<AWT Dev> 回复： An issue of OpenJRE

Sat May 21 04:23:25 UTC 2016

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> 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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