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I am using WinXP. I use java to generate a list of files. The file will be created as abc.txt.temp at first, and after completing the generation, it will be renamed to abc.txt. However, when i generating the files, some of the files failed to be renamed. It happen randomly. Is there anyway to find out the reason why it failed? int maxRetries = 60; logger.debug("retry"); while (maxRetries-- > 0) { if (isSuccess = file.renameTo(file2)) { break; } try { logger.debug("retry " + maxRetries); Thread.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //file.renameTo(file2); Thread.currentThread().getThreadGroup().getParent().list(); And the result: [DEBUG][2009-08-25 08:57:52,386] - retry 1 [DEBUG][2009-08-25 08:57:53,386] - retry 0 java.lang.ThreadGroup[name=system,maxpri=10] Thread[Reference Handler,10,system] Thread[Finalizer,8,system] Thread[Signal Dispatcher,9,system] Thread[Attach Listener,5,system] java.lang.ThreadGroup[name=main,maxpri=10] Thread[main,5,main] Thread[log4j mail appender,5,main] [DEBUG][2009-08-25 08:57:54,386] - isSuccess:false I would like to know a systematic approach to figure out the reason. Thanks.

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