Why the JScrollPane not scroll?

I create a dialog,then I put a JScrollPane on the dialog,after this I put a JPanel on the JScrollPane,
finally I put many checkbox on the JPanel.Due to having many checkboxes, I hope that JScrollPane can scroll,but it cannot scroll .how can I sove this problem?
the following is my code:
this.setSize(new Dimension(543, 523));
this.getContentPane().setLayout(null);
jButton3.setText("ok");
jButton3.setBounds(new Rectangle(235, 455, 95, 30));
jButton4.setText("cancel");
jButton4.setBounds(new Rectangle(395, 455, 100, 30));
// jScrollPane1.setBounds(new Rectangle(0, 20, 515, 1195));
// jScrollPane1.setAutoscrolls(true);
jPanel1.setBackground(Color.cyan);
jPanel1.setLayout(null);
jPanel1.setAutoscrolls(true);
jPanel1.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED));
jCheckBox1.setText("attrib_manager");
jCheckBox1.setBounds(new Rectangle(10, 10, 110, 25));
��
jCheckBox66.setBounds(new Rectangle(205, 1120, 97, 26));
jCheckBox66.setEnabled(false);
��
jPanel1.add(jCheckBox66, null);
jPanel1.add(jCheckBox1, null);
JScrollPane jScrollPane1 = new JScrollPane(jPanel1);
jScrollPane1.setBounds(new Rectangle(0, 20, 515, 425));
jScrollPane1.setAutoscrolls(true);
jScrollPane1.getViewport().add(jPanel1, null);
this.getContentPane().add(jScrollPane1, null);
this.getContentPane().add(jButton4, null);
this.getContentPane().add(jButton3, null);

You have to set size of your panel.
override method getPrefferedSize() of panel. This methd should return correct size of content.
best regadrs
Stas

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chgEvent source == javax.swing.JViewport[,1,21,0x329,invalid,layout=javax.swing.ViewportLayout,alignmentX=null,alignmentY=null,border=,flags=8,maximumSize=,minimumSize=,preferredSize=java.awt.Dimension[width=0,height=0],isViewSizeSet=false,lastPaintPosition=,scrollUnderway=false]
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     at MyForm$2.stateChanged(MyForm.java:192)
     at javax.swing.JViewport.fireStateChanged(JViewport.java:1341)
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Thanks for your response. I examined the code and nowhere that I can see is it calling either of those two methods.
At some point, it looks like something within my code or in the UI frameworks that I'm using is invalidating my JScrollPane. I'm having a very difficult time, though, tracking down exactly which component is causing that invalidation.
Short of writing my own JScrollPane so that I can capture the stack trace of calls to invalidate(), does anyone have any suggestions for debugging this further? I tried to use a conditional breakpoint in Eclipse 2.1.3 (Component.invalidate() where the Component is an instance of JScrollPane), but my breakpoint is never being executed.
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