It appears that JavaFX causes sandbox violations when run on Mac 10.8 using Oracle's Java 1.7.0_5. I've written a test application that simply instantiates a JFXPanel and it causes the following violation. Note, this is using the JFX that's embedded in the JRE.. so I'm not exactly sure what version it is, though I assume it's 2.1.1 because that is what's available to download from Oracle.

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JavaAppLauncher(1716) deny sysctl-write

Process: JavaAppLauncher [1716]
Path: /Users/jfinley/JDev/JavaFX/JFXSandboxTest/JFXSandboxTest/JFXSandboxTest.app/Contents/MacOS/JavaAppLauncher
Load Address: 0x101b86000
Identifier: com.test.JFXSandboxTest
Version: 1.0 (4.0)
Code Type: x86_64 (Native)
Parent Process: launchd [144]

Date/Time: 2012-08-03 08:52:47.933 -0600
OS Version: Mac OS X 10.8 (12A269)
Report Version: 8

Thread 0:
0 libsystem_kernel.dylib 0x00007fff907385f2 __sysctl + 10
1 libglass.dylib 0x000000016a2a3481 -[GlassApplication runLoop:] + 2049
2 Foundation 0x00007fff90de68a7 __NSThreadPerformPerform + 225
3 CoreFoundation 0x00007fff971b4841 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
4 CoreFoundation 0x00007fff971b4165 __CFRunLoopDoSources0 + 245
5 CoreFoundation 0x00007fff971d74e5 __CFRunLoopRun + 789
6 CoreFoundation 0x00007fff971d6dd2 CFRunLoopRunSpecific + 290
7 HIToolbox 0x00007fff8fd27774 RunCurrentEventLoopInMode + 209
8 HIToolbox 0x00007fff8fd27512 ReceiveNextEventCommon + 356
9 HIToolbox 0x00007fff8fd273a3 BlockUntilNextEventMatchingListInMode + 62
10 AppKit 0x00007fff9661cfa3 _DPSNextEvent + 685
11 AppKit 0x00007fff9661c862 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128
12 libosxapp.dylib 0x00000001625d282c -[NSApplicationAWT nextEventMatchingMask:untilDate:inMode:dequeue:] + 124
13 AppKit 0x00007fff96613c03 -[NSApplication run] + 517
14 libosxapp.dylib 0x00000001625d274b +[NSApplicationAWT runAWTLoopWithApp:] + 156
15 liblwawt.dylib 0x0000000162531748 -[AWTStarter starter:] + 1587
16 Foundation 0x00007fff90de68a7 __NSThreadPerformPerform + 225
17 CoreFoundation 0x00007fff971b4841 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
18 CoreFoundation 0x00007fff971b4165 __CFRunLoopDoSources0 + 245
19 CoreFoundation 0x00007fff971d74e5 __CFRunLoopRun + 789
20 CoreFoundation 0x00007fff971d6dd2 CFRunLoopRunSpecific + 290
21 libjli.dylib 0x0000000101cf391c CreateExecutionEnvironment + 871
22 libjli.dylib 0x0000000101cee10c JLI_Launch + 1952
23 JavaAppLauncher 0x0000000101b889cb launch + 5035
24 JavaAppLauncher 0x0000000101b874f6 main + 102
25 JavaAppLauncher 0x0000000101b87484 start + 52

Binary Images:
      0x101b86000 - 0x101b88ff7 com.test.JFXSandboxTest (4.0 - 1.0) <C94F476C-C7EC-3E7C-842D-177171B7D950> /Users/jfinley/JDev/JavaFX/JFXSandboxTest/JFXSandboxTest/JFXSandboxTest.app/Contents/MacOS/JavaAppLauncher
      0x101ced000 - 0x101cf6fff com.oracle.java.7u05.jdk (1.0 - 1.7.0_05) <8F4E1D7E-D38A-377D-83D0-C12334A097A4> /Users/jfinley/JDev/JavaFX/JFXSandboxTest/JFXSandboxTest/JFXSandboxTest.app/Contents/PlugIns/1.7.0.jre/Contents/MacOS/libjli.dylib
      0x162524000 - 0x162590fff liblwawt.dylib (1) <B491DADC-13EF-3046-86CB-FE4B61313DAB> /Users/jfinley/JDev/JavaFX/JFXSandboxTest/JFXSandboxTest/JFXSandboxTest.app/Contents/PlugIns/1.7.0.jre/Contents/Home/jre/lib/lwawt/liblwawt.dylib
      0x1625d1000 - 0x1625d6fff libosxapp.dylib (1) <6B723FF5-4D8A-341E-A28B-D49F6D76CFA2> /Users/jfinley/JDev/JavaFX/JFXSandboxTest/JFXSandboxTest/JFXSandboxTest.app/Contents/PlugIns/1.7.0.jre/Contents/Home/jre/lib/libosxapp.dylib
      0x16a2a0000 - 0x16a2d1fef libglass.dylib (0) <E2AA004E-7964-663E-863B-F5614D2E067A> /Users/jfinley/JDev/JavaFX/JFXSandboxTest/JFXSandboxTest/JFXSandboxTest.app/Contents/PlugIns/1.7.0.jre/Contents/Home/jre/lib/libglass.dylib
   0x7fff8fcc8000 - 0x7fff8fff7ff7 com.apple.HIToolbox (2.0) <49C4A53E-9239-3B9A-95DC-8C7B398E491D> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox
   0x7fff90726000 - 0x7fff90741ff7 libsystem_kernel.dylib (2050.7.9) <E0447BF5-E104-35B0-B28B-4156887D58F1> /usr/lib/system/libsystem_kernel.dylib
   0x7fff90d54000 - 0x7fff910b0ff7 com.apple.Foundation (6.8 - 945) <0C972F73-0C07-3384-98F2-B176E0289494> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
   0x7fff964c6000 - 0x7fff970f0fff com.apple.AppKit (6.8 - 1187) <C9309F5C-9441-3E5B-A120-B03FEDDA63F9> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
   0x7fff971a2000 - 0x7fff9738bfff com.apple.CoreFoundation (6.8 - 744) <47AEA7C7-EF9B-3FC6-AEBF-CE02FC650301> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation