<AWT Dev> 回复： An issue of OpenJRE
Alexey Ivanov
alexey.ivanov at oracle.com
Mon May 30 10:12:42 UTC 2016
Hi Rong,
OpenJDK comes without font files in its jre/lib. Does OpenJDK not work
as expected?
By placing font files into jre/lib/fonts you change the behavior of the
JRE, and you get unexpected results. Just don't copy font files into JRE
directory. If you want to use additional fonts, install those font
according to your OS instructions.
Oracle JDK has several font files in its jre/lib/fonts. Those fonts are
part of the JRE. If you remove them, you can get unexpected results.
You say that the following code throws NullPointerException on the third
line:
BufferedImage image = new BufferedImage(200, 200,
BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = image.createGraphics();
FontMetrics fm = g2.getFontMetrics();
What is the current font selected into g2?
Have you tried explicitly setting a font?
g2.setFont(new Font(Font.DIALOG, Font.PLAIN, 12));
The stacktrace of NullPointerException could also help to diagnose the
problem. If you think it's a problem, you can submit a bug at
http://bugreport.java.com/
In the bug report, describe your environment (OS etc), your version of
Java, provide any error messages you get and a test case to reproduce
the problem.
Regards,
Alexey
On 21.05.2016 7:23, 31731705 wrote:
> 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 at 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 at localhost rong]# cat /etc/redhat-release
> CentOS release 6.6 (Final)
> [root at 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 at 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 at 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 at 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 at 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 at va91 UI]# ls javaJRE
> ASSEMBLY_EXCEPTION bin lib LICENSE man release THIRD_PARTY_README
> [root at 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 at 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.limasoftware at gmail.com>;
> *发送时间:* 2016年5月20日(星期五) 晚上10:24
> *收件人:* ""<31731705 at qq.com>;
> *抄送:* "dalibor topic"<dalibor.topic at oracle.com>;
> "awt-dev"<awt-dev at 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 <31731705 at qq.com
> <mailto:31731705 at 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.topic at oracle.com>;
> *Date: * Fri, May 20, 2016 08:33 PM
> *To: * "awt-dev"<awt-dev at 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
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