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I cannot load a font from an S3 Inputstream in JRE 8. I do not have issue if a system is installed with JRE 7, JDK 7, or even JDK 8.

val fontInputStream = s3Client.getObject(bucketName, objectKey).getObjectContent
val customFont = Font.createFont(Font.TRUETYPE_FONT, fontInputStream).deriveFont(Font.TRUETYPE_FONT, 20F)
The error that I got is
Exception in thread "main" java.io.IOException: Problem reading font data.
        at java.awt.Font.createFont0(Font.java:1000)
        at java.awt.Font.createFont(Font.java:877)
        at Main$.delayedEndpoint$Main$1(Main.scala:31)
        at Main$delayedInit$body.apply(Main.scala:11)
        at scala.Function0$class.apply$mcV$sp(Function0.scala:40)
        at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
        at scala.App$$anonfun$main$1.apply(App.scala:76)
        at scala.App$$anonfun$main$1.apply(App.scala:76)
        at scala.collection.immutable.List.foreach(List.scala:381)
        at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
        at scala.App$class.main(App.scala:76)
        at Main$.main(Main.scala:11)
        at Main.main(Main.scala)
I tried to load the inputstream to a temp file, but it does not help. I also tried to load a font directly from a local file, but I got a different error with getting font metadata. Here is the error log.
Exception in thread "main" java.lang.NullPointerException
        at sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1264)
        at sun.awt.FontConfiguration.readFontConfigFile(FontConfiguration.java:219)
        at sun.awt.FontConfiguration.init(FontConfiguration.java:107)
        at sun.awt.X11FontManager.createFontConfiguration(X11FontManager.java:776)
        at sun.font.SunFontManager$2.run(SunFontManager.java:431)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.font.SunFontManager.<init>(SunFontManager.java:376)
        at sun.awt.X11FontManager.<init>(X11FontManager.java:57)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
        at java.lang.Class.newInstance(Class.java:442)
        at sun.font.FontManagerFactory$1.run(FontManagerFactory.java:83)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.font.FontManagerFactory.getInstance(FontManagerFactory.java:74)
        at java.awt.Font.<init>(Font.java:614)
        at java.awt.Font.createFont(Font.java:1056)
        at Main$.delayedEndpoint$Main$1(Main.scala:32)
        at Main$delayedInit$body.apply(Main.scala:11)
        at scala.Function0$class.apply$mcV$sp(Function0.scala:40)
        at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
        at scala.App$$anonfun$main$1.apply(App.scala:76)
        at scala.App$$anonfun$main$1.apply(App.scala:76)
        at scala.collection.immutable.List.foreach(List.scala:381)
        at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
        at scala.App$class.main(App.scala:76)
        at Main$.main(Main.scala:11)
        at Main.main(Main.scala)
So, this is not a problem with inputstream, but rather with the loading of the font itself in JRE 8.
This seems like a bug in JRE 8 Font.
I am loading a font to use to draw a string in a picture.
My code is run in a Docker container using images java:7-jre (ok), java:7-jdk (ok), java:8-jre (fail), java:8-jdk (ok).
                and what's the URL for the font? You may want to run it through TTX, and see if that throws any errors, as well as try loading it in Font Forge, which is even more finicky when it comes to telling you the font you're loading has bad values somewhere.
– Mike 'Pomax' Kamermans
                Jun 4, 2015 at 5:33
I get the same error with openjdk:8-jre-alpine. Switching to openjdk:8-jre helps.
--- FROM openjdk:8-jre-alpine
+++ FROM openjdk:8-jre
We also got that error when using tomcat:8.0.38-jre8-alpine. That image is missing the fontconfig.
Instead of switching to a different image you could also install the ttf-dejavu package.
apk add --update ttf-dejavu
It turns out that this is a problem with the openjdk-8-jre-headless installation. This is the installation in the Docker image for java 8 JRE. I simply install openjdk-8-jre (without headless) and the problem goes away.
If you look at the error log, the loading of the font require awt X11, which is missing from headless version of JRE.
                To further clarify the answer, the headless flavor of JRE does not support font loading because a headless environment is one without UI, thus no need for font. The non headless version, however, supports UI, thus supports font.
– Khanetor
                Sep 25, 2016 at 23:49
I spent days suffering with it until I saw this github thread and made the night happy. it's practically calling GraphicsEnvironment again
link here
        
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