<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
<!-- oracle -->
<persistence-unit name="oracles" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<class>Estado</class>
<exclude-unlisted-classes>true</exclude-unlisted-classes>
<properties>
  <property name="hibernate.archive.autodetection" value="class"/>
  <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect"/>
  <property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver"/>
  <property name="hibernate.connection.url" value="jdbc:oracle:thin:@192.168.0.68:1521:dbteste"/>
  <property name="hibernate.connection.username" value="teste"/>
  <property name="hibernate.connection.password" value="teste"/>
  <property name="hibernate.show_sql" value="true"/>
  <!-- <property name="hibernate.flushMode" value="FLUSH_AUTO"/> -->
  <property name="hibernate.hbm2ddl.auto" value="update"/>
  <property name="hibernate.c3p0.min_size" value="10"/>
  <property name="hibernate.c3p0.max_size" value="20"/>
  <property name="hibernate.c3p0.idle_test_period" value="1"/>
  <property name="hibernate.c3p0.idle_test_period" value="3000"/>
  <property name="hibernate.c3p0.max_statements" value="50"/>
  <property name="hibernate.c3p0.timeout" value="1800"/>
</properties>

Informações:   HHH000204: Processing PersistenceUnitInfo [
name: oracles
...]