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    • org.hsqldb.HsqlException: file input/output errorerror java.lang.NullPointerException closing file - file at org.hsqldb.error.Error.error(Unknown Source) at org.hsqldb.persist.DataFileCache.close(Unknown Source) at org.hsqldb.persist.DataFileDefrag.process(Unknown Source) at org.hsqldb.persist.DataFileCache.defrag(Unknown Source) at org.hsqldb.persist.Log.defrag(Unknown Source) at org.hsqldb.persist.Log.checkpoint(Unknown Source) at org.hsqldb.persist.Logger.checkpointInternal(Unknown Source) at org.hsqldb.persist.Logger.checkpoint(Unknown Source) at org.hsqldb.StatementCommand.getResult(Unknown Source) at org.hsqldb.StatementCommand.execute(Unknown Source) at org.hsqldb.Session.executeCompiledStatement(Unknown Source) at org.hsqldb.Session.execute(Unknown Source) at org.hsqldb.jdbc.JDBCPreparedStatement.fetchResult(Unknown Source) at org.hsqldb.jdbc.JDBCPreparedStatement.execute(Unknown Source) at test.HSQLDBTest.main( Caused by: java.lang.NullPointerException at<init>(Unknown Source) at org.hsqldb.lib.FileUtil.isStreamElement(Unknown Source) at org.hsqldb.lib.FileUtil.removeElement(Unknown Source) at org.hsqldb.persist.DataFileCache.deleteFile(Unknown Source) at org.hsqldb.persist.DataFileCache.deleteBackup(Unknown Source) ... 14 more

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