checkEntityList of billy-core-jpa needs improvement

[ajcamilo]

checkEntityList on com.premiumminds.billy.core.persistence.dao.jpa.AbstractDAO of billy-core-jpa needs improvement, because it's creating a new list with all the elements just to resolve a cast issue.

billy/billy-core-jpa/src/main/java/com/premiumminds/billy/persistence/dao/jpa/AbstractDAO.java

Lines 111 to 124 in aa93a90

	protected <T2 extends Entity> List<T2> checkEntityList(List<?> candidates, Class<T2> entityClass) {
	if (candidates == null) {
	return null;
	}
	List<T2> result = new ArrayList<>();
	for (Object candidate : candidates) {
	if (!entityClass.isInstance(candidate)) {
	throw new RuntimeException(
	"The entity is not a JPA implementation : " + candidate.getClass().getCanonicalName());
	}
	result.add((T2) candidate);
	}
	return result;
	}