org.hibernate.exception.GenericJDBCException: Cannot open connection

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org.hibernate.exception.GenericJDBCException: Cannot open connection
at org.hibernate.exception.ErrorCodeConverter.handledNonSpecificException(ErrorCodeConverter.java:92)
at org.hibernate.exception.ErrorCodeConverter.convert(ErrorCodeConverter.java:80)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
at org.hibernate.jdbc.AbstractBatcher.openConnection(AbstractBatcher.java:419)
at org.hibernate.jdbc.JDBCContext.connect(JDBCContext.java:145)
at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:91)
at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:74)
at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:67)
at org.hibernate.jdbc.AbstractBatcher.prepareBatchStatement(AbstractBatcher.java:148)
at org.hibernate.persister.entity.BasicEntityPersister.insert(BasicEntityPersister.java:1848)
at org.hibernate.action.EntityInsertAction.execute(EntityInsertAction.java:46)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:239)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:223)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:274)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:678)
at com.myhibernate.hp.test.EmployeeDetailsClient.main(EmployeeDetailsClient.java:33)

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