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Re: java.awt.AWTError: Cannot load AWT toolkit: gnu.java.awt.peer.gtk.GtkToolkit

David Herron wrote:


An off the top of my head guess would be - do you have GNOME installed?
Reasoning ... GtkToolkit refers to GNOME and would be using the GNOME widgets as peers in the same manner the Motif widgets were formerly used. 

- David


On Nov 2, 2006, at 5:57 AM, Clayton wrote:


Hi,
I am not so familiar with Java, and I am trying to get my brokers Java trading app working on my notebook. I am running Debian Etch with the following Java environment installed: 

$ wajig list-installed | grep java
java-common
java-gcj-compat
libhsqldb-java
libjaxp1.2-java
libjline-java
libservlet2.3-java
libxalan2-java
libxerces2-java
libxt-java
openoffice.org-java-common
sun-java5-bin
sun-java5-demo
sun-java5-fonts
sun-java5-jdk
sun-java5-jre
sun-java5-plugin

When I try to invoke the app, the following happens:
s$ java -cp jts.jar:pluginsupport.jar:jcommon-1.0.0.jar:jfreechart-1.0.0.jar:jhall.jar:other.jar:rss.jar -Xmx256M jclient.LoginFrame . Exception in thread "JTS-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.getLocalGraphicsEnvironment(libgcj.so.70) 
   at java.awt.Window.<init>(libgcj.so.70)
   at java.awt.Frame.<init>(libgcj.so.70)
   at java.awt.Frame.<init>(libgcj.so.70)
   at javax.swing.SwingUtilities$OwnerFrame.<init>(libgcj.so.70)
   at javax.swing.SwingUtilities.getOwnerFrame(libgcj.so.70)
   at javax.swing.JOptionPane.<clinit>(libgcj.so.70)
   at java.lang.Class.initializeClass(libgcj.so.70)
   at jutils.td.a(td.java:69)
   at jutils.xb.a(xb.java:105)
   at jutils.xb.b(xb.java:69)
   at jclient.LoginFrame.a(LoginFrame.java:308)
   at jclient.LoginFrame.b(LoginFrame.java:290)
   at jclient.LoginFrame.main(LoginFrame.java:448)
Caused by: java.lang.NoClassDefFoundError: gnu.java.awt.peer.gtk.GtkToolkit 
   at java.lang.Class.initializeClass(libgcj.so.70)
   at java.lang.Class.forName(libgcj.so.70)
   at java.awt.Toolkit.getDefaultToolkit(libgcj.so.70)
   ...14 more
It looks like maybe something isn't installed or a configuration problem, any suggestions?
I have this same Java app working on my desktop, so I know it works, but I am using older Java packages on the desktop, so I am not sure the two machines are really comparable. 

Note the "libgcj" bits in the error message.
Here is the simple and pragmatic solution if you do not have issues with using "non free" software:
Whenever you get error messages with that substring in them, install Sun Java, remove GCJ if you can, and ensure that your Linux installation (other operating systems do not exhibit this problem as far as I know) is configured to use Sun Java for any Java application (each Linux distribution may have a different approach to configuring which "Java" implementation to use).
(It is good that you reported to this list, feedback to developers is very important.) 



With best regards

Blackwell
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