Java signature algorithm is not available for SAML XML-Sig algorithm – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.7-7.15

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your Elasticsearch operation.

Briefly, this error occurs when the Java signature algorithm specified is not compatible with the SAML/XML-Sig algorithm. This could be due to a mismatch in the configuration or the absence of the required algorithm in the Java environment. To resolve this issue, you can either update the Java environment to include the required algorithm or adjust the SAML/XML-Sig configuration to use an algorithm that is available in your current Java environment. Additionally, ensure that the Java Cryptography Extension (JCE) is properly installed and configured.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

This guide will help you check for common problems that cause the log ” Java signature algorithm [{}] is not available for SAML/XML-Sig algorithm [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “Java signature algorithm [{}] is not available for SAML/XML-Sig algorithm [{}]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 Signature sig = Signature.getInstance(javaSigAlgorithm);
 return sig.verify(signatureBytes);
 } catch (NoSuchAlgorithmException e) {
 throw new ElasticsearchSecurityException("Java signature algorithm [{}] is not available for SAML/XML-Sig algorithm [{}]";
 e; javaSigAlgorithm; queryString.sigAlg);
 } catch (InvalidKeyException | SignatureException e) {
 logger.warn(new ParameterizedMessage("Signature verification failed for credential [{}]";
 samlFactory.describeCredentials(new HashSet<>(Collections.singletonList(credential)))); e);
 return false;


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?