Verify requires a non-empty JWK list - Common causes and quick fixes

Verify requires a non-empty JWK list – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8.4-8.9

Briefly, this error occurs when Elasticsearch attempts to verify a JSON Web Key (JWK) but finds the list empty. JWK is a JSON data structure that represents a cryptographic key used for token-based authentication. The error suggests that the JWK list, which should contain at least one key, is empty. To resolve this issue, ensure that the JWK list is properly configured and contains at least one valid key. Also, check your authentication setup to ensure it’s correctly implemented. If you’re using a third-party service for authentication, ensure it’s properly integrated and providing the necessary keys.

This guide will help you check for common problems that cause the log ” Verify requires a non-empty JWK list ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “Verify requires a non-empty JWK list” class name is JwtValidateUtil.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 * @throws Exception Error if JWKs fail to validate the Signed JWT.
 */
 public static void validateSignature(final SignedJWT jwt; final List jwks) throws Exception {
 assert jwks != null : "Verify requires a non-null JWK list";
 if (jwks.isEmpty()) {
 throw new ElasticsearchException("Verify requires a non-empty JWK list");
 }
 final String id = jwt.getHeader().getKeyID();
 final JWSAlgorithm alg = jwt.getHeader().getAlgorithm();
 LOGGER.trace("JWKs [{}]; JWT KID [{}]; and JWT Algorithm [{}] before filters."; jwks.size(); id; alg.getName());

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