persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0"
    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_2_0.xsd">
    <persistence-unit name="TodoJPA" transaction-type="JTA">
    	<jta-data-source>java:jboss/datasources/todo</jta-data-source>     	   	
       	<class>com.todo.entity.User</class>
        <class>com.todo.entity.Category</class>
        <class>com.todo.entity.Todo</class>
        <properties>
			<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
            <property name="hibernate.show_sql" value="true"></property>
            <property name="hibernate.hbm2ddl.auto" value="update"></property>
 		</properties>
    </persistence-unit>
</persistence>