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KB-XXXX "Unexpected element '{urn:jboss:domain:1.8}server" error on startup

Symptoms

While starting Appian, JBoss fails to start due to the following error in the server.log file located in <JBOSS_HOME>/standalone/logs

ERROR [org.jboss.as.server] (Controller Boot Thread) JBAS015956: Caught exception during boot: org.jboss.as.controller.persistence.ConfigurationPersistenceException: JBAS014676: Failed to parse configuration
...
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[3,1] Message: Unexpected element '{urn:jboss:domain:1.8}server'

Cause

This error occurs when the JBoss version is not supported by Appian. The minimum version of JBoss that is supported is 6.4.14. 

Action

Download JBoss EAP 6.4 (6.4.14 or later) and start Appian again. 

Affected Versions

This article applies to Appian 18.2 and earlier.

Last Reviewed: August 2019