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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)