XML element cannot be unmarshalled to SAML type no unmarshaller – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.7-7.15

Briefly, this error occurs when Elasticsearch tries to convert an XML element into a SAML type but fails because it can’t find a suitable unmarshaller. This could be due to incorrect XML structure or missing necessary libraries. To resolve this issue, you can: 1) Check the XML structure for any errors and correct them. 2) Ensure that the necessary libraries for unmarshalling are installed and properly configured. 3) Update your Elasticsearch and SAML configurations to ensure they are compatible.

This guide will help you check for common problems that cause the log ” XML element [{}] cannot be unmarshalled to SAML type [{}] (no unmarshaller) ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “XML element [{}] cannot be unmarshalled to SAML type [{}] (no unmarshaller)” class name is SamlFactory.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 public T buildXmlObject(Element element; Class type) {
 try {
 UnmarshallerFactory unmarshallerFactory = getUnmarshallerFactory();
 Unmarshaller unmarshaller = unmarshallerFactory.getUnmarshaller(element);
 if (unmarshaller == null) {
 throw new ElasticsearchSecurityException("XML element [{}] cannot be unmarshalled to SAML type [{}] (no unmarshaller)";
 element.getTagName(); type);
 final XMLObject object = unmarshaller.unmarshall(element);
 if (type.isInstance(object)) {
 return type.cast(object);


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?