Problemas com JDBC

Galera,

Estou usando JDBC na minha aplicação. Estou usando C3PO para controlar as minhas conexoes, mas nao estya adiantando, esta dando o seguinte erro:

** BEGIN NESTED EXCEPTION ** 

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException
MESSAGE: Communications link failure

Last packet sent to the server was 945211 ms ago.

STACKTRACE:

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

Last packet sent to the server was 945211 ms ago.
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
	at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
	at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3246)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1917)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2060)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2536)
	at com.mysql.jdbc.ConnectionImpl.unsetMaxRows(ConnectionImpl.java:5349)
	at com.mysql.jdbc.StatementImpl.realClose(StatementImpl.java:2258)
	at com.mysql.jdbc.ConnectionImpl.closeAllOpenStatements(ConnectionImpl.java:1472)
	at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4254)
	at com.mysql.jdbc.ConnectionImpl.cleanup(ConnectionImpl.java:1248)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2569)
	at com.mysql.jdbc.StatementImpl.executeSimpleNonQuery(StatementImpl.java:1463)
	at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1365)
	at com.mchange.v2.c3p0.impl.NewProxyStatement.executeQuery(NewProxyStatement.java:35)
	at br.com.ces.frotaweb.dao.DaoPrincipal.realizarPesquisas(DaoPrincipal.java:266)
	at br.com.ces.frotaweb.dao.DaoPrincipal.realizarPesquisa(DaoPrincipal.java:249)
	at br.com.ces.frotaweb.dao.UsuarioDao.logarUsuario(UsuarioDao.java:58)
	at br.com.ces.frotaweb.server.FrotaWebServiceImpl.logarUsuario(FrotaWebServiceImpl.java:56)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:616)
	at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569)
	at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)
	at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
	at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
	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:240)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
	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:563)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:399)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:317)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:204)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:182)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:311)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:636)
Caused by: java.net.SocketException: Broken pipe
	at java.net.SocketOutputStream.socketWrite0(Native Method)
	at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:109)
	at java.net.SocketOutputStream.write(SocketOutputStream.java:153)
	at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
	at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
	at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3227)
	... 43 more


** END NESTED EXCEPTION **

Meu codigo C3PO

package br.com.ces.frotaweb.banco;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

import com.mchange.v2.c3p0.ComboPooledDataSource;

import br.com.ces.frotaweb.constantes.ConstanteBanco;
import br.com.ces.frotaweb.exception.FrotaWebException;
import br.com.ces.frotaweb.logger.WebFrotaLogger;

public class ConexaoBanco {

	private static Connection conexaoPrincipal = null;

	public ConexaoBanco() throws FrotaWebException {
	}

	public synchronized static Connection getConexaoServidorFrota()
			throws FrotaWebException {
		if (conexaoPrincipal == null) {
			conexaoPrincipal = iniciarConexaoPrincipal();
		}
		if (conexaoPrincipal != null) {
			try {
				if (conexaoPrincipal.isClosed()) {
					conexaoPrincipal = iniciarConexaoPrincipal();
				}
			} catch (Exception e) {
				throw new FrotaWebException(e);
			}
		}
		return conexaoPrincipal;
	}

	private synchronized static Connection iniciarConexaoPrincipal()
			throws FrotaWebException {
		Connection connection = null;
		try {
			ComboPooledDataSource cpds = new ComboPooledDataSource();
			cpds.setDriverClass(ConstanteBanco.DRIVER_CONEXAO);
			cpds.setJdbcUrl(ConstanteBanco.URL_DE_CONEXAO);
			cpds.setUser(ConstanteBanco.NOME_USUARIO);
			cpds.setPassword(ConstanteBanco.SENHA_USUARIO);
			cpds.setMaxPoolSize(100);
			cpds.setMinPoolSize(10);
			cpds.setAcquireIncrement(1);
			cpds.setIdleConnectionTestPeriod(300);
			cpds.setMaxStatements(20);
			//cpds.setCheckoutTimeout(100);
			connection = cpds.getConnection();
		} catch (Exception e) {
			throw new FrotaWebException(e);
		}

		return connection;
	}

	public synchronized static void close(ResultSet o) {
		try {
			if (o != null) {
				o.close();
			}
		} catch (Exception e) {
			WebFrotaLogger.logError("Erro", e);
		}
	}

	public synchronized static void close(Statement o) {
		try {
			if (o != null) {
				o.close();
			}
		} catch (Exception e) {
			WebFrotaLogger.logError("Erro", e);
		}
	}

	public synchronized static void close(Connection o) {
		try {
			if (o != null) {
				o.close();
			}
		} catch (Exception e) {
			WebFrotaLogger.logError("Erro", e);
		}
	}
}

Não sei mais o que fazer. Passa um tempo não consigo mais logar no sistema. Estou usando GWT + Tomcat

Att

Alguem???