Erro na conexão com o Banco MYSQL

<strong>Segue o erro:</strong>

GRAVE: Servlet.service() for servlet [br.com.servlet.controller.UserLogar] in context with path [/SistemaJavaWeb] threw exception

java.lang.RuntimeException: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

at br.com.factory.mysql.ConexaoMysql.getConnection(ConexaoMysql.java:26)

at br.com.DAO.UsuarioDAO.(UsuarioDAO.java:15)

at br.com.servlet.controller.UserLogar.doPost(UserLogar.java:42)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:165)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)

at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:452)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1195)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:654)

at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:319)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Thread.java:748)

Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1951)

at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1794)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:264)

at br.com.factory.mysql.ConexaoMysql.getConnection(ConexaoMysql.java:20)

… 24 more

SEGUE O CóDIGO DO SERVLET:

protected void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

// TODO Auto-generated method stub

doGet(request, response);

// classe Login Sistemas

LoginSistema loginSis = new LoginSistema();

String userLogin = request.getParameter(“txtUser”);

String passLogin = request.getParameter(“txtPass”);

loginSis.setUser_login(userLogin);
	loginSis.setPass_login(passLogin);

	RequestDispatcher rd = null;
	UsuarioDAO userDao = new UsuarioDAO();

	if (userDao.verificarUsuario(loginSis)) {
		HttpSession sessao = request.getSession();
		sessao.setAttribute("sessaoUser", userLogin);
		rd = request.getRequestDispatcher("/index-principal.jsp");
		rd.forward(request, response);

	} else {
		request.setAttribute("mensagem", "Usuario ou senha inválidos");
		rd = request.getRequestDispatcher("/index.jsp");
		rd.forward(request, response);

	}

}

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

// ESSA CONEXÃO ESTÁ FUNCIONANDO COM O BANCO DE DADOS

public class ConexaoMysql {

private String URL = “jdbc:mysql://127.0.0.1/aulajpa”;

private String USER = “root”;

private String PASS = “root”;

private String DRIVER = “com.mysql.jdbc.Driver”;

public Connection getConnection() {
	try {
		Class.forName(DRIVER);
		return DriverManager.getConnection(URL, USER, PASS);
	} catch (SQLException erro) {

		throw new RuntimeException(erro);
	} catch (ClassNotFoundException erro) {
		throw new RuntimeException(erro);
	}

}

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.logging.Level;

import com.sun.istack.internal.logging.Logger;

import br.com.factory.mysql.ConexaoMysql;

import br.com.javaBean.model.LoginSistema;

public class UsuarioDAO {

private Connection conn;

public UsuarioDAO() {

this.conn = new ConexaoMysql().getConnection();

}

// método valida acesso
public boolean verificarUsuario(LoginSistema user) {
	// if(this.user_login != null && this.pass_login != null) {
	// if(this.user_login.equals("iso0406") && this.pass_login.equals("046284"))
	// return true;
	// }

	String sql = "SELECT * FROM login WHERE login=? AND senha=?";
	try {
		PreparedStatement ps = conn.prepareStatement(sql);
		ps.setString(1, user.getUser_login());
		ps.setString(2, user.getPass_login());
		ResultSet rs = ps.executeQuery();
		if (rs.next())
			return true;

	} catch (SQLException erro) {	
		Logger.getLogger(UsuarioDAO.class.getName(), null).log(Level.SEVERE, null, erro);
	}
	return false;
}