GCJ compiles fine, but I get cast exception

GCJ compiles fine, but I get cast exception

[Ciamak Abkai]

Hi all,

I try to run prefuse applying gcj.   There is a problem with the 
following cast :

    Graphics2D g2D = (Graphics2D)g;



gcj-info :
Using built-in specs.
Reading specs from /usr/lib/gcc/x86_64-pc-linux-gnu/4.1.2/libgcj.spec
rename spec lib to liborig
Target: x86_64-pc-linux-gnu
Configured with: 
/var/tmp/portage/sys-devel/gcc-4.1.2/work/gcc-4.1.2/configure 
--prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.1.2 
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.1.2/include 
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.1.2 
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.1.2/man 
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.1.2/info 
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.1.2/include/g++-v4 
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec 
--enable-nls --without-included-gettext --with-system-zlib 
--disable-checking --disable-werror --enable-secureplt --enable-multilib 
--enable-libmudflap --disable-libssp --enable-java-awt=gtk 
--enable-languages=c,c++,java,treelang,fortran --enable-shared 
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
Thread model: posix
gcc version 4.1.2 (Gentoo 4.1.2 p1.1)



Exception during event dispatch:
Exception in thread "prefuse_ActivityManager" 
java.lang.ClassCastException: gnu.java.awt.peer.gtk.GdkGraphics cannot 
be cast to java.awt.Graphics2D at 
prefuse.Display.paintComponent(Display.java:795)



Do you have an idea how to solve the Problem ?
Thank you

Ciamak

Re: GCJ compiles fine, but I get cast exception

[Andrew Haley]

Ciamak Abkai wrote:

> I try to run prefuse applying gcj.   There is a problem with the
> following cast :
> 
>    Graphics2D g2D = (Graphics2D)g;

> 
> Exception during event dispatch:
> Exception in thread "prefuse_ActivityManager"
> java.lang.ClassCastException: gnu.java.awt.peer.gtk.GdkGraphics cannot
> be cast to java.awt.Graphics2D at
> prefuse.Display.paintComponent(Display.java:795)
> 
> 
> 
> Do you have an idea how to solve the Problem ?

GdkGraphics doesn't extend Graphics2D.  Do you have any reason to
believe that it should?  It extends Graphics.

Andrew.

Re: GCJ compiles fine, but I get cast exception

[Robert Schuster]

[-- Attachment #1: Type: text/plain, Size: 424 bytes --]

Hi,

Andrew Haley schrieb:
>>    Graphics2D g2D = (Graphics2D)g;
> GdkGraphics doesn't extend Graphics2D.  Do you have any reason to
> believe that it should?  It extends Graphics.
Typical implementation issue. On the other class library this is
possible always. Once upon a time I found this written down somewhere.

@Ciamak: You need a newer GCJ. In more recent versions the cast will work.

Regards
Robert


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 260 bytes --]