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java.sql.SQLException: Invalid column type at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:269) at oracle.jdbc.driver.OracleStatement.get_internal_type(OracleStatement.java:6164) at oracle.jdbc.driver.OraclePreparedStatement.setNull(OraclePreparedStatement.java:1316) at com.solarmetric.jdbc.DelegatingPreparedStatement.setNull(DelegatingPreparedStatement.java:369) at com.solarmetric.jdbc.PoolConnection$PoolPreparedStatement.setNull(PoolConnection.java:406) at com.solarmetric.jdbc.DelegatingPreparedStatement.setNull(DelegatingPreparedStatement.java:369) at com.solarmetric.jdbc.DelegatingPreparedStatement.setNull(DelegatingPreparedStatement.java:369) at com.solarmetric.jdbc.DelegatingPreparedStatement.setNull(DelegatingPreparedStatement.java:369) at com.solarmetric.jdbc.LoggingConnectionDecorator$LoggingConnection$LoggingPreparedStatement.setNull(LoggingConnectionDecorator.java:792) at com.solarmetric.jdbc.DelegatingPreparedStatement.setNull(DelegatingPreparedStatement.java:369) at kodo.jdbc.sql.DBDictionary.setNull(DBDictionary.java:950) at kodo.jdbc.sql.OracleDictionary.setNull(OracleDictionary.java:450) at kodo.jdbc.sql.RowImpl.toSQL(RowImpl.java:828) at kodo.jdbc.sql.RowImpl.flush(RowImpl.java:1039) at kodo.jdbc.sql.RowImpl.flush(RowImpl.java:975) at kodo.jdbc.runtime.PreparedStatementManager.flushInternal(PreparedStatementManager.java:160) at kodo.jdbc.runtime.PreparedStatementManager.flush(PreparedStatementManager.java:84) at kodo.jdbc.runtime.UpdateManagerImpl.flush(UpdateManagerImpl.java:445) at kodo.jdbc.runtime.UpdateManagerImpl.flush(UpdateManagerImpl.java:193) at kodo.jdbc.runtime.UpdateManagerImpl.flush(UpdateManagerImpl.java:95) at kodo.jdbc.runtime.JDBCStoreManager.flush(JDBCStoreManager.java:609) at kodo.runtime.DelegatingStoreManager.flush(DelegatingStoreManager.java:153) at kodo.runtime.PersistenceManagerImpl.flush(PersistenceManagerImpl.java:1122) at kodo.runtime.PersistenceManagerImpl.flushSafe(PersistenceManagerImpl.java:1005) at kodo.runtime.PersistenceManagerImpl.beforeCompletion(PersistenceManagerImpl.java:932) at kodo.runtime.LocalManagedRuntime.commit(LocalManagedRuntime.java:69) at kodo.runtime.PersistenceManagerImpl.commit(PersistenceManagerImpl.java:592) at com.ysoft.jdo.book.library.LibraryHandler.commitTransaction(LibraryHandler.java:175) at com.ysoft.jdo.book.library.client.CommitTransaction.execute(Library.java:279) at com.ysoft.jdo.book.common.console.UserInterface.execute(UserInterface.java:196) at com.ysoft.jdo.book.common.console.UserInterface.pumpCommands(UserInterface.java:186) at com.ysoft.jdo.book.library.client.Library.run(Library.java:139) at com.ysoft.jdo.book.library.client.Library.main(Library.java:104)