This could be one of those confusing features of java: "true" does not necessarily mean that a file / directory has physically been created, i.e. on disk. If you created the file in an accessible directory (such as home), you shouldn't experience any issue with permissions. If it still doesn't work , you should look into the exact meaning of the mkdir etc. Making the files and directories (empty) oneself before setting to work is something that should help.
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