in starters/karaf-boot-starter-jpa/src/main/java/org/apache/karaf/boot/jpa/impl/JpaProcessor.java [104:111]
private void addProperties(PersistentUnit pu, Map<String, String> props) {
if (pu.properties() == null) {
return;
}
for (Property property : pu.properties()) {
props.put(property.name(), property.value());
}
}