Não aparece nehum erro, ele simplesmente não atualiza no banco de dados!!! Se eu alterar a instrução SQL para Insert ele Insere normalmente, o meu erro esta dentro dessa istrução SQL, mas não estou sabendo identificalo.
Estou enviando o codigo todo, tácerto eu sei que esta meio desorganizado e feio mas eu vou ajeitar isso!! 
import javax.swing.JInternalFrame;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import java.io.*;
import javax.swing.*;
public class AreaA extends JInternalFrame implements ItemListener, ActionListener{
static int openFrameCount = 0;
static final int xOffset = 40, yOffset = 40;
public AreaA() {
super("Alterar Área" + (++openFrameCount),
true, //resizable
true, //closable
false, //maximizable
true);//iconifiable
initComponents();
comboResolvedorRes();
cadastrar.addActionListener(this);
jComboBox1.addItemListener(this);
setSize(360,230);
setLocation(xOffset*openFrameCount, yOffset*openFrameCount);
}
private void initComponents(){//GEN-BEGIN:initComponents
jPanel3 = new javax.swing.JPanel();
jPanel5 = new javax.swing.JPanel();
jPanel1 = new javax.swing.JPanel();
Area = new javax.swing.JLabel();
jComboBox1 = new javax.swing.JComboBox();
jPanel4 = new javax.swing.JPanel();
cadastrar = new javax.swing.JButton();
//*
jPanel6 = new javax.swing.JPanel();
areaText = new JTextField();
Area2 = new javax.swing.JLabel();
//*
getContentPane().setLayout(new java.awt.FlowLayout(java.awt.FlowLayout.CENTER, 8, 1));
setTitle("Alterar u00c1rea");
setPreferredSize(new java.awt.Dimension(308, 260));
jPanel3.setLayout(new java.awt.GridLayout(4, 3, 2, 0));
jPanel3.setPreferredSize(new java.awt.Dimension(350, 200));
jPanel3.setAlignmentY(2.0F);
jPanel3.setAlignmentX(2.0F);
jPanel3.setMaximumSize(new java.awt.Dimension(250, 300));
jPanel5.setLayout(new java.awt.FlowLayout(java.awt.FlowLayout.CENTER, 5, 8));
jPanel3.add(jPanel5);
jPanel1.setLayout(new java.awt.FlowLayout(java.awt.FlowLayout.LEFT, 3, 8));
Area.setText("u00c1rea");
Area.setFont(new java.awt.Font("Arial", 1, 12));
Area.setPreferredSize(new java.awt.Dimension(70, 20));
Area.setAlignmentY(1.0F);
Area.setAlignmentX(1.0F);
Area.setMaximumSize(new java.awt.Dimension(70, 16));
jPanel1.add(Area);
jPanel1.add(jComboBox1);
jPanel3.add(jPanel1);
jPanel4.setLayout(new java.awt.FlowLayout(java.awt.FlowLayout.CENTER, 2, 8));
jPanel4.setPreferredSize(new java.awt.Dimension(150, 50));
cadastrar.setFont(new java.awt.Font("Arial", 1, 12));
cadastrar.setText("Consultar");
//*
Area2.setText("u00c1rea");
Area2.setFont(new java.awt.Font("Arial", 1, 12));
Area2.setPreferredSize(new java.awt.Dimension(70, 20));
Area2.setAlignmentY(1.0F);
Area2.setAlignmentX(1.0F);
Area2.setMaximumSize(new java.awt.Dimension(70, 16));
Area2.setVisible(false);
jPanel6.setLayout(new java.awt.FlowLayout(java.awt.FlowLayout.LEFT, 3, 8));
jPanel6.add(Area2);
areaText.setColumns(15);
areaText.setVisible(false);
jPanel6.add(areaText);
jPanel3.add(jPanel6);
//*
jPanel4.add(cadastrar);
jPanel3.add(jPanel4);
getContentPane().add(jPanel3);
pack();
}//GEN-END:initComponents
public void comboResolvedorRes() {
try
{
//Autenticação do DB
String url = "jdbc:odbc:conect";
String usuario = "";
String senha = "";
//Chama o drive de comexão JDBC
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
//Cria a conexão
Connection con;
con = DriverManager.getConnection(url,usuario,senha);
//Método para instrução SQL
Statement st = con.createStatement();
ResultSet rs = st.executeQuery("select area from area");
while(rs.next()){
jComboBox1.addItem(rs.getString("area"));
}
// st.close();
// con.close();
}
//Tratamento em caso de falha na conexão com DB
catch (Exception e) {
// JOptionPane.showMessageDialog(null,"Problemas com o banco de dados!");
}
}
//* inicio
public void itemStateChanged(ItemEvent e) {
if( e.getStateChange() == ItemEvent.SELECTED ){
Area2.setVisible(true);
areaText.setVisible(true);
areaText.setText( (String)e.getItem() );
}
}
//**fim
public void actionPerformed(ActionEvent e)
{
if (e.getSource()==cadastrar)
{
try
{
Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver" );
String cami="jdbc:odbc:conect";
Connection con;
con = DriverManager.getConnection(cami,"","");
Statement stmt;
stmt = con.createStatement();
String SQL = "UPDATE area set area ='+areaText.getText()+' where area='+jComboBox1.getItem()+'";
stmt.executeUpdate(SQL);
stmt.close();
con.close();
areaText.setText("");
}
catch (Exception ex)
{}
}
}
// Variables declaration - do not modify//GEN-BEGIN:variables
private javax.swing.JLabel Area;
private javax.swing.JButton cadastrar;
private javax.swing.JComboBox jComboBox1;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel3;
private javax.swing.JPanel jPanel4;
private javax.swing.JPanel jPanel5;
//*
private javax.swing.JPanel jPanel6;
private javax.swing.JTextField areaText;
private javax.swing.JLabel Area2;
//*
// End of variables declaration//GEN-END:variables
}
