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List of undocumented properties to change the behavior of Swing in Suns JVM.

These properties can be passed to any application using the -D flag on the java executable. These flags have not been defined by any JCP and have not been documented in any standards document by the Sun Swing team, so don't expect these flags to work on all versions or all platforms.

Flag	type	Default	As of Version	Platform	Description
swing.boldMetal	boolean	?	?	All	Documented in MetalLookAndFeel , whether metal should use bold fonts.
swing.defaultlaf	classname	?	?	All	If a developer doesn't explicitly specify a look and feel, this will be used.
swing.useSystemFontSettings	boolean	true	?	Windows	whether or not the system font sizes should be used. This can also be used for Swing's windows look and feel to turn off getting the fonts from the desktop.
sun.java2d.noddraw	boolean	?	?	Windows	turn off directX directdraw for faulty installations
swing.aatext	boolean	?	1.5/5.0	All	make all widgets use anti-aliasing
java.awt.headless	boolean	?	?	All	Allow the JVM to instantiate things like Color and other awt-objects without a display to show it on
sun.awt.noerasebackground	boolean	false	?	All	Do not erase the backgound during moving windows "gray fog"
sun.swing.enableImprovedDragGesture	boolean	false	update 5 of J2SE 5.0	All	http://weblogs.java.net/blog/shan_man/archive/2005/06/improved_drag_g.html
sun.awt.keepWorkingSetOnMinimize	boolean	false	1.5/5.0	Windows	Keep awt working set in memory
java.awt.fonts	String	?	?	All(?)	Set location of fonts?
java.awt.graphicsenv	classname	?	?	All(?)	Name of graphics environment class?
sun.awt.exception.handler	classname	?	?	All(?)	Class that handles uncaught exceptions (but not thread death)
awt.toolkit	classname	?	?	All(?)	Default Toolkit class ?
javax.swing.adjustPopupLocationToFit	boolean	?	?	All(?)	? See bug 4725596
swing.noxp	boolean	?	?	All(?)	On Windows XP platform, swing looks like Windows 2000 instead.
awt.image.incrementaldraw	String	?	?	All(?)	?
awt.image.redrawrate	String	?	?	All(?)	?
awt.nativeDoubleBuffering	String	?	?	All(?)	When turned off, blinking is a revalidate(), and a quick flicker is a repaint()
awt.threadgroup	String	?	?	All(?)	?
i18n	String	?	?	All(?)	?
java.awt.Window.locationByPlatform	String	?	?	All(?)	?
java.awt.im.style	String	?	?	All(?)	?
java.awt.syncLWRequests	String	?	?	All(?)	?
java2d.font.usePlatformFont	String	?	?	All(?)	?
javax.accessibility.assistive_technologies	String	?	?	All(?)	?
javax.accessibility.screen_magnifier_present	String	?	?	All(?)	?
javax.swing.adjustPopupLocationToFit	String	?	?	All(?)	?
sun.awt.erasebackgroundonresize	String	?	?	All(?)	?
sun.awt.fontconfig	String	?	?	All(?)	?
sun.awt.nopixfmt	String	?	?	All(?)	?
sun.java2d.accelReset	String	?	?	All(?)	?
sun.java2d.accthreshold	String	?	?	All(?)	?
sun.java2d.allowrastersteal	String	?	?	All(?)	?
sun.java2d.checkRegistry	String	?	?	All(?)	?
sun.java2d.d3d	String	?	?	All(?)	Direct 3D
sun.java2d.d3dtexbpp	String	?	?	All(?)	?
sun.java2d.ddblit	String	?	?	All(?)	?
sun.java2d.ddforcevram	String	?	?	All(?)	?
sun.java2d.ddlock	String	?	?	All(?)	?
sun.java2d.ddoffscreen	String	?	?	All(?)	?
sun.java2d.ddscale	String	?	?	All(?)	?
sun.java2d.debugfonts	String	?	?	All(?)	?
sun.java2d.disableRegistry	String	?	?	All(?)	?
sun.java2d.font.minstrikes	String	?	?	All(?)	?
sun.java2d.fontpath	String	?	?	All(?)	?
sun.java2d.gdiBlit	String	?	?	All(?)	?
sun.java2d.managedimages	String	?	?	All(?)	?
sun.java2d.noType1Font	String	?	?	All(?)	?
sun.java2d.offscreenSharing	String	?	?	All(?)	?
sun.java2d.opengl	String	?	?	All(?)	Turns on/off OpenGL ? acceleration/support ?
sun.java2d.reftype	String	?	?	All(?)	?
sun.java2d.trace	String	?	?	All(?)	?
sun.java2d.translaccel	String	?	?	All(?)	Turns on/off translucency Acceleration ?
suppressSwingDropSupport	String	?	?	All(?)	Turn off Drag n Drop in Swing (only AWT DnD )
swing.auxiliarylaf	String	?	?	All(?)	?
swing.crossplatformlaf	String	?	?	All(?)	?
swing.disablenavaids	String	?	?	All(?)	Navigation Helpers
swing.plaf.metal.controlFont	String	?	?	All(?)	?
swing.plaf.metal.smallFont	String	?	?	All(?)	?
swing.plaf.metal.systemFont	String	?	?	All(?)	?
swing.plaf.multiplexinglaf	String	?	?	All(?)	?
swing.useSystemFontSettings	String	?	?	All(?)	?
swing.volatileImageBufferEnabled	String	?	?	All(?)	?
swing.disableFileChooserSpeedFix	boolean	?	?	All(?)	Something related to using JFileChooser ?

The following properties are Swing component client properties, which are usually introduced to provide new features without changing the public API. To use them you call component.putClientProperty(propertyName, value), for example: myJTreeInstance.putClientProperty("JTree.lineStyle", "None").

The two JTree and JToolBar properties were reported here http://www.onjava.com/pub/a/onjava/2005/08/10/swinghacks.html?page=2 Apple has some client properties to make a Swing application integrate better, see http://developer.apple.com/technotes/tn2007/tn2196.html

Flag	type	Default	As of Version	Platform	Description
JComboBox .isTableCellEditor	boolean	false	?	All	If true, changing the selection in the drop down does not update the selected item in the ComboBox (if L&F extends BasicComboBoxUI )
JToolBar .isRollover	boolean	false	?	All(?)	Turn rollover on for a JToolBar
JTree.lineStyle	String	?	?	All(?)	Show lines in JTree, value should be "Angled"
JTree.lineStyle	String	?	?	All(?)	Hide lines in JTree, value should be "None"
terminateEditOnFocusLost	boolean	false	?	All(?)	Automatically stopCellEditing (or cancel if stop fails) when the JTable loses focus

The following properties are L&F properties; you should update them using UIManager.put("foo", bar); Only interresting properties are shown here; properties that should have been set to be enabled per default if Swing would have been marketed this year..

Flag	type	Description
Button.defaultButtonFollowsFocus	boolean	The JOptionpane will listen to focus change events and move the default button when the focus moves to one of the other buttons.
FileChooser .readOnly	boolean	All constructed FileChoosers will have editing of file names disabled.

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