help about class GroupLayout

[MaHa]

I get an error on compile .
I can't fix it


javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGap(0, 480, Short.MAX_VALUE)
);


cannot find symbol
symbol :class GroupLayout
location : package.javax.swing

outPut :

deps-jar:
compile:
run:
java.lang.NoClassDefFoundError: javax/swing/GroupLayout$Group
Exception in thread "main"
Java Result: 1
BUILD SUCCESSFUL (total time: 5 seconds)

-----------------------------------------
I ues NetBeans 6.0.1 and jdk1.5.0_16

please, please help me
I appreciate Any reply

[Norm]

Check the API doc for that class. What version of java is it in?
What version of java are you using?

[MaHa]

Dear Norm ,

I am grateful to you .

I appreciate your cooperation with me .

Thank you very much for help me .

I solved my problem. the problem in java version.
javax.swing.GroupLayout works only with JDK 1.6.



Thanks again ,

MaHa