JDK: client's nightly for JDK9-b119, jtreg: latest nigtly. OS: Ubuntu 14.04 linux (but reproducible on other platforms as well)

Tests affected:

JGlassPaneInternalFrameOverlapping.java
JGlassPaneMoveOverlapping.java
JInternalFrameMoveOverlapping.java
JInternalFrameOverlapping.java
JScrollPaneOverlapping.java
JSplitPaneOverlapping.java
OpaqueOverlapping.java
OpaqueOverlappingChoice.java

Error logs look like:

/export/jdk9.ws/9.client/jdk/test/java/awt/Mixing/AWT_Mixing/OverlappingTestBase.java:26: warning: ComponentPeer is internal proprietary API and may be removed in a future release
import java.awt.peer.ComponentPeer;
                    ^
/export/jdk9.ws/9.client/jdk/test/java/awt/Mixing/AWT_Mixing/OverlappingTestBase.java:33: warning: AWTAccessor is internal proprietary API and may be removed in a future release
import sun.awt.AWTAccessor;
              ^
/export/jdk9.ws/9.client/jdk/test/java/awt/Mixing/AWT_Mixing/OverlappingTestBase.java:34: warning: EmbeddedFrame is internal proprietary API and may be removed in a future release
import sun.awt.EmbeddedFrame;
              ^
/export/jdk9.ws/9.client/jdk/test/java/awt/Mixing/AWT_Mixing/OverlappingTestBase.java:247: error: cannot find symbol
                    java.awt.Helper.addExports("sun.awt.X11", OverlappingTestBase.class.getModule());
                            ^
  symbol: class Helper
  location: package java.awt
/export/jdk9.ws/9.client/jdk/test/java/awt/Mixing/AWT_Mixing/OverlappingTestBase.java:251: error: cannot find symbol
                    java.awt.Helper.addExports("sun.awt.windows", OverlappingTestBase.class.getModule());
                            ^
  symbol: class Helper
  location: package java.awt
/export/jdk9.ws/9.client/jdk/test/java/awt/Mixing/AWT_Mixing/OverlappingTestBase.java:255: error: cannot find symbol
                    java.awt.Helper.addExports("sun.lwawt", OverlappingTestBase.class.getModule());
                            ^
  symbol: class Helper
  location: package java.awt
/export/jdk9.ws/9.client/jdk/test/java/awt/Mixing/AWT_Mixing/OverlappingTestBase.java:256: error: cannot find symbol
                    java.awt.Helper.addExports("sun.lwawt.macosx", OverlappingTestBase.class.getModule());
                            ^
  symbol: class Helper
  location: package java.awt
/export/jdk9.ws/9.client/jdk/test/java/awt/Mixing/AWT_Mixing/OverlappingTestBase.java:260: warning: ComponentPeer is internal proprietary API and may be removed in a future release
                ComponentPeer peer = AWTAccessor.getComponentAccessor()
                ^
/export/jdk9.ws/9.client/jdk/test/java/awt/Mixing/AWT_Mixing/OverlappingTestBase.java:260: warning: AWTAccessor is internal proprietary API and may be removed in a future release
                ComponentPeer peer = AWTAccessor.getComponentAccessor()
                                     ^
/export/jdk9.ws/9.client/jdk/test/java/awt/Mixing/AWT_Mixing/OverlappingTestBase.java:280: warning: EmbeddedFrame is internal proprietary API and may be removed in a future release
                EmbeddedFrame eframe = (EmbeddedFrame) eframeCtor.newInstance(frameWindow);
                ^
/export/jdk9.ws/9.client/jdk/test/java/awt/Mixing/AWT_Mixing/OverlappingTestBase.java:280: warning: EmbeddedFrame is internal proprietary API and may be removed in a future release
                EmbeddedFrame eframe = (EmbeddedFrame) eframeCtor.newInstance(frameWindow);
                                        ^
Note: /export/jdk9.ws/9.client/jdk/test/java/awt/Mixing/AWT_Mixing/OverlappingTestBase.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
4 errors
7 warnings
result: Failed. Compilation failed: Compilation failed