Re: [Jamvm-general] Unable to run GUI application using cross-compiled jamvm for arm

[Xerxes R. <xe...@za...>]

Adityadham wrote:
> 
> Thanks for your reply Xerxes. I made 2 different changes while compiling
> GNU Classpath. Both compiled successfully.
> ...
> 2. This was another variation which I tried in which I disabled gtk and
> default toolkil I gave of X.
> GNU Classpath
> ./configure --host=arm-xscale-linux-gnueabi  --prefix=/usr/local
> --disable-examples --with-x --disable-qt-peer --disable-gtk-peer
> --disable-gconf-peer --disable-plugin --enable-alsa --disable-dssi
> --with-escher=/home/warrior/java-project/escher-0.3/src  
> --enable-local-sockets --enable-collections --enable-xmlj --disable-Werror 
> --enable-tools  --enable-default-toolkit=gnu.java.awt.peer.x.XToolkit 
> 
> After transferring the above compiled gnu classpath and jamvm to the
> device, when I run a sample swing application, it gives me following
> error:
> 
> Exception in thread "main" java.lang.ExceptionInInitializerError
>    at gnu.java.awt.peer.x.XToolkit.getClasspathFontPeer(XToolkit.java:208)
>    at java.awt.Font.getPeerFromToolkit(Font.java:329)
> ...
> Caused by: java.lang.NullPointerException
>    at java.io.InputStreamReader.<init>(InputStreamReader.java:208)
>    at java.util.Properties.load(Properties.java:380)
>    at
> gnu.java.awt.font.OpenTypeFontPeer.<clinit>(OpenTypeFontPeer.java:93)
>    at gnu.java.awt.peer.x.XToolkit.getClasspathFontPeer(XToolkit.java:208)
> 
> 
> I am still not able to figure out what I am missing. Can you please give
> me further pointers to that I can move in correct direction.
> 
> Thanks
> 

The error above at
gnu.java.awt.font.OpenTypeFontPeer.<clinit>(OpenTypeFontPeer.java:93) if you
look at the source code for gnu classpath you can see that the null pointer
is caused by some issue for gnu classpath to locate the font.properties
resource file, that contains a list of system fonts to use for awt and
swing.
Most likely you have missed to copy some required file to your arm board or
the classpath do not contain the jar containing the
resource/gnu/java/awt/font/fonts.properties .
Remember that custom gnu classpath configure setups with lots of --enable
and --disable options are naturally much less tested by other gnu classpath
developers compared to using the default settings without any extra --enable
or --disable options.

None of these errors looks to be JamVM related therefore I recommend you to
ask classpath swing setup and configure questions on the GNU Classpath
mailinglist:
http://savannah.gnu.org/mail/?group=classpath

You may want to try run JamVM in combination with the OpenJDK classes that
also provide AWT and Swing support.

Cheers
Xerxes
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