Spring Data JPA: How to get default expression from CriteriaBuilder inside Specification | Together Java | Page 1

gray pike Apr 23, 2026, 6:01 PM

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I building a search query for area, whether it's just greater than start bound, lesser than end bound or between them. I am refactoring the method and wrapping if statements inside the single Specification predicate body. Before that an Specification was returned in each if statement.

private Specification<Listing> whereArea(Specification<Listing> spec, ListingSearchDTO dto) {
    return (root, _, builder) -> {
        Path<Integer> area = root.get("apartment").get("area");

        if (dto.getM2From() != null && dto.getM2To() != null)
            return builder.between(area, dto.getM2From(), dto.getM2To());
        if (dto.getM2From() != null)
            return builder.ge(area, dto.getM2From());
        if (dto.getM2To() != null)
            return builder.le(area, dto.getM2To());
        return builder.; // return something here
    };
}

What should I return as the default result? I can't seem to find anything about that in the docs.

ripe cairnBOT Apr 23, 2026, 6:01 PM

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<@&1004656351647117403> please have a look, thanks.

gray pike Apr 23, 2026, 6:04 PM

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The code looked like this before:

private Specification<Listing> whereArea(Specification<Listing> spec, ListingSearchDTO dto) {
    if (dto.getM2From() != null && dto.getM2To() != null)
        return (root, _, builder) -> builder.between(root.get("apartment").get("area"), dto.getM2From(), dto.getM2To());
    if (dto.getM2From() != null)
        return (root, _, builder) -> builder.ge(root.get("apartment").get("area"), dto.getM2From());
    if (dto.getM2To() != null)
        return (root, _, builder) -> builder.le(root.get("apartment").get("area"), dto.getM2To());
    return spec;
}

gray pike Apr 23, 2026, 6:47 PM

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Will this be alright?

return spec.toPredicate(root, query, builder);

gray pike May 10, 2026, 4:25 PM

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Spring Boot: How to get default expression from CriteriaBuilder inside Specification

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Spring Data JPA: How to get default expression from CriteriaBuilder inside Specification

gray pike May 10, 2026, 9:22 PM

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@everyone

left spade May 11, 2026, 4:00 AM

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Give up pinging everyone. Helpers automatically see the posts of tags they've registered interest in.

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Can you imagine how annoying it would be if the entire server got pinged all of the time (for help tags that a portion of the server may not be interested in).

#Spring Data JPA: How to get default expression from CriteriaBuilder inside Specification