Compare the runs of the manual test java/awt/xembed/server/TestXEmbedServerJava.java with most recent JDK build to date, b111, with Jigsaw M3 integrated, and some older build such as b107.
Note that for b111 you would need a new version of the test. Best would be to take a version posted for a review today in http://cr.openjdk.java.net/~yan/8150535/webrev.02
It would not compile with b107.

With b107, layout of the embedded window will be ugly but with b111 it will not be displayed at all.

For testing I used Ubuntu 14.04 x64 and OEL 7.1 x64