Conexão banco de dados + Hibernate Expira

Front-end
#1

Pessoal
Subo a aplicação pro tomcat e quando fica acho que 8h inativo, sem nenhuma operação com o banco de dados a conexão expira e no outro dia não consigo acessar.
Só consigo acessar denovo dando um reload no deploy no tomcat.

Pesquisei e disseram pra configurar um gerenciador de pool conections … baixar o C3PO e configurei assim no hibernate.cfg.xml.

    <property name="c3p0.acquire_increment">1</property> 
<property name="c3p0.idle_test_period">100</property> <!-- seconds --> 
<property name="c3p0.max_size">20</property> 
<property name="c3p0.max_statements">50</property> 
<property name="c3p0.min_size">5</property> 
<property name="c3p0.timeout">1800</property>

Os jars estão incluidos certos aparentemente. Ainda assim o erro persiste.
Tem que fazer alguma outra configuração ?

Abraços

#2 
java.net.SocketException: Broken pipe
	java.net.SocketOutputStream.socketWrite0(Native Method)
	java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:109)
	java.net.SocketOutputStream.write(SocketOutputStream.java:153)
	java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
	java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
	com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3345)
	com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1983)
	com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163)
	com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2618)
	com.mysql.jdbc.ConnectionImpl.commit(ConnectionImpl.java:1654)
	org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doCommit(JdbcTransaction.java:112)
	org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:178)
	br.com.caelum.vraptor.plugin.hibernate4.HibernateTransactionInterceptor.intercept(HibernateTransactionInterceptor.java:35)
	br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:56)
	br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	br.com.caelum.vraptor.interceptor.InstantiateInterceptor.intercept(InstantiateInterceptor.java:48)
	br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	br.com.caelum.vraptor.interceptor.FlashInterceptor.intercept(FlashInterceptor.java:83)
	br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor.intercept(ExceptionHandlerInterceptor.java:71)
	br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:56)
	br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	br.com.caelum.vraptor.interceptor.ResourceLookupInterceptor.intercept(ResourceLookupInterceptor.java:69)
	br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	br.com.caelum.vraptor.core.EnhancedRequestExecution.execute(EnhancedRequestExecution.java:44)
	br.com.caelum.vraptor.VRaptor$1.insideRequest(VRaptor.java:92)
	br.com.caelum.vraptor.ioc.spring.SpringProvider.provideForRequest(SpringProvider.java:58)
	br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:89)

Alguém pode dar alguma luz ai ?

#3