Multiple calls to same getter, maybe use a variable

poi.getUrl() called 3 times at L14 and 15, and the getter has an If, it's not a simple property fetch

wikivoyage-listings/src/main/java/org/wikivoyage/listings/validators/WebsiteURLValidator.java

Line 14 in 7d2abc7

if (poi.getUrl() != null && !poi.getUrl().equals("")) {

Just a minor gripe, I didn't find a Discussion place for this, and pretty sure this won't be high priority and optimization will come really late in the timeline, so feel free to delete this issue.
Other files have this, too:

wikivoyage-listings/src/main/java/org/wikivoyage/listings/validators/EmailValidator.java

Line 8 in 7d2abc7

if (poi.getEmail() != null && !poi.getEmail().equals("")) {

and Line 9

Thanks!
Feel free to send a pull request :-)