Aplicação web java + hibernate + spring encerrando a conexão do Banco de Dados após algumas horas

Bom dia, coloquei minha aplicação web no servidor integrator para que ficasse online, porém após umas 8h com o servidor apache tomcat startado a aplicação corta a conexão com o banco de dados, sei que deve ser alguma falta de configuração do hibernate.
Meu spring-servlet está da seguinte forma:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx"

	xsi:schemaLocation="
	 	http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
	    http://www.springframework.org/schema/mvc 
		http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
		http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
		http://www.springframework.org/schema/context
		http://www.springframework.org/schema/context/spring-context-3.0.xsd">



	<context:component-scan base-package="br.com.flashconcursos" />
	<mvc:annotation-driven />


	<mvc:interceptors>
 		<bean class="br.com.flashconcursos.interceptor.AutorizadorInterceptor"/>
 	</mvc:interceptors>


	<bean id="viewResolver"
		class="org.springframework.web.servlet.view.UrlBasedViewResolver">
		<property name="viewClass">
			<value>
				org.springframework.web.servlet.view.tiles2.TilesView
			</value>
		</property>
	</bean>
	<bean id="tilesConfigurer"
		class="org.springframework.web.servlet.view.tiles2.TilesConfigurer">
		<property name="definitions">
			<list>
				<value>/WEB-INF/tiles.xml</value>
			</list>
		</property>
	</bean>

	<bean
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/" />
		<property name="suffix" value=".jsp" />
	</bean>


	<bean id="sessionFactory"
		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.connection.url">jdbc:mysql://localhost/flashconcursos</prop>
				<prop key="hibernate.connection.driver_class">com.mysql.jdbc.Driver</prop>
				<prop key="hibernate.connection.username">root</prop>
				<prop key="hibernate.connection.password">admin</prop>
				<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
				<prop key="hibernate.show_sql">true</prop>
				<prop key="hibernate.format_sql">true</prop>
				<prop key="hibernate.hbm2ddl.auto">update</prop>
			</props>
		</property>
		<property name="annotatedClasses">
			<list>
				<value>br.com.flashconcursos.modelo.Usuario</value>
				<value>br.com.flashconcursos.modelo.Disciplina</value>
				<value>br.com.flashconcursos.modelo.Cartao</value>
				<value>br.com.flashconcursos.modelo.Objetivo</value>
				<value>br.com.flashconcursos.modelo.Atividade</value>
				<value>br.com.flashconcursos.modelo.Plano</value>
				<value>br.com.flashconcursos.modelo.PlanoDisciplina</value>
				
			</list>
		</property>
	</bean>

	<bean id="transactionManager"
		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory"></property>
	</bean>
	<tx:annotation-driven />


	<bean id="conversionService"
		class="org.springframework.context.support.ConversionServiceFactoryBean">
		<property name="converters">
			<list>
				<bean
					class="br.com.flashconcursos.utilitarios.StringToEnumConverterFactory" />
			</list>
		</property>
	</bean>


</beans>

E essa é a mensagem de erro ao tentar realizar qualquer operação que envolva conexão com o banco de dados após ficar várias horas startado:

HTTP Status 500 - Request processing failed; nested exception is org.springframework.transaction.TransactionSystemException: Could not roll back Hibernate transaction; nested exception is org.hibernate.TransactionException: JDBC rollback failed

type Exception report

message Request processing failed; nested exception is org.springframework.transaction.TransactionSystemException: Could not roll back Hibernate transaction; nested exception is org.hibernate.TransactionException: JDBC rollback failed

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.transaction.TransactionSystemException: Could not roll back Hibernate transaction; nested exception is org.hibernate.TransactionException: JDBC rollback failed
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:659)
	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:563)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

org.springframework.transaction.TransactionSystemException: Could not roll back Hibernate transaction; nested exception is org.hibernate.TransactionException: JDBC rollback failed
	org.springframework.orm.hibernate3.HibernateTransactionManager.doRollback(HibernateTransactionManager.java:679)
	org.springframework.transaction.support.AbstractPlatformTransactionManager.processRollback(AbstractPlatformTransactionManager.java:845)
	org.springframework.transaction.support.AbstractPlatformTransactionManager.rollback(AbstractPlatformTransactionManager.java:822)
	org.springframework.transaction.interceptor.TransactionAspectSupport.completeTransactionAfterThrowing(TransactionAspectSupport.java:393)
	org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:114)
	org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
	org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
	com.sun.proxy.$Proxy28.existeUsuario(Unknown Source)
	br.com.flashconcursos.controller.UsuarioController.efetuaLogin(UsuarioController.java:51)
	br.com.flashconcursos.controller.UsuarioController$$FastClassByCGLIB$$7e840752.invoke(<generated>)
	net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191)
	org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621)
	br.com.flashconcursos.controller.UsuarioController$$EnhancerByCGLIB$$fe692847.efetuaLogin(<generated>)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:497)
	org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:710)
	org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:167)
	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:414)
	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:402)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:771)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647)
	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:563)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

org.hibernate.TransactionException: JDBC rollback failed
	org.hibernate.transaction.JDBCTransaction.rollback(JDBCTransaction.java:204)
	org.springframework.orm.hibernate3.HibernateTransactionManager.doRollback(HibernateTransactionManager.java:676)
	org.springframework.transaction.support.AbstractPlatformTransactionManager.processRollback(AbstractPlatformTransactionManager.java:845)
	org.springframework.transaction.support.AbstractPlatformTransactionManager.rollback(AbstractPlatformTransactionManager.java:822)
	org.springframework.transaction.interceptor.TransactionAspectSupport.completeTransactionAfterThrowing(TransactionAspectSupport.java:393)
	org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:114)
	org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
	org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
	com.sun.proxy.$Proxy28.existeUsuario(Unknown Source)
	br.com.flashconcursos.controller.UsuarioController.efetuaLogin(UsuarioController.java:51)
	br.com.flashconcursos.controller.UsuarioController$$FastClassByCGLIB$$7e840752.invoke(<generated>)
	net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191)
	org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621)
	br.com.flashconcursos.controller.UsuarioController$$EnhancerByCGLIB$$fe692847.efetuaLogin(<generated>)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:497)
	org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:710)
	org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:167)
	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:414)
	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:402)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:771)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647)
	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:563)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException: Connection.close() has already been called. Invalid operation in this state.
	com.mysql.jdbc.SQLError.createSQLException(SQLError.java:888)
	com.mysql.jdbc.Connection.getMutex(Connection.java:3755)
	com.mysql.jdbc.Connection.rollback(Connection.java:5251)
	org.hibernate.transaction.JDBCTransaction.rollbackAndResetAutoCommit(JDBCTransaction.java:217)
	org.hibernate.transaction.JDBCTransaction.rollback(JDBCTransaction.java:196)
	org.springframework.orm.hibernate3.HibernateTransactionManager.doRollback(HibernateTransactionManager.java:676)
	org.springframework.transaction.support.AbstractPlatformTransactionManager.processRollback(AbstractPlatformTransactionManager.java:845)
	org.springframework.transaction.support.AbstractPlatformTransactionManager.rollback(AbstractPlatformTransactionManager.java:822)
	org.springframework.transaction.interceptor.TransactionAspectSupport.completeTransactionAfterThrowing(TransactionAspectSupport.java:393)
	org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:114)
	org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
	org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
	com.sun.proxy.$Proxy28.existeUsuario(Unknown Source)
	br.com.flashconcursos.controller.UsuarioController.efetuaLogin(UsuarioController.java:51)
	br.com.flashconcursos.controller.UsuarioController$$FastClassByCGLIB$$7e840752.invoke(<generated>)
	net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191)
	org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621)
	br.com.flashconcursos.controller.UsuarioController$$EnhancerByCGLIB$$fe692847.efetuaLogin(<generated>)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:497)
	org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:710)
	org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:167)
	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:414)
	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:402)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:771)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647)
	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:563)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.62 logs.

Apache Tomcat/7.0.62