如何在jboss中从war文件之外使用persistence.xml加载JPA

<global-modules>
    <module name="javax.persistence.api" slot="main"/>
</global-modules>

<?xml version="1.0" encoding="UTF-8"?>
<module xmlns="urn:jboss:module:1.3" name="javax.persistence.api">
    <resources>
        <resource-root path="javax.persistence-api-2.2.jar"/>
    </resources>
    <dependencies>
        <module name="javax.api"/>
        <module name="javax.transaction.api"/>
    </dependencies>
</module>

import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

public class JpaUtil {
    private static final String PERSISTENCE_UNIT_NAME = "yourPersistenceUnitName";
    private static EntityManagerFactory entityManagerFactory;

    public static EntityManagerFactory getEntityManagerFactory() {
        if (entityManagerFactory == null) {
            entityManagerFactory = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
        }
        return entityManagerFactory;
    }
}