认证方法

Question

我创建了一个登录类，但我仍然有一个零点异常错误消息，我无法了解他的来源请帮助我，这是我的代码和消息错误

public boolean Authentification(String user, String password){
boolean result=false;
try {

conn=con.Connect();

stmt = conn.createStatement();

ResultSet  rs=stmt.executeQuery("select * from login  where user ='"+user+"' AND password='"+password+"'"); 

if ( rs.next()) 
result=true;
stmt.close();

conn.close();


}  catch (SQLException e) { 
e.printStackTrace();
}
return result;

}

调用methode

  private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
                // TODO add your handling code here:
                System.out.println("user"+user.getText()+" pass "+password.getText());
                boolean Login =m.Authentification(user.getText(), password.getText());
            } 

错误消息

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at Interfaces.Authentification.jButton1ActionPerformed(Authentification.java:215)
    at Interfaces.Authentification.access$100(Authentification.java:21)
    at Interfaces.Authentification$2.actionPerformed(Authentification.java:84)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)