When a view is brought to the foreground, jEdit checks if any open buffers were modified on disk by another application. All affected buffers are listed in a dialog box. Buffers without unsaved changes are automatically reloaded. This feature can be disabled in the General pane of the Utilities>Global Options dialog box; see the section called “The Global Options Dialog Box”.
File>Reload can be used to reload the current buffer from disk at any other time; a confirmation dialog box will be displayed first if the buffer has unsaved changes.
File>Reload All discards unsaved changes in all open buffers and reload them from disk, asking for confirmation first.