A DESCRIPTION OF THE PROBLEM :
This has been reported on AdoptOpenJDK community.
https://github.com/AdoptOpenJDK/openjdk-build/issues/443

But the latest Oracle/OpenJDK 11.0.1 have also this problem.

On Windows, the FontMetrics returned from Graphics.getFontMetrics(Font) within a PrinterJob are incorrect if the PageFormat has had the orientation explicitly set to PageFormat.LANDSCAPE or PageFormat.REVERSE_LANDSCAPE. The issue is not present when explicitly setting the orientation to PageFormat.PORTRAIT.

fontMetrics.getHeight()) always returns 0.

int i= 20;
Font font = new Font("Monospaced", 0, i);
FontMetrics fontMetrics = graphics.getFontMetrics(font);
System.out.println("font size=" + i + " FontMetrics.getHeight(): " + fontMetrics.getHeight());

REGRESSION : Last worked in version 8u191

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Use this program.

https://github.com/AdoptOpenJDK/openjdk-build/files/2287290/JPSFontMetrics.zip

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
fontMetrics.getHeight()) should return a correct value.
ACTUAL -
fontMetrics.getHeight()) should return 0 if PageFormat.LANDSCAPE or PageFormat.REVERSE_LANDSCAPE is set.

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See this program.

https://github.com/AdoptOpenJDK/openjdk-build/files/2287290/JPSFontMetrics.zip
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FREQUENCY : always