大神们帮我看看，快被jtable给搞死了

新手刚接触jtable，快被搞死了，弄了几天都没出来，想点击查询， jtable上只显示查询出来的这一条数据，不知道我代码哪里有问题，每次点击，都报空指针，
import java.util.Vector;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;public class Test extends javax.swing.JFrame {    public Test() {
        initComponents();
        setLocationRelativeTo(null);//界面居中
    }
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {        jPanel1 = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();
        jTextField1 = new javax.swing.JTextField();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable(entity.getCustomerInfo(),getTitles());        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);        jButton1.setText("查询");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });        jTextField1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField1ActionPerformed(evt);
            }
        });        jScrollPane1.setViewportView(jTable1);        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(10, 10, 10)
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 375, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(12, 12, 12)
                        .addComponent(jTextField1)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 72, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(24, 24, 24))))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(29, 29, 29)
                        .addComponent(jButton1))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addGap(18, 18, 18)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 153, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(20, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );        pack();
    }// </editor-fold>                            private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {                                                }                                           
 
    private DefaultTableModel tableModel;
    
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                                 entity.searchCustomer(getName());
        System.out.println(entity.searchCustomerInfo);
        tableModel.addRow(entity.searchCustomerInfo);        jTable1.setModel(tableModel);
    }                                            public Vector getTitles() {
        Vector title = new Vector();
        title.add("id");
        title.add("name");
        title.add("age");
        return title;
    }
    Entity entity = new Entity();    public Entity getEntity() {
        return entity;
    }    public void setEntity(Entity entity) {
        this.entity = entity;
    }    public String getName() {
        return new String(jTextField1.getText());
    }    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Test().setVisible(true);
            }
        });
    }
  
    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable jTable1;
    private javax.swing.JTextField jTextField1;
    // End of variables declaration                   
}这个是我调用数据库的方法
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Vector;
import javax.swing.JOptionPane;
/**
 *
 * @author Administrator
 */
public class Entity {  
    public static Vector rowDataCustomer = new Vector();    public static Vector getCustomerInfo() {
        String sql = "select * from users_xiey";
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        //  Vector rowData = new Vector();
        try {
            conn = ConnectionUtils.getConnection();
            stmt = conn.createStatement();
            rs = stmt.executeQuery(sql);            while (rs.next()) {
                Vector vcRows = new Vector();
                vcRows.add(rs.getString(1));
                vcRows.add(rs.getString(2));
                vcRows.add(rs.getString(3));
                rowDataCustomer.add(vcRows);
            }
        
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            ConnectionUtils.close(rs);
            ConnectionUtils.close(stmt);
            ConnectionUtils.close(conn);
        }
           return rowDataCustomer;
    }
         public Vector searchCustomerInfo = new Vector();
    public void searchCustomer(String name) {
        String sql = "select * from users_xiey where name like'%" + name + "%'";
        //  System.out.println(sql);
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        //  Vector rowData = new Vector();
        try {
            conn = ConnectionUtils.getConnection();
            stmt = conn.createStatement();
            rs = stmt.executeQuery(sql);            while (rs.next()) {
                // Vector vcRows = new Vector();
                searchCustomerInfo.add(rs.getString("id"));
                searchCustomerInfo.add(rs.getString("name"));
                searchCustomerInfo.add(rs.getString("age"));
                //customerInfo.add(vcRows);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            ConnectionUtils.close(rs);
            ConnectionUtils.close(stmt);
            ConnectionUtils.close(conn);
        }    }    public static void main(String[] arg) {
        getCustomerInfo();
    }
}
这个是我的界面