The component couldn't get smaller using gridbaglayout

Question

There is a vertical jsplitpane ,the upper part contains button,jtable,combox using gridbaglayout,I have set the GridBagConstraints.weightx,weighty to 1. The problem is when I drag divider to change upper size,it couldn't get smaller, even if I set all of the upper components' minimumsize to a tiny value.
here is the code, I wrote it in windowsbuilder (a kind of eclipse swing plugin), I guess you can see it using ve too.
package frame;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import java.awt.Rectangle;
import javax.swing.JSplitPane;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.JLabel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import java.awt.Color;
import javax.swing.JComboBox;
import javax.swing.JButton;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Insets;
public class FrmMain extends JFrame {
     private JPanel contentPane;
     private JTable table;
      * Launch the application.
     public static void main(String[] args) {
          createWin();
      * Create the frame.
     public FrmMain() {
          setTitle("Notebook");
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          setBounds(100, 100, 573, 465);
          setBounds(new Rectangle(0, 0, 980, 738));
          contentPane = new JPanel();
          contentPane.setBounds(new Rectangle(0, 0, 980, 0));
          contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
          contentPane.setLayout(new BorderLayout(0, 0));
          setContentPane(contentPane);
          JSplitPane splAll = new JSplitPane();
          splAll.setDividerSize(10);
          splAll.setOneTouchExpandable(true);
          contentPane.add(splAll, BorderLayout.CENTER);
          JSplitPane splRight = new JSplitPane();
          splRight.setContinuousLayout(true);
          splRight.setDividerSize(10);
          splRight.setOneTouchExpandable(true);
          splRight.setOrientation(JSplitPane.VERTICAL_SPLIT);
          splAll.setRightComponent(splRight);
          JPanel pnlRightUp = new JPanel();
          splRight.setLeftComponent(pnlRightUp);
          GridBagLayout gbl_pnlRightUp = new GridBagLayout();
          gbl_pnlRightUp.columnWidths = new int[]{36, 54, 227, 88, 88, 211, 0};
          gbl_pnlRightUp.rowHeights = new int[]{23, 363, 0};
          gbl_pnlRightUp.columnWeights = new double[]{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE};
          gbl_pnlRightUp.rowWeights = new double[]{0.0, 0.0, Double.MIN_VALUE};
          pnlRightUp.setLayout(gbl_pnlRightUp);
          JLabel label = new JLabel("\u5F53\u524D\u6709");
          GridBagConstraints gbc_label = new GridBagConstraints();
          gbc_label.anchor = GridBagConstraints.WEST;
          gbc_label.insets = new Insets(0, 0, 5, 5);
          gbc_label.gridx = 0;
          gbc_label.gridy = 0;
          pnlRightUp.add(label, gbc_label);
          JLabel lblCount = new JLabel("New label");
          lblCount.setForeground(Color.BLUE);
          GridBagConstraints gbc_lblCount = new GridBagConstraints();
          gbc_lblCount.anchor = GridBagConstraints.WEST;
          gbc_lblCount.insets = new Insets(0, 0, 5, 5);
          gbc_lblCount.gridx = 1;
          gbc_lblCount.gridy = 0;
          pnlRightUp.add(lblCount, gbc_lblCount);
          JComboBox tfKey = new JComboBox();
          GridBagConstraints gbc_tfKey = new GridBagConstraints();
          gbc_tfKey.fill = GridBagConstraints.HORIZONTAL;
          gbc_tfKey.insets = new Insets(0, 0, 5, 5);
          gbc_tfKey.gridx = 2;
          gbc_tfKey.gridy = 0;
          pnlRightUp.add(tfKey, gbc_tfKey);
          JLabel label_1 = new JLabel("\u6761");
          GridBagConstraints gbc_label_1 = new GridBagConstraints();
          gbc_label_1.anchor = GridBagConstraints.WEST;
          gbc_label_1.insets = new Insets(0, 0, 5, 5);
          gbc_label_1.gridx = 2;
          gbc_label_1.gridy = 0;
          pnlRightUp.add(label_1, gbc_label_1);
          JButton btnSearch = new JButton("\u641C\u7D22");
          GridBagConstraints gbc_btnSearch = new GridBagConstraints();
          gbc_btnSearch.anchor = GridBagConstraints.NORTH;
          gbc_btnSearch.fill = GridBagConstraints.HORIZONTAL;
          gbc_btnSearch.insets = new Insets(0, 0, 5, 5);
          gbc_btnSearch.gridx = 3;
          gbc_btnSearch.gridy = 0;
          pnlRightUp.add(btnSearch, gbc_btnSearch);
          JButton btnType = new JButton("\u7C7B\u522B\u7EF4\u62A4");
          GridBagConstraints gbc_btnType = new GridBagConstraints();
          gbc_btnType.anchor = GridBagConstraints.NORTH;
          gbc_btnType.fill = GridBagConstraints.HORIZONTAL;
          gbc_btnType.insets = new Insets(0, 0, 5, 5);
          gbc_btnType.gridx = 4;
          gbc_btnType.gridy = 0;
          pnlRightUp.add(btnType, gbc_btnType);
          JButton button_2 = new JButton("\u91CD\u65B0\u6253\u5F00\u7A97\u53E3");
          GridBagConstraints gbc_button_2 = new GridBagConstraints();
          gbc_button_2.anchor = GridBagConstraints.NORTHWEST;
          gbc_button_2.insets = new Insets(0, 0, 5, 0);
          gbc_button_2.gridx = 5;
          gbc_button_2.gridy = 0;
          pnlRightUp.add(button_2, gbc_button_2);
          JScrollPane spData = new JScrollPane();
          GridBagConstraints gbc_spData = new GridBagConstraints();
          gbc_spData.fill = GridBagConstraints.BOTH;
          gbc_spData.gridwidth = 6;
          gbc_spData.gridx = 0;
          gbc_spData.gridy = 1;
          gbc_spData.weightx=1;
          gbc_spData.weighty=1;
          pnlRightUp.add(spData, gbc_spData);
          table = new JTable();
          spData.setViewportView(table);
          JScrollPane scrollPane = new JScrollPane();
          splRight.setRightComponent(scrollPane);
          JTextArea taContent = new JTextArea();
          scrollPane.setViewportView(taContent);
          splRight.setDividerLocation(400);
          JScrollPane scrollPane_1 = new JScrollPane();
          splAll.setLeftComponent(scrollPane_1);
          JList lstType = new JList();
          scrollPane_1.setViewportView(lstType);
          splAll.setDividerLocation(180);
     public static void  createWin(){
          EventQueue.invokeLater(new Runnable() {
               public void run() {
                    try {
                         try {
                           UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                       } catch (ClassNotFoundException e) {
                           e.printStackTrace();
                       } catch (InstantiationException e) {
                           e.printStackTrace();
                       } catch (IllegalAccessException e) {
                           e.printStackTrace();
                       } catch (UnsupportedLookAndFeelException e) {
                           e.printStackTrace();
                         FrmMain frame = new FrmMain();
                         frame.setVisible(true);
                    } catch (Exception e) {
                         e.printStackTrace();
}thanks.

Answer 1

I found the reason. the code below defines the jtable height as 363 pixels,so the divider couldn't make the upper part less than 363 pixels. I don't know why divider cound't but draging win could. Gridbaglayout is so complex.
gbl_pnlRightUp.rowHeights = new int[]{23, 363, 0};if I use BorderLayout and put jtable into center in the upper part of splitpane, everything is ok. But if I had to use gridbaglayout,what was I gonna do?