hg: jdk9/client/jdk: 6206439: JInternalFrame.setLayer(Integer layer) should throw NullPointerException when layer=null

[sergey.bylokhov at oracle.com]

Changeset: 2b0a7aacc8f5
Author:    serb
Date:      2015-07-30 19:10 +0300
URL:       http://hg.openjdk.java.net/jdk9/client/jdk/rev/2b0a7aacc8f5

6206439: JInternalFrame.setLayer(Integer layer) should throw NullPointerException when layer=null
Reviewed-by: ant, alexsch

! src/java.desktop/share/classes/javax/swing/JInternalFrame.java
+ test/javax/swing/JInternalFrame/SetLayerNPE/SetLayerNPE.java