Hacking the OpenJDK

Andrew John Hughes gnu_andrew at member.fsf.org
Mon Mar 24 07:39:17 PDT 2008 

On 24/03/2008, Camel Aissani <camel.aissani at gmail.com> wrote:
> Lillian,
>
> I get my icedtea sources from mercurial.
> The make under icedtea folder works perfectly.
>
> I don't know if it makes sense to only build the jdk (I only want to fix
> SWING issues)?

You at least need to build j2se and HotSpot to have something usable.
If you aren't modifying code elsewhere, it won't be rebuilt.

> In fact, it is very difficult to launch the make from folder openjdk/make.

You shouldn't be running this make, but IcedTea's make so that it
passes through the correct options to the OpenJDK build.

>  Previously, I had a problem with ant because my ANT_HOME wasn't set :(
> After having resolved this problem, I had many others problems with env
> variables.
> I know that I can set many of them with the icedtea make (make env),but it
> is not enough.
>  Freetype check version failed
> Plugs libraries wasn't found even if ALT_BINARY_PLUGS_PATH was setted
> ...
>

Replacement (Free) plug libraries for OpenJDK are part of IcedTea and
will be configured by its build system.  Perhaps include here the
output from IcedTea's make when it runs make in OpenJDK?

The Freetype check failure suggests you don't have a new enough
Freetype installed by your distro (with headers).

> Finally, I am going to use the SWING netbeans projects located in
> icedtea/openjdk/jdk/make/netbeans.
>  It will be nice if the documentation here
> http://nb-openjdk.netbeans.org/get-and-build.html can be
> updated with the right path to located netbeans projects.
>

This is a question for the Sun OpenJDK people.

> Camel
>
> 2008/3/24, Lillian Angel <langel at redhat.com>:
> > Camel Aissani wrote:
> > > Hi Lillian,
> > >
> > > Sorry to insist but I updated my repo and I still have the exception.
> > > In my repo, I have a patch file icedtea-version.patch and is correctly
> > > applied on these files :
> > > openjdk/jdk/make/common/shared/Defs.gmk
> > > openjdk/hotspot/src/share/vm/runtime/arguments.cpp
> >
> > When did you update the repo? This patch should definitely be there, but
> > it was modified. Run make distclean && hg pull && hg update.
> >
> >
> > >
> > > What can I do to identify and fix my problem?
> >
> >
> > How are yo configuring IcedTea?
> >
> >
> > Lillian
> >
> > >
> > > Thanks,
> > > Camel
> > >
> > > 2008/3/21, Lillian Angel <langel at redhat.com <mailto:langel at redhat.com>>:
> >
> > >
> > >
> > >
> > >     Camel Aissani wrote:
> > >     >
> > >     > Okay after reading the guide and readme. I set few environment
> > >     variables :
> > >     >
> > >     >
> ALT_BOOTDIR=$HOME/devel/hg/icedtea/bootstrap/jdk1.6.0
> > >     > ALT_BINARY_PLUGS_PATH=$HOME/plugs
> > >     > ALT_CUPS_HEADERS_PATH=/usr/include
> > >     > ALT_FREETYPE_LIB_PATH=/usr/lib
> > >     > ALT_FREETYPE_HEADERS_PATH=/usr/include
> > >     >
> > >     > After that the "make sanity" was ended successfully.
> > >     > Currently, I can't compile the jdk because of this stack trace:
> > >     >
> > >     > Exception in thread "main" java.lang.NoClassDefFoundError:
> > >     > org/apache/tools/ant/launch/Launcher
> > >     > Caused by: java.lang.ClassNotFoundException:
> > >     > org.apache.tools.ant.launch.Launcher
> > >     >         at java.net.URLClassLoader$2.run(URLClassLoader.java:220)
> > >     >         at
> java.security.AccessController.doPrivileged(Native
> > >     Method)
> > >     >         at
> > >
> java.net.URLClassLoader.findClass(URLClassLoader.java:209)
> > >     >         at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
> > >     >         at
> > >
> sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
> > >     >         at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
> > >     >         at
> > >
> java.lang.ClassLoader.loadClassInternal(ClassLoader.java:336)
> > >     > Error: Could not find the main class.
> > >     > Error: A JNI error has occurred, please check your installation
> and
> > >     > try again
> > >     >
> > >     > I found an email that speaks about this
> > >     ClassNotFoundException,  but I
> > >     > don't know how I can fix this problem.
> > >     >
> > >
> http://mail.openjdk.java.net/pipermail/distro-pkg-dev/2008-February/001203.html
> > >     >
> > >     > An idea ?
> > >
> > >
> > >     This was fixed. Update the repo
> > >
> > >     Lillian
> > >
> > >
> > >
> > >     >
> > >     > Thanks,
> > >     > Camel
> > >     >
> > >     > 2008/3/20, David Herron <David.Herron at sun.com
> > >     <mailto:David.Herron at sun.com>
> > >
> >
> > >     > <mailto:David.Herron at sun.com <mailto:David.Herron at sun.com>>>:
> >
> > >
> > >     >
> > >     >
> > >     >     http://openjdk.java.net/guide/ -- it's still a work in
> progress
> > >     >     and if you have any questions perhaps you can ask in the
> > >     >     guide-discuss list to get clarifications.
> > >     >
> > >     >     Yes you can use an IDE to work on OpenJDK changes but your
> 'IDE'
> > >     >     can also be "ed" or "vi".  It's up to individual preference.
> > >     >
> > >     >     In the OpenJDK and OpenJDK6 source trees there are some
> netbeans
> > >     >     projects that can help you get started.  They are in
> > >     >     'jdk/make/netbeans' (if I remember the path right)
> > >     >
> > >     >     The important README's within the source tree are:
> > >     >
> > >     >         README-builds.html
> > >     >         jdk/make/README
> > >     >         jdk/make/netbeans/README
> > >     >
> > >     >     They give information about configuring your environment.
> > >     >
> > >     >     The recent discussion you're seeing about Visual Studio is
> very
> > >     >     recent.  Most of us are on other platforms.  I regularly
> compile
> > >     >     on Ubuntu w/o problem.  No need to be on Windows unless that's
> > >     >     your cup of tea, of course.
> > >     >
> > >     >     In Elliotte's article, if he'd read the README's beforehand he
> > >     >     woulda had an easier time ;-)
> > >     >
> > >     >     - David Herron
> > >     >
> > >     >
> > >     >
> > >     >     Camel Aissani wrote:
> > >     >>     Hi,
> > >     >>
> > >     >>     I would like to contribute to the openjdk, but I wasn't able
> to
> > >     >>     find a document that explains how to make my first hack :(
> > >     >>     At this time, I have a fedora 8 distribution and I had
> compile
> > >     >>     the entire icedtea project.
> > >     >>     Many thanks to Sylvain for your french wiki it was very
> > >     useful ;-)
> > >     >>
> > >     >>     Now I don't know if I can use an IDE to hack (Netbeans,
> > >     >>     eclipse...). Sorry for the purist...I am a javaboy and I
> > >     like my IDE.
> > >     >>     In many emails about icedtea, I read a lot of stuff arround
> > >     >>     Visual Studio...I hope that I will be able to hack without
> > >     windows.
> > >     >>
> > >     >>     Two days ago, I tried to compile the openjdk in debug mode. I
> > >     >>     failed...
> > >     >>     I read this article
> > >     >>
> > >
> http://today.java.net/pub/a/today/2007/11/29/building-the-jdk.html
> > >     >>     where there is a lot information.
> > >     >>     Could you give me other links where I can find a simpliest
> > >     way to
> > >     >>     compile the jdk on fedora?
> > >     >>
> > >     >>     Cheers
> > >     >>     Camel
> > >     >>
> > >     >>
> > >
> > >     >>     2008/3/20, Mark Wielaard <mark at klomp.org
> >
> > >     <mailto:mark at klomp.org> <mailto:mark at klomp.org
> >
> > >     <mailto:mark at klomp.org>>>:
> > >
> > >     >>
> > >     >>         Hi Sylvain,
> > >     >>
> > >     >>
> > >     >>         On Wed, 2008-03-19 at 22:33 +0100, Sylvain Beucler wrote:
> > >     >>         > (My apologizes if that's not the right list to ask, I
> > >     >>         didn't find
> > >     >>         > other contact adresses)
> > >     >>
> > >     >>
> > >     >>         You are right. There is no other contact address. This
> list
> > >     >>         is it!
> > >     >>
> > >     >>
> > >     >>         > I would like to contribute IcedTea build instructions
> for
> > >     >>         Debian on
> > >     >>         > the wiki. I have a French version here:
> > >     >>         >
> http://doc.cliss21.com/index.php?title=IcedTea
> > >     >>
> > >     >>
> > >     >>         Nice and thanks!
> > >     >>
> > >     >>
> > >     >>         > Apparently account creation is blocked.
> > >     >>         > What is the procedure to register one?
> > >     >>
> > >     >>
> > >     >>         Sorry about the account creation being blocked.
> > >     >>         Unfortunately spammers learned how to create accounts
> > >     and...
> > >     >>         sniff :{
> > >     >>         So for now you just have to ask on this list and an
> account
> > >     >>         for your
> > >     >>         email address will be created. I just did this for you.
> > >     >>
> > >     >>         Cheers,
> > >     >>
> > >     >>
> > >     >>         Mark
> > >     >>
> > >     >>
> > >     >
> > >
> > >
> >
> >
>
>


-- 
Andrew :-)

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