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org.hibernate.exception.JDBCConnectionException: Cannot open connection


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Stack Trace:

javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: Cannot open connection

   em org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:614)
   em org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:41)
   em br.edu.ifpi.dao.TransacaoBD.iniciaTransacao(TransacaoBD.java:50)
   em br.edu.ifpi.filtros.EntityManagerFilter.doFilter(EntityManagerFilter.java:55)
   em org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
   em org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   em org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
   em org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
   em org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)
   em org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
   em org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
   em org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)
   em org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
   em org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
   em org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1137)
   em org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
   em org.apache.tomcat.util.net.AprEndpoint$SocketWithOptionsProcessor.run(AprEndpoint.java:2492)
   em java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1152)
   em java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:622)
   em org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
   em java.lang.Thread.run(Thread.java:748)