Drag and drop across JColorChoosers works within the same application, but no longer works when dragging between two instances of an application.
See attached test case.
Run the test case. Pick a colour on a colour picker, then drag the swatch rectangle from left to right, or vice versa. The drag and drop action copies the colour across to each side as expected.
Now run a second instance of the same test case. Drag a swatch from one window to the other. In previous builds this would also reproduce the colour across instances of the test case, but this functionality is broken in 8u40.
Bug does not exist in build 1.8.0-b132 or jdk 7 (build 1.7.0_25-b17), but can be reproduced with later jdk 1.8.0_40-ea builds.