object/src/main/java/com/orientechnologies/orient/object/jpa/parsing/PersistenceXmlUtil.java
public static PersistenceUnitInfo findPersistenceUnit(String unitName, Collection<? extends PersistenceUnitInfo> units) {
    if (units == null || unitName == null) {
      return null;
    }

    for (PersistenceUnitInfo unit : units) {
      if (unitName.equals(unit.getPersistenceUnitName())) {
        return unit;
      }
    }
    return null;
  }
public static PersistenceUnitInfo findPersistenceUnit(String unitName, Collection<? extends PersistenceUnitInfo> units) {
    if (units == null || unitName == null) {
      return null;
    }

    for (PersistenceUnitInfo unit : units) {
      if (unitName.equals(unit.getPersistenceUnitName())) {
        return unit;
      }
    }
    return null;
  }
Parse the persistence.xml files referenced by the URLs in the collection

@param persistenceXml
@return A collection of parsed persistence units, or null if nothing has been found