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java.lang.NullPointerException: 	at java.io.File.(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)	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(HSQLDBTest.java:24)