org.hibernate.exception.GenericJDBCException: Cannot open connection
	at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
	at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
	at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
	at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
	at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:426)
	at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144)
	at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:139)
	at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1547)
	at org.hibernate.loader.Loader.doQuery(Loader.java:673)
	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
	at org.hibernate.loader.Loader.doList(Loader.java:2220)
	at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
	at org.hibernate.loader.Loader.list(Loader.java:2099)
	at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:94)
	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1569)
	at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:283)
	at com.depthfirst.dola.web.activity.manager.KnowledgeManager.searchKnowledge(KnowledgeManager.java:37)
	at com.depthfirst.dola.web.activity.servlet.KnowledgeServlet.service(KnowledgeServlet.java:58)
	at com.depthfirst.dola.web.util.WebServlet.service(WebServlet.java:64)
	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:225)
	at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:127)
	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:272)
	at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
	at com.depthfirst.dola.web.filter.ThaiLocalAdminFilter.doFilter(ThaiLocalAdminFilter.java:37)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
	at test.LoggerFilter.doFilter(LoggerFilter.java:52)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
	at com.depthfirst.filter.MultipartServletFilter.doFilter(MultipartServletFilter.java:50)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
	at com.depthfirst.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:28)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3151)
	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
	at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
	at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:1973)
	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1880)
	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1310)
	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:207)
	at weblogic.work.ExecuteThread.run(ExecuteThread.java:179)
Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!
	at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:529)
	at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
	at org.hibernate.connection.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:56)
	at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:423)
	... 35 more
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.awaitAvailable(BasicResourcePool.java:1319)
	at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)
	at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)
	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)
	... 38 more