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// Source: https://wiki.eclipse.org/FAQ_How_do_I_write_a_message_to_the_workbench_status_line%3F

// From view
IActionBars bars = getViewSite().getActionBars().getStatusLineManager().setMessage("Hello");

// From editor
IEditorPart.getEditorSite().getActionBars().getStatusLineManager().setMessage("Hello");