Erro do hibernate

java.sql.SQLException: Connections could not be acquired from the underlying database!

at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:104)

at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:236)

at com.mchange.v2.c3p0.PoolBackedDataSource.getConnection(PoolBackedDataSource.java:94)

at org.hibernate.connection.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:35)

at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:76)

at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2006)

at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1289)

at br.com.sigma.hibernate.SigmaHibernateUtil.inicializar(SigmaHibernateUtil.java:110)

at br.com.sigma.hibernate.SigmaInterceptor.init(SigmaInterceptor.java:34)

at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:225)

at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:308)

at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:79)

at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3563)

at org.apache.catalina.core.StandardContext.start(StandardContext.java:4133)

at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1012)

at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)

at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1012)

at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)

at org.apache.catalina.core.StandardService.start(StandardService.java:450)

at org.apache.catalina.core.StandardServer.start(StandardServer.java:680)

at org.apache.catalina.startup.Catalina.start(Catalina.java:536)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:275)

at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)

Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.

at com.mchange.v2.resourcepool.BasicResourcePool.awaitAcquire(BasicResourcePool.java:970)

at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:208)

at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:232)

… 25 more