Hi Mario and Dalibor,
Thanks for you feedback. Let me give more information to reproduce it. 1. Get OpenJDK 1.8 code from http://download.java.net/openjdk/jdk8/ [root@localhost rong]# ls -l openjdk-8-src-b132-03_mar_2014.zip -rwxr--r-- 1 root root 124099402 5月 9 15:34 openjdk-8-src-b132-03_mar_2014.zip 2. Build OpenJDK 1.8, and my build OS is CentOS 6.6, [root@localhost rong]# cat /etc/redhat-release CentOS release 6.6 (Final) [root@localhost rong]# uname -a Linux localhost.localdomain 2.6.32-504.el6.i686 #1 SMP Wed Oct 15 03:02:07 UTC 2014 i686 i686 i386 GNU/Linux and we will get j2re-image and j2sdk-image folder [root@localhost rong]# ls openjdk/build/linux-x86-normal-server-release/images/j2* openjdk/build/linux-x86-normal-server-release/images/j2re-image: ASSEMBLY_EXCEPTION bin lib LICENSE man release THIRD_PARTY_README openjdk/build/linux-x86-normal-server-release/images/j2sdk-image: ASSEMBLY_EXCEPTION bin demo include jre lib LICENSE man release sample src.zip THIRD_PARTY_README Yes, you are right, now there is no fonts folder in jre/lib. [root@localhost openjdk]# build/linux-x86-normal-server-release/images/j2re-image/bin/java -version openjdk version "1.8.0-internal" OpenJDK Runtime Environment (build 1.8.0-internal-root_2016_05_09_10_59-b00) OpenJDK Server VM (build 25.0-b70, mixed mode) [root@localhost openjdk]# build/linux-x86-normal-server-release/images/j2sdk-image/bin/java -version openjdk version "1.8.0-internal" OpenJDK Runtime Environment (build 1.8.0-internal-root_2016_05_09_10_59-b00) OpenJDK Server VM (build 25.0-b70, mixed mode) 3. Packge j2re-image folder and copied to another Cent OS, this is simple Cent OS installation and without any font files. Suppose naming the jre folder "javaJRE" Another CentOS machine information: [root@va91 UI]# uname -a Linux va91.openjre 2.6.32-573.3.1.el6.x86_64 #1 SMP Thu Aug 13 22:55:16 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux JRE Infomation: [root@va91 UI]# ls javaJRE ASSEMBLY_EXCEPTION bin lib LICENSE man release THIRD_PARTY_README [root@va91 UI]# javaJRE/bin/java -version openjdk version "1.8.0-internal" OpenJDK Runtime Environment (build 1.8.0-internal-root_2016_05_09_10_59-b00) OpenJDK Server VM (build 25.0-b70, mixed mode) 4. Actually most Java codes runs well in this jre environment, but following codes (actually 3rd line) will cause NullPointer exception. BufferedImage image = new BufferedImage(200, 200, BufferedImage.TYPE_INT_RGB); Graphics2D g2 = image.createGraphics(); FontMetrics fm = g2.getFontMetrics(); Some articles said that's because OpenJRE depends on font files, so I copied some font files, and there are two ways: 1) copied font files into /usr/share/fonts folder, that's good and easy, and exception vanishes and app runs well. 2) By referring to oracle JRE, I copied font files into openjre/lib/fonts folder, and wrote fontconfig.properties. I'm not sure if OpenJRE will parse it but it's worty trying. [root@va91 javaJRE]# ls lib/font* lib/fontconfig.properties lib/fontconfig.properties.src lib/fontconfig.RedHat.6.properties.src lib/fonts: fonts.dir LucidaBrightDemiItalic.ttf LucidaBrightRegular.ttf LucidaSansRegular.ttf LucidaTypewriterRegular.ttf LucidaBrightDemiBold.ttf LucidaBrightItalic.ttf LucidaSansDemiBold.ttf LucidaTypewriterBold.ttf The expecption still disappeared, but FontMetrics fm has some odd values and cause subsequent codes wrong. After further study, I found even I removed all fontconfig* files this problem still existed. That means as long as jre/lib/fonts folder has font files FontMetrics will have wrong value. I don't understand why openjre has this behavior and hope to get answer here. Will OpenJRE read fontconfig.properties and read font from jre/lib/fonts? Thanks for you patience and time. Regards, Rong ------------------ 原始邮件 ------------------ 发件人: "Mario Torre";<neugens.limasoftw...@gmail.com>; 发送时间: 2016年5月20日(星期五) 晚上10:24 收件人: ""<31731...@qq.com>; 抄送: "dalibor topic"<dalibor.to...@oracle.com>; "awt-dev"<awt-dev@openjdk.java.net>; 主题: Re: <AWT Dev> An issue of OpenJRE It's very difficult to understand your issue, beside, it seems that you are manually copying around libraries and it's clear that this only has the effect of destabilizing the platform. I suggest to start with a clear description of what the problem is, what is the expected behavior, what is the environment and how to reproduce it, in a simple, possibly self contained way. Then you should file a bug report. Cheers, Mario On Friday, 20 May 2016, 31731705 <31731...@qq.com> wrote: Hi Dalibor, Actually this time I download OpenJDK source code and build it myself, but I still met this issue. I wonder why font files in jre/lib/fonts folder impact openjre. Here is a brief of this problem, I try to decribe it clearly. I build OpenJDK, and copy j2re-image to my folder such as /home/rong/jre, and use this jre to run my java applicaton. In further study I have found following codes, fm will have wrong value as long as jre/lib/fonts has font files (some ttf files). BufferedImage image = new BufferedImage(200, 200, BufferedImage.TYPE_INT_RGB); Graphics2D g2 = image.createGraphics(); FontMetrics fm = g2.getFontMetrics(); But if I moved these font files into /usr/share/fonts folder, the problems goes away. I'm not sure why these font files impact open jre run time. I don't think this problem is related to centos. BTW, I have installed freetype and fontconfig package. Regards, Rong ------------------ Original ------------------ From: "dalibor topic";<dalibor.to...@oracle.com>; Date: Fri, May 20, 2016 08:33 PM To: "awt-dev"<awt-dev@openjdk.java.net>; Subject: Re: <AWT Dev> An issue of OpenJRE On 20.05.2016 10:45, 31731705 wrote: > > Can someboday tell me the differences If you have encountered problems with binaries provided by CentOS, you'll need to contact CentOS for support. cheers, dalibor topic -- <http://www.oracle.com> Dalibor Topic | Principal Product Manager Phone: +494089091214 <tel:+494089091214> | Mobile: +491737185961 <tel:+491737185961> ORACLE Deutschland B.V. & Co. KG | Kühnehöfe 5 | 22761 Hamburg ORACLE Deutschland B.V. & Co. KG Hauptverwaltung: Riesstr. 25, D-80992 München Registergericht: Amtsgericht München, HRA 95603 Komplementärin: ORACLE Deutschland Verwaltung B.V. 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