JPanel, GridbagLayout - change size when click event

Question

Hello
i have a problem. I using a JPanel with different components, which are ordered with a gridbag layout.
So, when i click on the panel the size the textarea change the size.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.Border;
public class FileTypesTab extends JPanel {
Constants_SIZE SIZE = new Constants_SIZE();
Constants_DE TEXT = new Constants_DE();
JPanel jFileTypePanelCenter = new JPanel();
JButton jFileTypeButtonAdd = new JButton(TEXT.BUTTON_ADD);
JButton jFileTypeButtonChange = new JButton(TEXT.BUTTON_CHANGE);
JButton jFileTypeButtonRemove = new JButton(TEXT.BUTTON_REMOVE);
JScrollPane jScrollPane1 = new JScrollPane();
JScrollPane jScrollPane2 = new JScrollPane();
JTextArea jFileTypesText = new JTextArea(TEXT.DESC_FILE_TYPES_TEXT);
DefaultListModel listModel = new DefaultListModel();
JList jFileTypes = new JList(listModel);
BorderLayout bl1 = new BorderLayout();
GridBagLayout gbl = new GridBagLayout();
public FileTypesTab() {
try {
jbInit();
catch(Exception e) {
e.printStackTrace();
private void jbInit() throws Exception {
this.setRequestFocusEnabled(false);
this.setLayout(bl1);
jFileTypeButtonAdd.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jFileTypeButtonAdd_actionPerformed(e);
jFileTypeButtonRemove.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jFileTypeButtonRemove_actionPerformed(e);
jFileTypes.setAutoscrolls(false);
this.add(jFileTypePanelCenter, BorderLayout.CENTER);
//Layout setzen und Komponenten hinzuf�gen
jFileTypePanelCenter.setLayout(gbl);
jFileTypePanelCenter.setBorder(BorderFactory.createEtchedBorder());
// FileType Text initialisieren und hinzuf�gen
jFileTypesText.setLineWrap(true);
jFileTypesText.setEditable(false);
jFileTypesText.setCaretPosition(0);
jFileTypesText.setBackground(Color.lightGray);
jFileTypePanelCenter.add(jScrollPane1, new GridBagConstraints(0, 0, 1, 4, 1.0, 1.0
,GridBagConstraints.NORTHWEST, GridBagConstraints.BOTH, new Insets(5, 5, 5, 5), 0, 0));
jScrollPane1.setRequestFocusEnabled(false);
jScrollPane1.getViewport().add(jFileTypesText, null);
// FileType Liste initialisieren und hinzuf�gen
jScrollPane2.setVerticalScrollBarPolicy(jScrollPane2.VERTICAL_SCROLLBAR_ALWAYS);
jScrollPane2.setHorizontalScrollBarPolicy(jScrollPane2.HORIZONTAL_SCROLLBAR_ALWAYS);
jFileTypes.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
jFileTypes.setVisibleRowCount(15);
jScrollPane2.setPreferredSize( new Dimension(
SIZE.FILETYPE_LIST_WEIGHT,SIZE.FILETYPE_LIST_HEIGHT));
jFileTypePanelCenter.add(jScrollPane2, new GridBagConstraints(1, 0, 1, 4, 1.0, 1.0
,GridBagConstraints.NORTH, GridBagConstraints.BOTH, new Insets(5, 5, 5, 5), 0, 0));
jScrollPane2.getViewport().add(jFileTypes, null);
// Buttons Add,Change,Remove hinzuf�gen
jFileTypePanelCenter.add(jFileTypeButtonAdd, new GridBagConstraints(2, 0, 1, 1, 1.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(5, 5, 0, 5), 0, 0));
jFileTypePanelCenter.add(jFileTypeButtonChange, new GridBagConstraints(2, 1, 1, 1, 0.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(5, 5, 0, 5), 0, 0));
jFileTypePanelCenter.add(jFileTypeButtonRemove, new GridBagConstraints(2, 2, 1, 1, 0.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(5, 5, 0, 5), 0, 0));
void jFileTypeButtonAdd_actionPerformed(ActionEvent e) {
for(int i=0; i < 15; i++) {
listModel.addElement("Element" + i);
jFileTypes.validate();
jFileTypes.repaint();
void jFileTypeButtonRemove_actionPerformed(ActionEvent e) {
listModel.removeElementAt(jFileTypes.getSelectedIndex());
THX Tom

Answer 1

Do one thing
set minimumSize and maximum size of the component as your preferred size of the component.
component.setMaximumSize(100,20);
component.setMinimumSize(100,20);
component.setPreferredSize(100,20);
Also set fill to NONE.
constraintsb .fill = java.awt.GridBagConstraints.NONE;
This will solve your problem