Cannot load AWT toolkit ??

[derby007]

I'm getting the following error when i try and run my Java Application from the command line. Does anybody know how i might fix it ?

I tried setting different LooknFeel's but I still get the same error....
Is the libgcj.so.7 library/file causing me a problem?
Note: its a simple application, with just a few buttons, with standard layouts, & no fancy outside libraries/jars.

:confused:


>>>java -jar SBWithMain.jar
Exception in thread "main" java.awt.AWTError: Cannot load AWT toolkit: gnu.java.awt.peer.gtk.GtkToolkit
at java.awt.Toolkit.getDefaultToolkit(libgcj.so.7)
at java.awt.EventQueue.invokeLater(libgcj.so.7)
at smallbyteswithmain.Main.main(Main.java:35)
Caused by: java.lang.ClassNotFoundException: gnu.java.awt.peer.gtk.GtkToolkit
at java.lang.Class.forName(libgcj.so.7)
at java.lang.Class.forName(libgcj.so.7)
at java.awt.Toolkit.getDefaultToolkit(libgcj.so.7)
...2 more

[Ragazzo]

GCJ doesn't support AWT or Swing. You need to use Sun's Java.

[derby007]

em..........I don't understand......can I not run my file using a different Look&Feel ??

And I'm using Sun Java Studio Enterprise 8 !!

Please elaborate, as I try to understand my problems....

[laxmanb]

You don't have Sun's Java set up properly... for eg. type java -version and youll notice that you're not using the Sun's Hotspot JRE. You're using the GNU Compiler for Java... (something like that)

use update-alternatives @ the terminal... I think you can choose Sun's Java as the default JRE using that program...

[derby007]

Cheers....:)

[derby007]

Bump:
New problem: i tried to run it on a WinXP machine but got this error:

>>java -jar smallb1.jar

Exception in thread "main" java.lang.UnsupportedClassVersionError: smallb1/mainGUI (Unsupported major.minor version 49.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknow n Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)

where Java Version is:
>>java -version
java version "1.4.2_03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_03-b02)
Java HotSpot(TM) Client VM (build 1.4.2_03-b02, mixed mode)

Any ideas, pls?
note: this PC has JRE 1.4 & JDK 1.5.....