Release Note: References to java.awt.peer and java.awt.dnd.peer packages were removed from the public API

All methods that refer to types defined in the java.awt.peer and java.awt.dnd.peer packages (the "peer types") were removed from the Java API in Java SE 9 .
Application code which calls any such method which accepts or returns a type defined in these packages will no longer link. This is a BINARY incompatible change.

Additional information is provided here:
http://mail.openjdk.java.net/pipermail/awt-dev/2015-February/008924.html