Re: 回复： An issue of OpenJRE

Mon, 30 May 2016 03:14:21 -0700 

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@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";<[email protected]>;
*发送时间:* 2016年5月20日(星期五) 晚上10:24
*收件人:* ""<[email protected]>;

*抄送:* "dalibor topic"<[email protected]>; 
"awt-dev"<[email protected]>;

*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 <[email protected] 
<mailto:[email protected]>> 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";<[email protected]>;
    *Date: * Fri, May 20, 2016 08:33 PM
    *To: * "awt-dev"<[email protected]>;
    *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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