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org.hibernate.TransactionException: JDBC begin failed:


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Stack Trace:

javax.persistence.PersistenceException: org.hibernate.TransactionException: JDBC begin failed:

   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:243)
   em org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
   em org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
   em org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
   em org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
   em org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
   em com.googlecode.psiprobe.Tomcat70AgentValve.invoke(Tomcat70AgentValve.java:38)
   em org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
   em org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
   em org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
   em org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
   em org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
   em org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
   em org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
   em java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
   em java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
   em java.lang.Thread.run(Thread.java:744)