JavaFX has various flags to either add debug logs or switch configuration.
However, there is no central location which lists all these flags.
There have been multiple attempts to officially do this but most of them failed:
This is my humble attempt to categorise and list all the flags:
General
| Flag |
Default |
Options |
Details |
| glass.platform |
platform specific |
macosx, windows, linux, gtk, ios, Monocle, swt |
Sets the platform for JavaFX application |
| jdk.gtk.verbose |
false |
Boolean |
Verbose logging related to GTK on Linux |
| jdk.gtk.version |
3 (since JFX 11) |
2, 3 |
Toggle between GTK versions. Default is 3 since OpenJFX 11 |
| javafx.verbose |
false |
boolean |
Verbose logging for JavaFX |
| monocle.platform |
MX6,OMAP,Dispman,Android,X11,Linux,Headless |
MX6,OMAP,Dispman,Android,X11,Linux,Headless |
Series of cascading fallbacks for what NativePlatform types |
Accessibility
| Flag |
Default |
Options |
Details |
| glass.accessible.force |
false |
boolean |
Force enable a11y on older platforms |
Animation
| Flag |
Default |
Options |
Details |
| javafx.animation.pulse |
60 |
number in hz |
override the default pulse rate |
| javafx.animation.framerate |
60 |
number in hz |
override the default frame rate |
| javafx.animation.fullspeed |
false |
boolean |
|
| com.sun.scenario.animation.adaptivepulse |
false |
boolean |
|
| com.sun.scenario.animation.fixed.pulse.length |
false |
boolean |
increment each animation by a fixed length of time for each pulse instead of using system time |
| com.sun.scenario.animation.AnimationMBean.enabled |
false |
boolean |
|
Quantum
| Flag |
Default |
Options |
Details |
| quantum.debug |
false |
boolean |
Force enable a11y on older platforms |
| quantum.multithreaded |
true |
boolean |
Disables multi-threaded toolkit |
| quantum.norenderjobs |
false |
boolean |
Quantum will stop submitting render jobs |
| quantum.singlethreaded |
false |
boolean |
Enable single GUI Threading. Can cause a drop in FPS |
| quantum.verbose |
false |
boolean |
Verbose logging in Quantum toolkit |
Prism
| Flag |
Default |
Options |
Details |
| prism.allowhidpi |
true |
boolean |
Disables hi-dpi scaling |
| prism.cacheshapes |
complex |
complex, all |
Shape caching optimizations |
| prism.debug |
false |
boolean |
Debug output in prism |
| prism.debugfonts |
false |
boolean |
Debug output related to fonts |
| prism.dirtyopts |
true |
boolean |
Disables dirty region optimizations |
| prism.dirtyregioncount |
6 |
number between 0 and 15 |
Sets the number of dirty regions to use |
| prism.disableBadDriverWarning |
false |
boolean |
Disable bad driver check warning |
| prism.forceGPU |
false |
boolean |
Force prism to run in HW accelerated mode |
| prism.forcepaint |
false |
boolean |
Force scene repaint on every frame |
| prism.newiio |
true |
boolean |
Disable use of new javafx-iio image loader |
| prism.noFallback |
false |
boolean |
disable fallback to another toolkit if prism couldn’t be initialized |
| prism.order |
platform specific |
j2d, d3d, es2, sw |
Graphics engines |
| prism.primtextures |
0 |
true, false, |
Sets texture mask size |
| prism.printallocs |
false |
boolean |
Print texture allocation data |
| prism.printrendergraph |
false |
boolean |
Prints out the render graph, annotated with dirty opts information |
| prism.printStats |
0 |
true or number (<=0 means do not print) |
Prism statistics print frequency |
| prism.rasterizerorder |
marlin |
nativepisces, javapisces, marlin, doublemarlin |
Select an alternative to default rasterizer |
| prism.scrollcacheopt |
false |
boolean |
Scrolling cache optimization |
| prism.showdirty |
false |
boolean |
Draws overlay rectangles showing where the dirty regions were |
| prism.showoverdraw |
false |
boolean |
Draws overlay rectangles showing not only the dirty regions, but the count each area within that dirty region was drawn (covered by bounds of a drawn object) |
| prism.trace |
false |
boolean |
Trace output in prism |
| prism.verbose |
false |
boolean |
Verbose output in prism |
Scaling
| Flag |
Default |
Options |
Details |
| glass.gtk.uiScale |
|
decimal e.g. “1.25” |
Force UI scaling factor |
| glass.win.forceIntegerRenderScale |
true |
boolean |
Disables force integer rendering scale |
| glass.win.minHiDPI |
|
percentage e.g. “125%” |
|
| glass.win.renderScale |
|
percentage e.g. “125%” |
|
| glass.win.uiScale |
|
percentage e.g. “125%” |
|
| sun.java2d.uiScale |
|
percentage e.g. “125%” |
|
| sun.java2d.uiScale.enabled |
|
true |
|
| swt.autoScale |
|
number e.g. “125” |
|