What is null safe way to convert array to string using Thymeleaf

Question

I'm trying to convert String array to String using Thymeleaf.

th:value="${#strings.arrayJoin(result.param.searchCondition.mstoneIds, ',')}"

The problem, that if my array is null I get an exception. Are there any null safe ways to convert Array to String? Thanks.

Answer 1

You could do a conditional check like this

th:value="${result.param.searchCondition.mstoneIds != null} ? ${#strings.arrayJoin(result.param.searchCondition.mstoneIds, ',')} : 'null value'"