无法在 JRE 8 中加载字体 [英] Cannot load font in JRE 8

问题描述

我无法从 JRE 8 中的 S3 输入流加载字体.如果系统安装了 JRE 7、JDK 7 甚至 JDK 8，我没有问题.

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)

我得到的错误是

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)

我尝试将输入流加载到临时文件，但没有帮助.我还尝试直接从本地文件加载字体，但在获取字体元数据时遇到了不同的错误.这是错误日志.

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)

因此，这不是 inputstream 的问题，而是 JRE 8 中字体本身的加载问题.

So, this is not a problem with inputstream, but rather with the loading of the font itself in JRE 8.

这似乎是 JRE 8 字体中的一个错误.

This seems like a bug in JRE 8 Font.

我正在加载用于在图片中绘制字符串的字体.我的代码使用图像 java:7-jre (ok)、java:7-jdk (ok)、java:8-jre (fail)、java:8-jdk (ok) 在 Docker 容器中运行.

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).

推荐答案

原来这是openjdk-8-jre-headless 安装的问题.这是 Java 8 JRE 的 Docker 镜像中的安装.我只需安装 openjdk-8-jre(没有 headless)，问题就消失了.

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.

如果您查看错误日志，字体的加载需要 awt X11，这是 headless 版本的 JRE 所缺少的.

If you look at the error log, the loading of the font require awt X11, which is missing from headless version of JRE.

这篇关于无法在 JRE 8 中加载字体的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！