java 无法在 JRE 8 中加载字体
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Cannot load font in JRE 8
提问by Khanetor
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.
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。
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
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(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$$anonfun$main.apply(App.scala:76)
at scala.App$$anonfun$main.apply(App.scala:76)
at scala.collection.immutable.List.foreach(List.scala:381)
at scala.collection.generic.TraversableForwarder$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.
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。
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.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.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(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$$anonfun$main.apply(App.scala:76)
at scala.App$$anonfun$main.apply(App.scala:76)
at scala.collection.immutable.List.foreach(List.scala:381)
at scala.collection.generic.TraversableForwarder$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.
因此，这不是 inputstream 的问题，而是 JRE 8 中字体本身的加载问题。
This seems like a bug in JRE 8 Font.
这似乎是 JRE 8 字体中的一个错误。
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).
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。
采纳答案by Khanetor
It turns out that this is a problem with the openjdk-8-jre-headlessinstallation. 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.
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（没有无头），问题就消失了。
If you look at the error log, the loading of the font require awt X11, which is missing from headlessversion of JRE.
如果您查看错误日志，字体的加载需要 awt X11，这是headlessJRE 版本中缺少的。
回答by leoleozhu
I get the same error with openjdk:8-jre-alpine. Switching to openjdk:8-jre helps.
我在使用 openjdk:8-jre-alpine 时遇到同样的错误。切换到 openjdk:8-jre 会有所帮助。
--- FROM openjdk:8-jre-alpine
+++ FROM openjdk:8-jre
回答by LazerBass
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-dejavupackage.
我们在使用 tomcat:8.0.38-jre8-alpine 时也遇到了这个错误。该图像缺少 fontconfig。您还可以安装ttf-dejavu软件包，而不是切换到不同的图像。
apk add --update ttf-dejavu
回答by Vertigo
On CentOS headless JRE is missing the fontconfigdependency:
在 CentOS 无头 JRE 上缺少fontconfig依赖项：
yum install fontconfig
Also one might need to install at least one font (dejavu, liberation, etc).
另外一个可能需要至少安装一个字体（dejavu，liberation，等）。
回答by Bhagwati Malav
For alpine and openjdk :
Use RUN apk --update add fontconfig ttf-dejavuWorked for me.
对于 alpine 和 openjdk：使用RUN apk --update add fontconfig ttf-dejavu对我来说有效。
回答by Rax
For me this resolved issue:
对我来说，这个已解决的问题：
apt-get install -y libfontconfig1
