quarkusio/quarkus · warning · BadRequestException

Before and after name lengths do not match

Error message

Before and after name lengths do not match

What it means

This REST resource method renames entities by pairing each 'before' name with an 'after' name positionally. If the two query-parameter arrays differ in length, no valid pairing exists, so a BadRequestException (400) is thrown by design.

Source

Thrown at integration-tests/hibernate-orm-data/src/main/java/io/quarkus/it/hibernate/processor/data/security/SecuredMyEntityResource.java:183

    }

    @Path("/insert-all-1")
    @POST
    @Transactional
    public void insertAll1(MyEntity entity) {
        repository.insertAll1(List.of(entity));
    }

    @Path("/insert-all-2")
    @POST
    @Transactional
    public void insertAll2(MyEntity entity) {
        repository.insertAll2(List.of(entity));
    }

    private List<MyEntity> loadAndRenameEntities(@RestQuery String[] before, @RestQuery String[] after) {
        if (before.length != after.length) {
            throw new BadRequestException("Before and after name lengths do not match");
        }
        MyEntity[] entities = new MyEntity[before.length];
        for (int i = 0; i < before.length; i++) {
            entities[i] = getByName(before[i]);
            entities[i].name = after[i];
        }
        return Arrays.asList(entities);
    }

    @PermissionChecker("find-for-donald")
    boolean canFindForDonald(SecurityIdentity ignored) {
        // grant permission "find-for-donald" if user requested it via header
        return "find-for-donald".equals(httpHeaders.getHeaderString("dynamic-permission"));
    }
}

View on GitHub (pinned to e1c734241f)

Solutions

1. Make the before and after query arrays the same length
2. Check for empty values being dropped (e.g. 'a,,b' splitting) in your client
3. Inspect the actual request URL logged by the test/server to see the parsed arrays

Example fix

// before
GET /rename?before=a,b&after=x
// after
GET /rename?before=a,b&after=x,y

if (before.length != after.length) throw new IllegalArgumentException("before/after arrays must have equal length");

try { rename(before, after); } catch (BadRequestException e) { log.warn("Rename rejected: {}", e.getMessage()); }

When it happens

Trigger: Calling loadAndRenameEntities via the rename endpoints (renameAllPermissions1And2, renameAllPermissions2And3, renameOverloadedSecured) with ?before=a,b&after=x (mismatched counts).

Common situations: Manually constructing the query string and forgetting a value, programmatic clients joining arrays with commas where an element is dropped, or URL encoding swallowing an empty value.

Related errors

• Extra steps left over
• Unknown start character for json value: %s
• invalid char value: " + str
• invalid Character value:
• Should provide name or color query parameter

AI-assisted analysis of quarkusio/quarkus@e1c734241f (2026-09-05). Data as JSON: /api/errors/c647877da69a393d. Report an issue: GitHub.