[RESOLVIDO] Erro na hora de conectar com o Banco de Dados

Front-end
#1

Olá galera…
Estou com um pequeno problema no meu projeto…

Criei todo o código, estava funcionando normalmente, e agora ele não conecta mais ao banco de dados.
Será que conseguem me ajudar?
Vou postar o código e o stacktrace pra vocês.

Código

package br.com.weblibrary.utils;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;

public final class DBUtils {

	private DBUtils() {
	}

	public static Connection getConnection() {
		String url = "jdbc:mysql://localhost/LivrariaWeb";
		String user = "root";
		String pass = "";
		
		try {
			Class.forName("com.mysql.jdbc.Driver");
			return DriverManager.getConnection(url, user, pass);
		} catch (SQLException ex) {
			Logger.getLogger(DBUtils.class.getName()).log(Level.SEVERE, null,
					ex);
		} catch (ClassNotFoundException ex) {
			Logger.getLogger(DBUtils.class.getName()).log(Level.SEVERE, null,
					ex);
		}
		return null;
	}

	public static int executeUpdate(Connection con, String sql) {
		Statement stmt = null;
		
		try {
			stmt = con.createStatement();
			return stmt.executeUpdate(sql);
		} catch (SQLException ex) {
			Logger.getLogger(DBUtils.class.getName()).log(Level.SEVERE, null,
					ex);
		} finally {
			closeStatement(stmt);
		}
		return 0;
	}

	public static ResultSet executeQuery(Connection con, String sql) {
		Statement stmt = null;
		
		try {
			stmt = con.createStatement();
			return stmt.executeQuery(sql);
		} catch (SQLException ex) {
			Logger.getLogger(DBUtils.class.getName()).log(Level.SEVERE, null,
					ex);
		}
		return null;
	}

	public static void closeResultSet(ResultSet rs) {
		
		try {
			if (rs != null) {
				rs.close();
			}
		} catch (SQLException ex) {
		}
		rs = null;
	}

	public static void closeStatement(Statement stmt) {
		
		try {
			if (stmt != null) {
				stmt.close();
			}
		} catch (SQLException ex) {
		}
		stmt = null;
	}

	public static void closeConnection(Connection con) {
		
		try {
			if (con != null) {
				con.close();
			}
		} catch (SQLException ex) {
		}
		con = null;
	}
}

Stacktrace


java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Unknown Source)
	at br.com.weblibrary.utils.DBUtils.getConnection(DBUtils.java:22)
	at org.apache.jsp.estado_jsp._jspService(estado_jsp.java:123)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:279)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
03/11/2011 09:38:57 org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() for servlet [jsp] in context with path [/WebLibrary] threw exception [An exception occurred processing JSP page /estado.jsp at line 60

57: 	} else if (btnLocate != null) {
58: 		Connection con = DBUtils.getConnection();
59: 		EstadosDAO dao = new EstadosDAO(con);
60: 		EstadoDTO dto = dao.locate(txtSigla);
61: 		if (dto != null) {
62: 			out.println("Estado localizado com sucesso!");
63: 			txtSigla = dto.getIdEstado();


Stacktrace:] with root cause
java.lang.NullPointerException
	at br.com.weblibrary.utils.DBUtils.executeQuery(DBUtils.java:53)
	at br.com.weblibrary.dao.EstadosDAO.locate(EstadosDAO.java:38)
	at org.apache.jsp.estado_jsp._jspService(estado_jsp.java:125)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:279)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

Não contém nenhum erro na compilação, mas acontece esse erro ai quando eu tento fazer busca, inserir ou deletar algum dado do banco.
Eu uso o Tomcat 7.0

Obrigado

#2

cara,

esse erro acontece pq vc nao colocou o jar do mysql no tomcat.

t+

#3

Nossa, eu nunca imaginei que poderia ser isso!
Era só pegar o jar do mysql e colar dentro da pasta lib do tomcat.

Obrigado Alisson!
Agora rodou certo!

#4

boa… :lol:
marque o post como resolvido.

t+

#5