If you have received an error message while upgrading Confluence which said "HSQL Database needs to be cleaned. Please run HSQL17To18PreUpgradeCleaner.", and referred you to this page, you need to do the following:

  1. Confluence をシャットダウンします。
  2. Open a command window.
  3. Change your directory to the directory you set as your confluence.home directory.
  4. Execute the following command: java -jar <confluence install directory>/hsqlcleaner/hsqlcleaner.jar
  5. Start Confluence -- the upgrade will now work.

    Don't run this unless asked to by Confluence - it won't work

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