Java-TextField not usable

[nzuri]

hi.
i have problems with ubuntu, java and textfield/area.
when i write a simple applet with this code:

import java.awt.*;

public class applet extends java.applet.Applet {

TextArea ta;
TextField tf;

@Override
public void init () {
setLayout(new BorderLayout());

Panel p = new Panel (new BorderLayout());
add(p,BorderLayout.NORTH);

//Textarea bsp.
ta = new TextArea("Dies ist ein Textbereich, und den sollte man nurtzen",10,25);
p.add(ta);

//Textfiel bsp.
tf = new TextField(15);
tf.setText("Test");

add(tf,BorderLayout.SOUTH);

}

@Override
public void start () {

}

@Override
public void stop () {

}

@Override
public void destroy () {

}

}
and then run it with appletviewer i get the following errors:



Warning: Cannot convert string "-b&h-luxi sans-medium-r-normal--*-140-*-*-p-*-iso8859-1" to type FontStruct
Warning: Cannot convert string "-arphic-ar pl shanheisun uni-medium-r-normal--*-*-*-*-p-*-iso10646-1" to type FontStruct
Warning: Cannot convert string "-arphic-ar pl uming uni-medium-r-normal--*-*-*-*-p-*-iso10646-1" to type FontStruct
Warning: Cannot convert string "-kochi-gothic-medium-r-normal--*-140-*-*-c-*-jisx0208.1983-0" to type FontStruct
Warning: Cannot convert string "-sazanami-gothic-medium-r-normal--*-140-*-*-c-*-jisx0208.1983-0" to type FontStruct
Warning: Cannot convert string "-baekmuk-gulim-medium-r-normal--*-140-*-*-c-*-ksc5601.1987-0" to type FontStruct
Warning:
Name: textfield
Class: XmTextField
Character 'T' not supported in font. Discarded.
.
.
.
and so on
the applet looks like this: http://img684.imageshack.us/img684/3987/bildschirmfotozg.png
and it's not possible to write in the textfield/area

every applet i run has the "Convert-Errors" but i never had further problems with them.

what can be the reason for not supporting simple characters?

it's really annoying, because i have so many problems with java and ubuntu... i hope this time it's my fault :).
or anybody knows a solution?

greez nzuri

p.s.:
:/$ java -version
java version "1.6.0_15"
Java(TM) SE Runtime Environment (build 1.6.0_15-b03)
Java HotSpot(TM) Server VM (build 14.1-b02, mixed mode)