compiling and running java applications

[mazazino]

hey..so i downloaded jdk 1.5 on my kubuntu..now i compile and run java apps normally on this OS simulator called OSP2..anyway its manual says that i have to set a PATH variable for bash by placing the following in the .bashrc file in the home directory:
PATH=/usr/local/bin/jdk:$PATHexport PATH

anyway, i tried appending that line of code to the end of that file, and when i tried doing this on the terminal:

java -cp .:Demo.jar osp.OSP

it gave me this list of errors

Initializing GUI, please wait ...
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.getLocalGraphicsEnvironment(libgcj.so.70)
   at java.awt.Window.<init>(libgcj.so.70)
   at java.awt.Frame.<init>(libgcj.so.70)
   at javax.swing.JFrame.<init>(libgcj.so.70)
   at osp.l.g.int(Unknown Source)
   at osp.l.g.for(Unknown Source)
   at osp.l.g.a(Unknown Source)
   at osp.l.g.<init>(Unknown Source)
   at osp.e.c.goto(Unknown Source)
   at osp.OSP.main(Unknown Source)
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)
   ...10 more

so im guessing that the problem is with jdk not being recognized by the OS..any ideas?..and if u dont know about osp2, any ideas on how i can introduce jdk1.5 to kubuntu and compile and run java apps normally?...any help would be appreciated..

[Cabhan]

Here is a guide to installing Java on Ubuntu (from the Ubuntu wiki):
https://help.ubuntu.com/community/Java

You want to install the Sun JDK.

The error you are getting involves the use of some nonstandard library with Java, and can probably be solved somehow by modifying the CLASSPATH. However, I suggest installing Java natively (and not through a simulator) before trying anything else.

[mazazino]

what do u mean natively?...i downloaded the jdk1.5 and installed it on the desktop..it was a bin file and i unpacked it using the normal ./jdk.bin...is that what u mean by natively?..and another thing..i read something about modifying the PATH variable..how can we do that exactly?

[mazazino]

never mind..it worked..i figured out how to modify the PATH variable in .bashrc..thanks

[scm]

By putting the "export PATH" on a separate line?