ADDITIONAL SYSTEM INFORMATION :
Linux
openjdk version "1.8.0_412"

A DESCRIPTION OF THE PROBLEM :
Getting a NPE with that stacktrace

java.lang.NullPointerException
at java.awt.image.ComponentColorModel.getDataElements(ComponentColorModel.java:1555)
at sun.awt.image.PixelConverter.rgbToPixel(PixelConverter.java:57)
at sun.java2d.loops.SurfaceType.pixelFor(SurfaceType.java:434)
at sun.java2d.SurfaceData.pixelFor(SurfaceData.java:973)
at sun.java2d.SunGraphics2D.validateColor(SunGraphics2D.java:1755)
at sun.java2d.SunGraphics2D.<init>(SunGraphics2D.java:290)
at sun.java2d.SunGraphicsEnvironment.createGraphics(SunGraphicsEnvironment.java:186)
at java.awt.image.BufferedImage.createGraphics(BufferedImage.java:1182)

The exactly same code works with the oracle JDK.
What changes:
in ComponentColorModel with the Oracle JDK we get in this condition, not with the openjdk version
if (ColorModel.isLinearGRAYspace(ics)) {