Some Object dont work after restoring it from the filesystem

Question

Hi !
I have a JFrame and in this I have a JPanel.
In the JPanel I have a JTabbedPane.
If I store the JTabbedPane to the filesystem using ObjectOutputStream and than restore it by using the ObjectInputStream some JTextFields in the JTabbedPane dont work correct. The most Objects work okay.
Do I have some problems with the pointer or is the reference lost ? I have 40 Objects and 2 or 3 are frozen after loading the JTabbedPane. Hmm...
Some lines of the code:
<code>
// WRITE OBJECT
if (e.getSource() == jMenuPosSpeichern)
{ try
{ ObjectOutputStream stream = new ObjectOutputStream(new FileOutputStream("c:\\test.dat"));
stream.writeObject(jTabbedPane);
stream.flush();
stream.close();
catch (IOException e9) {e9.printStackTrace();}
// READ OBJECT
if (e.getSource() == jMenuPosOeffnen)
{ try
{ ObjectInputStream stream = new ObjectInputStream(new FileInputStream("c:\\test.dat"));
contentPane.remove(jTabbedPane);
contentPane.repaint();
jTabbedPane=(JTabbedPane)stream.readObject();
stream.close();
contentPane.add(jTabbedPane);
catch (Exception e8) {e8.printStackTrace();}
</code>

Answer 1

No they are not different.
On the first register of the JTabbedPane I have 2 JTextFields an one JComboBox. The first JTextField is frozen. After trying sometimes the second field is frozen.
Is my way to store an object the correct way or is there a better way available ?
The relevant fields have this line in the source.
(code)
....class...
JTextField name = new JTextField(30);
....constructor....
jTabbedPane.addTab("register1",reg1);
reg1.add(name);
name.setBounds(170,100,200,20);
(/code)
All my fields I add to a Tab of a JTabbedPane and all the Field have setBounds. No difference to the other objects.
Thx Wolfgang