FULL PRODUCT VERSION :
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+165)
Java HotSpot(TM) Server VM (build 9-ea+165, mixed mode, emulated-client)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
Under Windows LAF, JComboBox is too small. The height is smaller than for a native combobox and in the non-editable combobox in the test case, the selected item doesn't fit and is rendered with ellipses.

REGRESSION.  Last worked in version 8u131

ADDITIONAL REGRESSION INFORMATION: 
The JComboBox change in b161 (Changeset: 743970d86b39 Bug ID:6490753) seems to have introduced the problem.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
java ComboBoxLab


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.FlowLayout;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.UIManager;

public class ComboBoxLab extends JFrame
{
   public ComboBoxLab()
   {
      setDefaultCloseOperation( EXIT_ON_CLOSE );

      getContentPane().setLayout( new FlowLayout() );

      getContentPane().add( new JTextField( "item 1" ) );

      JComboBox< String > cboRo = new JComboBox< String >( new String[] { "item 1", "item 2", "item 3" } );
      getContentPane().add( cboRo );

      JComboBox< String > cboRw = new JComboBox< String >( new String[] { "item 1", "item 2", "item 3" } );
      cboRw.setEditable( true );
      getContentPane().add( cboRw );

      pack();
      setVisible( true );
   }

   public static void main( String[] args ) throws Exception
   {
      UIManager.setLookAndFeel( UIManager.getSystemLookAndFeelClassName() );
      new ComboBoxLab();
   }

}

---------- END SOURCE ----------