187CCC_SIDEBAR_LINK):There has been a SQL exception importing row #0 for table 'AO_187CCC_SIDEBAR_LINK' see the cause of this exception for more detail about it.
at com.atlassian.activeobjects.backup.ImportExportErrorServiceImpl.newRowImportSqlException(ImportExportErrorServiceImpl.java:36)
at com.atlassian.dbexporter.importer.DataImporter.importTable(DataImporter.java:131)
at com.atlassian.dbexporter.importer.DataImporter.access$000(DataImporter.java:33)
at com.atlassian.dbexporter.importer.DataImporter$1.call(DataImporter.java:73)
at com.atlassian.dbexporter.importer.DataImporter$1.call(DataImporter.java:62)
at com.atlassian.dbexporter.jdbc.JdbcUtils.withConnection(JdbcUtils.java:31)
at com.atlassian.dbexporter.importer.DataImporter.doImportNode(DataImporter.java:61)
at com.atlassian.dbexporter.importer.AbstractImporter.importNode(AbstractImporter.java:49)
at com.atlassian.dbexporter.DbImporter.importData(DbImporter.java:73)
at com.atlassian.activeobjects.backup.ActiveObjectsBackup.restore(ActiveObjectsBackup.java:158)
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.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:58)
at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:62)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:56)
at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:39)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.osgi.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:59)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at com.sun.proxy.$Proxy359.restore(Unknown Source)
at com.atlassian.activeobjects.confluence.backup.ActiveObjectsBackupRestoreProvider.restore(ActiveObjectsBackupRestoreProvider.java:58)
... 30 more
Caused by: java.sql.SQLException: Invalid column type: 16
at oracle.jdbc.driver.OracleStatement.getInternalType(OracleStatement.java:3916)
at oracle.jdbc.driver.OraclePreparedStatement.setNullCritical(OraclePreparedStatement.java:4541)
at oracle.jdbc.driver.OraclePreparedStatement.setNull(OraclePreparedStatement.java:4523)
at oracle.jdbc.driver.OraclePreparedStatementWrapper.setNull(OraclePreparedStatementWrapper.java:1281)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.setNull(NewProxyPreparedStatement.java:157)
at com.atlassian.dbexporter.importer.DataImporter$BaseInserter.setBoolean(DataImporter.java:344)
at com.atlassian.dbexporter.importer.DataImporter$BaseInserter.setValue(DataImporter.java:413)
at com.atlassian.dbexporter.importer.DataImporter.importTable(DataImporter.java:123)
... 60 more