FULL PRODUCT VERSION :
Java(TM) SE Runtime Environment (build 1.8.0_40-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.40-b25, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Mac OS X 10.10.1

A DESCRIPTION OF THE PROBLEM :
Please see JDK-8077016.

For some reason this is only fixed in Java 9 but not backported to 8. This is a very bad regression bug for Java 8 and basically makes Java 8 unusable for any Swing application that accepts drops via the sanctioned drag and drop methods.

Please consider backporting this fix to Java 8. Using Java 7 is not a viable option for many and waiting on Java 9 is not viable either.

REGRESSION. Last worked in version 8u45

ADDITIONAL REGRESSION INFORMATION:
Last worked in 8 u31


REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
none, other than to use Java 7.