EntityManagerFactory emf = Persistence.createEntityManagerFactory("helloworld");
//getHelloWorldPersistenceProvider();
EntityManager em = null;
try {
emf.createEntityManager();
} catch (Exception e){
e.printStackTrace();
}
<persistence 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"
version="1.0">
<persistence-unit name="helloworld">
<!-- needs only to be set if you use several jpa providers -->
<!-- <provider>org.hibernate.ejb.HibernatePersistence</provider> -->
<!-- <class>org.hec.Message</class> -->
<properties>
<property name="hibernate.archive.autodetection" value="class, hbm"/>
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.format_sql" value="true"/>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/Messages"/>
<property name="hibernate.connection.username" value="hibernate_user"/>
<property name="hibernate.connection.password" value="zoom"/>
<property name="hibernate.c3p0.min_size" value="5"/>
<property name="hibernate.c3p0.max_size" value="20"/>
<property name="hibernate.c3p0.max_statements" value="50"/>
<property name="hibernate.c3p0.timeout" value="300"/>
<property name="hibernate.c3p0.idle_test_period" value="3000"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
<!-- <property name="hibernate.hbm2ddl.auto" value="create"/> -->
</properties>
</persistence-unit>
</persistence>
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