Im folgenden Code ... bekomme ich keinen passenden Treiber ... Fehler: Bitte helfen Sie. Ich arbeite schon seit einer Stunde damit und kann es nicht herausfinden.

Es ist verrückt Ich war in der Lage, genau das zu tun, bevor ich anfing, mich mit GWT zu beschäftigen.

package com.gwt.churchweb.churchweblogin.client;

import com.google.gwt.user.client.ui.Composite;

import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.CheckBox;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.user.client.Window;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.DriverManager;

import java.util.logging.Level;
import java.util.logging.Logger;

public class Login extends Composite {

    public Login() {

        VerticalPanel verticalPanel = new VerticalPanel();
        initWidget(verticalPanel);
        verticalPanel.setSize("329px", "186px");

        Label lblNewLabel = new Label("Sign into your account");
        lblNewLabel.setStyleName("gwt-Login-SigninLabel");
        verticalPanel.add(lblNewLabel);

        FlexTable flexTable = new FlexTable();
        verticalPanel.add(flexTable);
        flexTable.setWidth("308px");

        Label lblNewLabel_1 = new Label("Username:");
        lblNewLabel_1.setStyleName("gwt-Label-Login");
        flexTable.setWidget(0, 0, lblNewLabel_1);
        lblNewLabel_1.setWidth("72px");

        final TextBox textboxUsername = new TextBox();
        textboxUsername.setStyleName("gwt-LoginTextBox");
        flexTable.setWidget(0, 1, textboxUsername);
        textboxUsername.setWidth("204px");

        Label lblNewLabel_2 = new Label("Password:");
        lblNewLabel_2.setStyleName("gwt-Label-Login");
        flexTable.setWidget(1, 0, lblNewLabel_2);
        lblNewLabel_2.setWidth("66px");

        final TextBox textBoxPassword = new TextBox();
        textBoxPassword.setStyleName("gwt-LoginTextBox");
        flexTable.setWidget(1, 1, textBoxPassword);
        textBoxPassword.setWidth("204px");
        flexTable.getCellFormatter().setHorizontalAlignment(0, 0, HasHorizontalAlignment.ALIGN_LEFT);
        flexTable.getCellFormatter().setHorizontalAlignment(1, 0, HasHorizontalAlignment.ALIGN_LEFT);

        CheckBox chckbxRememberMeOn = new CheckBox("Remember me on this computer");
        chckbxRememberMeOn.setStyleName("gwt-Checkbox-Login");
        flexTable.setWidget(2, 1, chckbxRememberMeOn);

        Button btnSignIn = new Button("Sign In");
        btnSignIn.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                Connection con = null;
                Statement st = null;
                ResultSet rs = null;

                String url = "jdbc:mysql://localhost:3306/churchweb";
                String user = "root";
                String password = "*****";

                try {
                    con = DriverManager.getConnection(url, user, password);
                    st = con.createStatement();
                    rs = st.executeQuery("SELECT VERSION()");
Window.alert("Fixing to try it");
                    if (rs.next()) {
                        Window.alert(rs.getString(1));
                    }

                } catch (SQLException ex) {
                    Logger lgr = Logger.getLogger(Login.class.getName());
                    lgr.log(Level.SEVERE, ex.getMessage(), ex);

                } finally {
                    try {
                        if (rs != null) {
                            rs.close();
                        }
                        if (st != null) {
                            st.close();
                        }
                        if (con != null) {
                            con.close();
                        }

                    } catch (SQLException ex) {
                        Logger lgr = Logger.getLogger(Login.class.getName());
                        lgr.log(Level.WARNING, ex.getMessage(), ex);
                    }
                }





                if (textboxUsername.getText().length() == 0
                        || textBoxPassword.getText().length() == 0) {
                        Window.alert("Username or password is empty."); 
                    }
            }
        });

        btnSignIn.setStyleName("gwt-Login-SigninButton");
        flexTable.setWidget(3, 1, btnSignIn);

    }


}