Metal Look & Feel on a Mac

When I run my app on a Mac, the look and feel is not Metal.
How can I prevent this?

do this at the start of application.
[email protected]
try {
                         UIManager.setLookAndFeel("com.sun.java.swing.mac.MacLookAndFeel");
                         UIManager.setLookAndFeel(UIManager.getSystemLookAndFellClassName
                         } catch(Exception e) {
                         System.out.println("Error setting Motif LAF: " + e);
          }

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