java运行时环境检测到致命错误。。。。不明白为什么？
我的代码如下。这是一个向数据库添加叶子的程序。我发现java运行时环境检测到了致命错误，我不明白为什么。我是Java新手，所以对此我很困惑。有人能告诉我为什么会这样吗？ 我也在上传错误文件。我也试着理解，但找不到错误所在的位置java运行时环境检测到致命错误。。。。不明白为什么？,java,swing,jdbc,oracle10g,Java,Swing,Jdbc,Oracle10g,我的代码如下。这是一个向数据库添加叶子的程序。我发现java运行时环境检测到了致命错误，我不明白为什么。我是Java新手，所以对此我很困惑。有人能告诉我为什么会这样吗？ 我也在上传错误文件。我也试着理解，但找不到错误所在的位置 import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.util.*; import java.lang.String; import java.io.*; import
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.lang.String;
import java.io.*;
import java.sql.*;
public class AddLeave extends JFrame implements ActionListener
{
JFrame frame;
JPanel panel,panel1;
JLabel empid,name1,name2,department,designation;
JTextField txtempid,txtname1,txtname2,txtdepartment,txtdesignation;
JButton find,ok,cancel;
String txtname1_1 = "";
String txtname2_1 = "";
String txtdepartment_1 = "";
String txtdesignation_1 = "";
String txtempid1="";
Connection conn;
public AddLeave()
{
frame=new JFrame("ADD LEAVE");
frame.setLayout(new BorderLayout());
panel=new JPanel();
panel.setLayout(new GridLayout(5,2,5,5));
panel.setBackground(Color.RED);
panel1=new JPanel();
//panel1.setLayout(new GridLayout(1,3,10,10));
panel1.setBackground(Color.GREEN);
empid=new JLabel("Employee Id:");
name1=new JLabel("First Name:");
name2=new JLabel("Last Name:");
department=new JLabel("Department:");
designation=new JLabel("Designation:");
txtempid = new JTextField();
txtname1 = new JTextField();
txtname1.setEditable(false);
txtname2 = new JTextField();
txtname2.setEditable(false);
txtdepartment = new JTextField();
txtdesignation = new JTextField();
txtdesignation.setEditable(false);
find=new JButton("FIND");
find.addActionListener(this);
ok=new JButton("OK");
ok.addActionListener(this);
cancel=new JButton("CANCEL");
cancel.addActionListener(this);
panel.add(empid);
panel.add(txtempid);
panel.add(name1);
panel.add(txtname1);
panel.add(name2);
panel.add(txtname2);
panel.add(department);
panel.add(txtdepartment);
panel.add(designation);
panel.add(txtdesignation);
panel1.add(find);
panel1.add(ok);
panel1.add(cancel);
frame.add(panel,BorderLayout.CENTER);
frame.add(panel1,BorderLayout.SOUTH);
frame.setVisible(true);
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
connect();
}
public void connect()
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
conn=DriverManager.getConnection("jdbc:odbc:demo","system","scott");
}
catch(Exception e)
{
System.out.println("Error : "+e);
}
}
public void actionPerformed(ActionEvent event)
{
Object source= event.getSource();
if(source.equals(find))
{
find();
}
if(source.equals(ok))
{
System.out.println("Leave added");
}
if(source.equals(cancel))
{
System.out.println("Canceled");
}
}
public void find()
{
txtempid1=txtempid.getText();
try
{
if(txtempid1.isEmpty())
{
JOptionPane.showMessageDialog(null,"ID REQUIRED!!!","warning",JOptionPane.WARNING_MESSAGE);
}
else
{
Statement stmt = conn.createStatement();
String query = "SELECT * FROM demo WHERE empid='"+txtempid1+"'";
ResultSet rs = stmt.executeQuery(query);
int foundrec = 0;
while (rs.next())
{
txtname1_1 = rs.getString(2);
txtname2_1 = rs.getString(3);
txtdesignation_1 = rs.getString(4);
foundrec =foundrec+ 1;
}
if(foundrec==1)
{
JOptionPane.showMessageDialog(null,"**Record Found**"," Message",JOptionPane.PLAIN_MESSAGE);
txtname1.setText(txtname1_1);
txtname2.setText(txtname2_1);
txtdesignation.setText(txtdesignation_1);
}
else
{
JOptionPane.showMessageDialog(null,"!!!!EMPLOYEE DOES NOT EXIST!!!!"," ERROR",JOptionPane.ERROR_MESSAGE);
}
}
conn.close();
}
catch(Exception e)
{
System.out.println("Error : "+e);
}
}
public static void main(String[] args)
{
new AddLeave();
}
}