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OMRebel
April 30th, 2007, 01:13 AM
Hey guys, I'm taking a Java course, and am running into a problem. Here's some info:
Ubuntu 7.04
Eclipse 3.2.2

brad@brad-desktop:~$ java -version
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode, sharing)


I've uploaded the simple Java file that I'm trying to run. But, I get the following errors:
Exception in thread "main" java.awt.AWTError: Cannot load AWT toolkit: gnu.java.awt.peer.gtk.GtkToolkit
at java.awt.Toolkit.getDefaultToolkit(libgcj.so.70)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvir onment(libgcj.so.70)
at java.awt.Window.<init>(libgcj.so.70)
at java.awt.Frame.<init>(libgcj.so.70)
at ChatClient.launchFrame(ChatClient.java:26)
at ChatClient.main(ChatClient.java:46)
Caused by: java.lang.UnsatisfiedLinkError: libgtkpeer: libgtkpeer.so: cannot open shared object file: No such file or directory
at java.lang.Runtime._load(libgcj.so.70)
at java.lang.Runtime.loadLibrary(libgcj.so.70)
at java.lang.System.loadLibrary(libgcj.so.70)
at gnu.java.awt.peer.gtk.GtkToolkit.<clinit>(libgcj.so.70)
at java.lang.Class.initializeClass(libgcj.so.70)
at java.lang.Class.forName(libgcj.so.70)
at java.awt.Toolkit.getDefaultToolkit(libgcj.so.70)
...5 more

How do I get this straightened out?
Thanks!

OMRebel
April 30th, 2007, 01:33 AM
Figured it out. It was a setting in Eclipse that I had to change. For those that might be having the same problem, whenever you run the application, go to the JRE tab, and make sure Sun is selected, and not the gcj. For me, I had to add the Sun version to the list. See screenshot for how I set it up. But, it's working now. :o)

Maxamor
May 3rd, 2007, 02:37 AM
Thanks a BUNCH. This really helped me out and your screenshot was exceptional. My issues are solved now, too.

Thanks again!

mlago
May 6th, 2007, 09:11 AM
Thanks a lot, helpful for me also

zuzuzzzip
July 26th, 2007, 07:30 PM
nice one :)
Thanks!

muzzamo
August 8th, 2007, 01:31 PM
For the record, I was getting this problem when trying to create a visual class in eclipse and using the drag and drop swing tools. The widgets in the preview were not showing, just with a little red cross. Hover over them to get the no class def found error on eclipse gnu.java.awt.peer.gtk.GtkToolkit .

sudo apt-get install sun-java6-jre

will install the jre.

Then had to follow the instructions here:

http://wiki.liferay.com/index.php/Liferay_Development_Environment:_Ubuntu_Linux#Ecli pse_IDE

To change the jvm.

rwales
September 12th, 2007, 12:19 PM
Thanks a lot OMRebel & muzzamo. I've just run into the same problem using swing & your comments fixed it.